123 
NOTES ON ACARI. 
Fifth Series. ') 
BY 
Dr. A. C. O U D E M A N S. 
(With Plates 10— it2.) 
1. Acari of Russia. 
The Argus reflexiis (Fab.), mentioned in the Tijihchnft voor 
Entomologìe , vol. 4-3, p. 112, a.s found in 1879 by Dr. A. R. 
Spoof in a farmer's dwelling in the Russian village Ssamjâni , 
near Astrachan, is determined by Prof. G. Neumann, of Toulouse, 
as Arg as persicus Fischer, with a ? 
The following Acari were collected by Dr. A. R. Spoof near 
OAbo, Finland, 1897—1900. 
Parasitus cr assises (L.), Î. 
Uropoda ovalls (G. L. Koch), 2 nymphae, 1 $. Under chips 
on the sea-shore, July, 1897. 
Tydeus croceus (L.) , 1 ex. On Prunus padns L. , Sept., 1900. 
Linopodes motatorius (L.) , 1 ex. 
1) The First Series appeared 15, I, 1897 iu the Tijdschr. v. Entom. vol. 
39, p. 175-187. 
The Second Series 5, IX, 1900 in the Tijdschr. v. Entom., vol. 43, p. 109— 128. 
The Third Series 30, XI, 1901 in the Tijdschr. d. Ned. Dierk. Vereen, ser. 
2, vol. 7, p. 50 87. 
The Fourth Series IS, VII, 1902 in the Tijdschr. d. Ned. Dierk. Veieeu. , ser. 
2, V. 7, p. 270—311. 
The Seventh Series 31, X, 1902 in the Tijdschr. d. Ned. Dierk. Vereen , ser. 2, 
vol. 8, p. 17-34. 
The Series are independent from one auother. 
lijdschr. V. Enioin. XLV. 9 
124 (dk. a. c. oudemans). notes on acari. 
Anystis haccarum (L.), 3 ex. On Alnus glutinosa (L.j, Sept., 
1900. 
Tarsonemus floricelus Can. et Fanz. In Ceratoneon attenua- 
timi Biemi on Prmms Fadns L., Sept., 1900. 
PJiomhognathus setosus (Lohm.) , 3 ex. In subsaline algae., Sept. , 
1900. 
Camìsia glabra (Michael), 1 ex. In subsaline algae. Sept , 1900. 
Liacarus corac'miis (G. L. Koch) , 3 ex. Under chips on the 
sea-shore, July, 1897. 
Eremaeus coufervae (Schrank), 5 ex. In subsaline algae, Sept., 
1900. 
Scutovertex bilineatus Micliael, 2 larvae, 27 nymphae, 16 adulti. 
In subsaline algae, Sept., 1900. 
Nofaspis seminitlimi (Panz.), 1 ex. Under chips on the sea-shore, 
July, 1897. 
Notaspis alatns Herrn., 1 ex. 
Lenttmgula algivorans Michael, 6 nymphae, 4 ?. In subsaline 
algae, Sept., 1900. 
Eriophyes laevls (Nal.). In Cephaloneon 'pustulatum Bremi on 
Almis glutinosa L., Sept., 1900. 
Erìojìhìjes tilìae (Pagenst.). In Ceratoneon extensum Bremi on 
Tïlïa ulmijolia Scop., Sept., 1900. 
Erlophì/es pacìi Nal. In Ceratoneon attenuatum Bremi on Primns 
Padus L., Sept , 1900. 
Prof. Julius Wagner, ot Kiew, caught some Acari on Ves- 
pertilio fjipistrellus and sent them to Mr S. A. Poppe, who 
piesented them to me for determination. They were larvae of 
Argas vespertilionis (Latr.). 
The same Russian Professor collected Acari on four bats , which 
were forwarded to Mr, S. A, Poppe, who sent them to me. The 
four tubes did not bear any mentioning of locality, nor of the 
hosts; they contained each several individuals of: 
Liponyssus lepidopeltis (Klti.) (see below), 
Spinturnix niystacina (Klti.), 
and one of the tubes: 
(dr, a. c. oudemans). notes on acari. 125 
Uropoda wagneri Oudms. , 1 ex., nov. sp. 
ThromMd'mm russlcum Oudms. , 1 ex., nov. sp, 
Acotìjledon paradoxa Oudms. , 1 ex. , nov. gen. , nov. sp. 
2. Acari of Congo. 
Mr. S. A. Poppe , of Vegesack , asked me to determine some 
Acari, found by Mr. Paul Hesse, on a Vespenigo paf/emfecheri 
Nck., 18, IX, 1886, in Banana. I found in the little tube: 
Eremaeus hessel Oudms. , nov. sp. , 
lAponyssus musculi (C. L. Koch). 
Mr. Anton Greshoff, of Brazzaville, Congo, handed me four 
specimens of that locahly, aUied to Amhii/omma venustum C. L. 
Koch and A. aunulipes C L Koch (See Tijdschrift voor Entomo- 
logie, V. 39, p. 192). The animals were caught in 1893. Prof. 
G. Neumann, of Toulouse, determined them as Amhlyovima splen- 
didimi Gieb. 
In 1896 I received from Mr. Anton Greshoff a few Thromhidium, 
which prove to be Tromhidium tinctoiium (L.), and a lot of Ixo- 
didae , whicli Prof. Neumann determined as : 
Ainblyomma splendidum Gieb. <? , Î , 
Amhl. dubitatmn Nn., ?, 
llyalowma affirie Nn , $ , and 
RJtipicephalus tmrsa Can. et Fanz. 
3. Acari of Chili. 
In 1900 I received from Dr. J. C. C. Loman 10 specimes of 
an Acanis , found parasitic on Discocyrius fune, tus Butler, an 
Opilionid of Chili They are larvae, but characteristic enough to 
describe them. I will call them Erythraeus lomani Oudms., nov. sp. 
4. Acari of Brazil. 
From Mr. S. A. Poppe, of Vegesack, I received a tube with 
Acari, found by Dr. H. von Jhering , 25, IV, 1899, on a. Fam- 
pyrops lineatus Geoff. , in Sao Paulo. The species is new and will 
be described below under the uRme o( PeriyliscZ/rtisj/ieringi Oudms., 
nov. sp. 
r 
126 (dr. a. c. oudkmans). notes on acari. 
5. Acari of Luxemburg. 
In April 1900 the following Acari were caught by the Rev. 
Eric Wasm.
n , S. J. , in a nest of Formica 7'ujlbarhls F , in 
Luxemburg. 
Hypoaspis cuneifer (Michael), 
Hi/poaspis niyrmex-ophilns (Her!.), 
Glyphopsis coccinea Michael. 
6. Acari of Malaidca. 
In the acai'id-chaniber in the first abdominal segment of Kopt- 
orthosoma aestnans (L.) of Singapore, Mr. J. D Alfken, of 
Bremen, found in October, 1900, one single specimen of an 
Acarns, which I will call Greenia al]keni Oudms., nov. sp. 
7. Acari of India. 
In llie acarid chamber of bees of India, sent lo me by Mr. J. 
D. Alfken, 1 found the following Acari, Oct., 1900: 
Greenia alfkeni Oudms., nov. sp., 6 ex., 
Koptorfhoso7naaestu- 
ans L. 
Greenia perkimi Oudms., 7 ex., in Kop/orf/w.soma femdscapa VJ esiw . 
Hypoaspis greeui Oiidms. , nov sp., 10 ex., in KoptortJiosoma 
tenuiscapa Westw. 
TricJiotarsus heienae Oudms. , nov. sp. , 6 ex. , in Koptorfhosoma 
tenuiscapa Westw. 
TricJiotarsus hipposiderus Oudms. . nov. sp. , 1 ex. , in Koptor- 
fliosoma tenuiscapa Westw. 
Trichotarsus kopiortliosomae Oudms., 135 ex., in Koptorfhosoma 
tenu incapa Westw. 
8. Greenia alfkeni Oudms., nov. sp. 
(With Plate 10 fig. 1-5). 
Brielly described in Entomologische Berichten, p. 37; 1, VII, 1902. 
Ni/mpha. Length trom 1225 — 1295 ^t. — Colour: the usual 
yellowish-brown of Gamasids. Shape oval , robust , like a Uypoaspis. 
The dorsal side (Fig. 1) is protected by one strongly chitinized 
[DU, A. C, OUUKMANS). NOTES ON ACARI, 127 
shield, oval in shape, with top turned backward. Between the 
shoulders and the vertex the outline shows a second smaller shoul- 
der. Between the shoulder and the posterior end the margin of 
the shield has two denticulations or two incisions, which, however, 
are not comparable with the erosions of the shield of Greeniaper- 
klnsi Oudms. The dorsal shield is provided with about 80 relat- 
ively small hairs , which are somewhat curled and directed outward 
and forward, and symmetrically arranged. The dorsal shield is on 
the sides and posteriorly surrounded by the unprotected margin of 
the body , which bears hairs of the same shape as those on the 
dorsal shield. The hairs which surround the dorsum are the longest, 
as long as about the breadth of the legs. 
On the ventral side (Fig. 2) the sternal shield is somewhat 
trapezoidal, erosed as it were on its margins, bearing four hairs; 
it is small, compared with its breadth. The genital shield is trian- 
gular, long, distinctly chitinized posteriorly, indistinctly anteriorly. 
The anal shield is broad oval, large. The sügwata ore cup-like; 
their margins are bent inward , leaving an opening like a 
key-hole, and striated radially. This cup is of course a rudiment 
of'a peritrema. The venter is hairy. 
The episfoma (Fig. 3) is a triangular hyalin appendage with an 
indication of a lateral tooth. 
The mandibles (Fig. 4) are short , stout ; their immovable finger 
has a short canine tooth ; the movable finger is longer and pro- 
vided with an indication of a molar. 
The hjpostoma (Fig. 5) does not show inner or outer malae, 
but only a blunt chitinized appendage with a hyalin short piece. 
The ytrst leg is singulary provided with sliort, strongly chitin- 
ized, pailly blunt and partly sharply pointed thorns, all directed 
backward. The second leg. Its tibia has a blunt thorn directed 
backward ; its tarsus one blunt thorn, directed outwaid, and one 
forward (distalward). Femur, genu and tibia have moreover long 
stiff hairs, directed outwaid and backward. The third and fourth 
lega bear long stiff hairs. On the coxae 1 , 2 and 3 (Fig. 2) there 
are two, and on coxa 4 only one sharp, somewhat curved spines. 
128 (dr. a. C, OUDEMANSÌ. NOTES ON ACARI. 
Habitat: the acarid-chamber in the first abdominal segment of 
Xjjlocopa [Koptorthosoma^ aesluans L. 
Patria: Malakka, India. 
9. Key to the species of Greenia Oudms. 
^ Dorsal shield with lateral incision. 6. perkinsi Oudms. 
1 ) 
' Dorsal shield without incisions. . 6. alfkeni Oudms. 
10. Hypoaspis greeni Oudms. , nov. sp. 
(With Plate 10 fig. 6—8). 
Briefly desciibed in Entomologische Berichten, p. 37 ; 1, VII, 1902. 
Female. Length 525 — 560 ;«. — Colour: the usual Gamasid- 
yellow. — Shape oval , typical that of Ili/poaspis. — Dorsal 
side (Fig. 6) provided with one doi'sal shield, smooth, with some 
symmetiically arranged hairs, which are long in front and near the 
shoulders, minute on the remaining part. Two strong bristles on 
the posterior margin. 
Ventral side (Fig. 7). The sternal shield is perfectly trapezoidal, 
with straight anterior and posterior edges. The geniti-ventral shield 
shows a marking like a network with large meshes, a rounded 
posterior margin and an indistinct anterior one, which probably 
lies over the sternal shield. There are two little oval metapodial 
shields and a small triangular anal one. The per itrema runs to the 
sides of legs 1. Its beginning is a cup, strongly remembering us 
of that of Greenia. 
The epistonia (Fig. 6) is a long, triangular hyalin appendage. 
The hyposto7na (Fig. 8) is very abnormal , such as is unknown 
to me in other Parasitidae. It is narrow , long , tapering to the 
distal end Besides the common 6 hairs it shows us two beautiful 
curved horns and two inner malae; further a long lingula. 
Habitat: the acarid-chamber in the first abdominal segment of 
Xylocopa {Koptorthosoma) teuuiscapa Westw, 
Patria: India. 
10 
(l)K A. C. OUDEMANS). NOTES ON ACARI. 12 9 
11. Key to the species of Hypoaspis G. Can. 
Leg 2 in both sexes with spines. H. hermaphrodita (Beri. ) 
Leg 2 without spines ... 2 
? ventral and anal shields fused. 3 
? ventral and anal shields 
separate 5 
\ Body elongate H. holaspidoides (G. Can.) 
' Body subcircular 4 
\ Body without hairs. . , . H. tumidulus (C.L.Koch.) 
' Body with long hairs on margin H. placentula (Beri.) 
' ? anal and ventral shields 
touching with parallel edges 
$ anal and ventral shields remote 8 
; Body round-oval, scarcely shoul • 
6. dered 7 
^ Body long-oval, well shouldered H. arcualis (C. L. Koch.) 
„ ^ Body without hairs . . . . H. myrmecophilus (Beri.) 
' Body with marginal hairs. . H. canestrinii (Beri.) 
I Dorsal shield with lateral 
8. j incision 9 
' Dorsal shield without incision 10 
Q \ Body with minute hairs . . H. semiscissus (Beri.) 
' Body with long hairs . , . H. campestris (Beri.) 
^ Body red, nearly hairless . . H. lignicola (G. et R. Can.) 
' Body pale, yellow or brown, hairy, 1 1 
., i. Hairs club-shaped . . . . H. cuneifer (Michael). 
' Hairs otherwise 12 
.^ ( Hairs cultrate 13 
' Hairs usual 14 
[ Leg 2 in both sexes thicker 
13. , than 1, 3, 4 H. miles (Beri.) 
' Leg 2 not thicker . . . . H. pavidus (G. L. Koch). 
Hairs short 15 
Hairs long 19 
. e t Tarsus 4 with strong spines. H. aculeifer (G. Can.) 
Tarsus 4 with hairs , . .16 
14 
1 ÒO (DR. A. C. OUDEMANS). NOTES UN ACARI. 
.p. ^ Epistoma rounded . 
' Epistoriìa otlierwise - 
. _ L Body long-oval . 
' Body short-ovai . 
. rj ( Body well-shouldered 
' Body not sliouldered 
17 
20 
H. Iiypudaei (Oudins.) 
•18 
li bombicolens (G. Can.) 
H. oophilus (Wasm.) 
19, 
20. 
^ Legs 2 thicker than 1, 3, 4. H. krameri (G. et R. Can.) 
^ Ail the legs thick .... H. celeripediformis(Oudms.) 
^ Epistoma with 3 spines , . H. eossi (A. Dug. 
' Epistoma pointed .... H. greeni (Oudms). 
12. Liponyssus lepidopeltis (Kili.) 
(With Plate 10 fig. 9- 19). 
Nympha. hengtli 360 — 528 /'. — Colour white, or pale. — 
Shape like that of the nympba of lÀponyssufi muscidl (L. C. Koch). — 
Dorsal side (Fig. 9). Shoulders and sinuations above coxae 1 
distinct; sides nearly parallel lines; posterior abdomen rounded. 
Surface finely wrinkled, except on the shields. There are two large, 
scaly, and 8 intermediate shields; tlie anterior is subpentagonal , 
with 6 paiis of larger marginal stiff hairs, and 4 pairs of smaller 
inner dito; the posterior is subpentagonal with top turned for- 
ward, and with four pairs of larger marginal and three pairs oi 
smaller inner hairs. On the striated soft skin , surrounding the 
shields there are 8 pairs of marginal and two pairs of internie 
diate stiff' hairs, which are nearly of tlie same size as the marginal 
hairs of the shield. 
Ventral side (Fig. 10). The sternal shield is pentagonal, dis- 
tinctly scaly, with 6 bail's; the anal shield oval, with the us- 
ual three liaii's and top turned backward. Cribrum present. 
Between the sternal and anal shields four pairs of hairs. 
Legs shorter than body (Fig. 9), not much longer than its 
breadth. Femur 1 and 2 provided with the usual spines. Coxa 2 
with spur turned forward (Fig. 10). 
Male. Length about 480 p. — Colour pale; dorsal shield darker, 
straw-coloured. — Shape ë[onga.ie, l)ermaiij/ssus-\\ke. Bodi/ {Y\^ 11) 
well shouldered, with sinuation above coxae 1. Largest breadth 
(dr. a. c. oudemans). notes on mari. I'M 
about the level of leg 3, tapering slowly backward; posterior 
margin of abdomen rounded. Dorsal side for the greater part 
protected by a scaly shield, which follows anteriorly to the 2d 
pair of legs the margin of the body; further it is surrounded by 
the improtected skin. The greatest breadth is at the level between 
legs 2 and 3, tapering slowly backward; posterior margin round- 
ed; before this last portion the lateral margin of the shields 
bends a little inward. There are four longitudinal broken rows of 
little hairs on the shield. Remarkable are a stronger hair on the 
shoulder, a ditto on the level of leg 4, and two ditto quite pos- 
teriorly. To the sides of the shield the skin has 9 hairs, and 
behind the shield 9 pairs, of which 4 pairs quite marginal are strong. 
Ventral side (Fig. 12). There is a distinct furrow between the 
scaly sterni-genital and the ventri-anal shields, and an indistinct 
one between the ventral and anal portion of the latter. This ven- 
tral portion therefore is hexagonal, with lateral angles. The sterni- 
genital shield with 5 pairs, the ventral with 6 pairs of hairs. To 
the sides of the ventri-anal shield about 9 pairs of hairs. — 
Peritrema of middling size, reaching not beyond the coxae 2. 
Episfoma pointed anteriorly (Fig, 11). 
Mandibles chelate, without teeth, but with spoon-shaped appen- 
dage. Fig. 13 shows us the left mandible seen from above; fig. 14 
the right one from the ventral side. 
Hypostoma (Fig. 15) deeply split, with inner and outer appa- 
rently movable malae, forming pincers, without teeth; the inner 
malae blade-like, the outer like a spine. Palps. Fir.'t article with 
a ventral appendage, imitating a swallow's nest (Fig. 16). 
Legs (Fig. 11) shorter than the body ; legs 2 and 3 not much longer 
than its greatest breadth. On femur 1 and 2 the common spines; 
coxa 2 (Fig. 12) with sharp spur forward. 
Female. Length about 540 ^i. — Colour pale, with darker 
straw-coloured shield. — Shape elongate, tapering to both ends, 
except when the animal is swollen , in which instance it is broadest 
posteriorly, with median incision. Dorsal side (Fig. 17) for the 
greater part protected by one shield, with scaly surface, tapering 
132 (UR. A. e. ÜTJDEMANS). NOTES ON ACARI. 
to both ends, largest in the middle, and with slight sinuation 
laterally before the hindmost rounded portion. It is provided with 
lour longitudinal rows of small hairs, two marginal and two 
broken median ones. Quite posteriorly two longer hairs. The sides 
of the body are very sinuous. 
Ventral side (Fig. 18). Here we have a nearly triangular ster- 
nal shield, laterally with shai'p angles between the coxae 1 and 
2 , with deep posterior rounded excavations to receive the lower 
genital lip, and with 6 hairs. The genital shield is long and nar- 
row, longitudinally scaly and gradually passing anteriorly into the 
striated portion. Anal shield oval, large. Many small hairs around 
the ventral portion of the genital shield and around the anal one. Perl- 
trema long, reaching before the coxae 1. Remarkable is, that the 
peritrema reaches the dorsal side above coxae 1 , 2 and 3 (see 
fig. 17). 
Epistoma , hyposfoma and palps like in the S. 
Mandibles (Fig. 19) chelate, the movable finger with a hook 
distally, which is outside provided with two smaller hooks and a 
little knot. 
Lejs. Compared with the male, the legs ai'e longer, esp. 1 
and 4. 
Habitat'. Mus rattus , Vespertilio mur'tnus. 
Patria: Netherlands, Russia. 
13. Key the species of Liponyssus. 
NympJis. 
I With 8 intermediate shields L. lepidopeltis (Klti.) 
1. With 6 ditto 2 
' Wih 4 ditto 3 
t) \ Legs slender, esp. 1 and 4. L. rhinolophi Oudms. 
• Legs thick, esp. 1 and 2 . L, ciielophorus Oudms. 
iPost. dors, shield with 6 
bristles L. musculi (C. L. Koch). 
Post. dors, shield with 2 
bristles 4 
4. 
4. 
5. \ 
(DK. A. C. ÜUBKMANS). NOTES ON ACA.B1. l^-'J 
Post. dors, shield half as wide 
as ant L. lacertarum (Cont.) 
Post. dors, shield nuch nar- 
lower L. saurarum Oudins. 
Males. 
With brooin of bristles 
around anus L. COrethroproctus Oudms. 
Without broom .... 2 
With 2 enormous curved 
spines on each side . . L. uncinatus (Can.) 
Without such unci ... 3 
Dors, shield narrow , sur- 
rounded by unprotected 
skin L. musculi (C. L. Koch). 
Dors, shield wide, occasionally 
and esp. posteriorly sur- 
rounded by narrow unpro- 
tected margin .... 4 
Distinct demarcation between 
sterni-genital and ventri- 
anal shields L. lepidopeltis (Klti.) 
No such demarcation. . . 5 
Femur 3 with spur . . . L. lacertarum (Cont.) 
Femur 3 without spur . . 6 
Peritrema reaching level be- 
tween coxae 2 and 3. . L. saurarum Oudms. 
Peritrema passing coxae 1 . L. albatus (C. L. Koch). 
2. 
Females. 
Two dorsal shields . 
One dorsal shield . 
Sternal shield present 
No sternal shield more . 
Sternal shield trapezoidal 
Sternal shield linear . 
L. musculi (C. L. Koch). 
2 
2 
L. uncinatus (Can.) 
4 
L sylviarum (Can. et Panz.) 
134 (UR. A. e. OUUEMANSÌ. NOTIOS UN ACARI. 
Legs 1 and 2 tliick ixnd short ; 
femur i and 2 dorsally 
with 2 spines . . . . L. spìnosus Oudnis. 
Legs 1 and 2 noi so thick. 5 
Dorsal shield wide , occasion- 
ally and esp. posteriorly 
surrounded by unprotected 
5. ( margin 6 
Dorsal shield narrow; sur- 
lounded by unprotected 
hairy skin 8 
Coxa 2 with 2 spines , one 
forward and one backward; 
6. ( coxa 3 with 2 spines 
backward L. albatus (C. L Koch). 
Coxa 3 with 1 spine forward. 7 
(Body and dors, shield broad ; 
palp without appendage . L. corethroproctus Oudms. 
Body and dors, shield elon- 
/ gate; joint 1 of palp ven- 
1 trally with appendage. . L lepidopeltis (Klti.) 
Peritrenia reaching coxa 2; 
doi's. shield without con- 
striction in the middle . L. lacertarum (Gont.) 
Peritrenia passing coxa 1 ; 
dors, shield with constric- 
tion in the middle. . . L. saurarum Oudms. 
14. Periglischrus Klti. 
The genus 'Perigllscitrus of Kolknati has long times been lost. 
I have found it again in a tube with parasites of a Biazilian bat, 
found by Dr. H. von Jhering in Sao Paulo (Brazil). 
KoLENATi's description of the female is very good. His « Augen 
an der Unterseite» are light-refracting chilinizations on the baze 
of the palps. 
KoLENATi's genus Periglischrus is only based on the female. 
(dr. a. c. oddemans). notes on acari. 
135 
I should like io definite the genus as follows : 
«Legs 1 have between theii- coxae the «rostrum.)) All the legs 
short and thick, subequal in thickness. Two dorsal shields. ? with 
genital shield. Type Periglischrus caligus Klti. » 
15. Periglischrus jheringi Oudms. 
(With Plate 11 fig. 20—27). 
Briefly described in Entomologische Berichten, p. 88 ; 1, VII, 1902. 
ProtonympJia. Length 480 ,«. — Colour between pale and sul- 
phureous. — Shape Sjnntnrnix-Wke ; body flat, oval, top back- 
ward. — Dorsal side (Fig. 20) protected by two dorsal shields. 
The anterior dorsal shield subheptagonal , truncated and excavated 
trapezoidally posteriorly; the foremost half of the lateral margins 
and the anterior margins with sinuosities between the 4 paiis of 
hairs which surround it. The posterior dorsal shield nearly trian- 
gular. There is a narrow space between the two dorsal shields. 
At the level of this space there is a hair on each side, and out- 
ward of this hair the stigma (see below.). — Ventral side (Fig. 
21) with subheptagonal stern.d shield, truncated anteriorly , pointed 
posteriorly, with 3 pairs of hairs. No anal shield. Behind the 
sternal shield and between the coxae 4 four pairs of hairs. Stigma 
perfectly lateral , invisible when the animal is viewed from the 
dorsal or from the ventral side (Fig. 20 and 21). — Peritrema 
dorsal, short, running forward and outward exactly to the level 
between legs 2 and 3. Legs resembling those of the deutonympha 
(Fig. 22). 
Deutonympha. Length 560 u. — Colour between pale and sul- 
phureous. — Shape Spinturnix-Vike ; body flat, oval, broader than 
in the protonympha , top backward. — Dorsal side (Fig. 22) 
protected by two dorsal shields. The anterior dorsal shield subhep- 
tagonal , truncated and excavated posterioily, pointed anteriorly; 
margin without the above mentioned sinuosities of the protonympha. 
The posterior dorsal shield subpentagonal, with 3 sides contiguous 
to the anterior shield. The two shields are surrounded by 6 pairs 
136 (dr. a. c. oudemans). notes on acari, 
of hairs (one pair more than in the protonympha). — Stigma 
dorsal, outside of the most posterior dorsal hair, on the level 
between legs 3 and 4. — Periirema wholly dorsal, diverging 
till the level between legs 2 and 3 , and then converging to 
the level of legs 1 and 2 — Ventral face (Fig. 23) like that 
of the protonympha , but with a pair of hairs between the sternal 
shield and coxae 3, and with 11 pairs of hairs l)etween coxae 
4; anal shield small, witli one pair of minute hairs. — Legs like 
those of the adults. 
Male. Length 560 «. — Colour between stoney-coloured and 
tawny. — Shape S^i'mturnix-Wke. — Bodi/ flat, oval or subhexa- 
gonal, like the combination of the two dorsal shields (Fig. 24). — 
Dorsal side protected by two dorsal shields , which are coalesced as 
to form one. Together they form an elongate hexagonal shield, 
blunt, with two sides forward, pointed backward. Six pairs of hairs, 
of which the two foremost pairs are planted iii the margin of the shield. 
Stigma and peritrema like in tlie deutonympha. — Ventral side 
(fig. 25). Sternal shield shield-shaped with a prominent anterior 
top and two anterior rounded corners , and with 5 pairs of hairs. 
Under the anterior top the genital opening. Between the sternal 
and anal shields 2 pairs of hairs. Anal shield with 4 pairs of hairs and 
flanked by two pairs — Legs (Fig. 24) short , thick . almost regularly 
with 6 rows of hairs, two rows of minute hairs ventrally, 2 rows 
on the sides, and 2 rows dorsally. The dorsal hairs of femur and 
genu longer than the others. — Coxae 2 with quite lateral stiff 
hair. — Between the palpi the two dorsally and backward crooked 
appendages of the inaudibles (most probably copulation-organs) are 
visible. 
Female. — Length 1040 — 1120 ft, — Colour like in the </. — 
Shape very singular: the fore-half Spinturiiix-Wke , the hinder-half 
(Fig. 26) is a flat , reversed chinese fan , with sharp edges and 
with wrinkles parallel to the posterior margin of the dorsal shield 
and to the margin of the fan itself. With this fan the animal 
sticks firmly on the patagium of the bats, as Kolenati tells us. Anus 
terminal , in a little incision. — Bodj/ flat and nearly circular. — 
(dr. a. c. oudemans) notes on acari. 137 
Dorsal side (Fig. 26) protected by two dorsal shields coalesced 
together, like in the male, but posteriorly less pointed. The 6 
paii's of hairs are present , but only the most anterior pair is planted 
in the margin of the shield, and minute. Moreover the fan bears 
a minute pair. Stigma and peritrema like in the deutonympha 
and S, except the anterior half of it, which is sunuated and 
longer. — Ventral side (fig. 27). The sternal shield is broad 
pyriform, without any hair, but surrounded by 3 pairs of minute 
hairs. Another pair of minute hairs on the level between coxae 
3 and A. There is an indistinct, small oval genital shield between 
the coxae 4 and provided with a pair of minute hairs. In the 
centre of the fan a pair of minute hairs ; between this pair and 
the anal shield two pairs of ditto ; the anal shield long and narrow , 
with one pair of distal minute hairs. 
Habitat: Vaynpijrops lineatus Geoffr. 
Patria : Brazil. 
16. Key to the species of Periglischrus Kol. 
I The two dorsal shields free 2 
1. The two dorsal shields con- 
' tiguous 5 
Ant. dors, shield pyriform , 
çy J or oval , top forward. . 3 
Ant. dors, shield nearly cir- 
cular P. interruptus Kolen. 
Post. dors. sh. pyriform or 
o ) oval, top forward ... 4 
Post. dors. sh. pyriform or 
oval, top backw. ... P. hipposiderus Kolen. 
Î Flat portion of abdomen 
, , not wider than body . . P. asema Kol. 
$ Fiat portion of abdomen 
suddenly wider .... P. glutinimargo Kol. 
t>. 
138 (dr. a. c. ottdemans). notes on acari. 
Î genital shield wider than 
sternal P. caligus Kolen. 
? genital shield narrower than 
sternal P. jheringi Oudms. 
17. Uropoda wagneri Oudms. nov. sp. 
(With. Plate 11 fig. 28—30). 
Briefly described in Entomologische Berichten, p. 38; 1, VII, 1902 
I have only one deutonyrnpha , found by Prof. .1. Wagner on 
a Russian bat. 
Deutonyrnpha. — Length 568 «. — Colour very pale straw- 
coloured. — Shape like that of Urojmla kravicri. — The dorsum 
(Fig. 28) is quite polishe 1, with numerous little hairs, which stand 
in irregular I'ows, almost parallel to the margin. It is protected 
by a median dorsal shield which only quite anteriorly is fused 
with the circumjacent ring formed by the coalescense of the lateral 
and posterior shields. This ring is almost hairless. — On the 
ventral side (Fig. 29) you observe the sterni-genital shield, with 
slight excavations at the level of coxae 2 and 4, and with 5 pairs 
of large pores; it is polished. The venlri-anal shield is broad, 
semilunal, with anterior margin sowewhat bowed inward, and with 
6 pairs of large pores. The metapodial shields are truncated poster- 
iorly and fused with the pedal ones; there is a deep gut between 
coxae 3 and 4. The pits for the legs are small, just large enough 
to receive them. The stigma, as is usual, lies in the pit 3. The 
peritrema runs first outward to reach the edge of the body, then 
bends inward between the pits 2 and 3, then again outward, 
not quite till tlie edge, then slowly inward and forward passing 
the pit 2 and proceeding till the foremost margin of the pedal shields. 
The hypostoma (Fig. 30) is very characteristic. It shows a wide 
cleft, separating the inner malae. These are pointed and bear a 
(movable?) inner and lower appendage, forming pincers The outer 
malae are thick, well chitinized. The 6 hairs of the hyposlome 
are beautiful feathers; moreover the edge of the rostral tube bears 
1. 
(dr a. c. oudemans). notes on acari. l'îO 
quite under the first joint of the palpi two featliered hairs on 
each side. 
On legs, palin , mandlhles etc., no particularities. The femurs 
have no blade at all. 
Habitat 'Ì Occasionally on a bat. 
Patria : Russia. 
18. Key to the species of Uropoda Latr. 
Median dorsal shield ornated 
with chitinous ridges ... 2 
Median dorsal shield without 
such ridges 4 
Anteriorpart of abdomen simu- 
2. ] lates a céphalothorax . . . berlesiana Beri. 
( No simulation of cephalotorax. 3 
iTwo suboval spaces on dorsum 
joined by a median line. . festiva Beri. 
No such arrangement . . . laminosa Can. et Bei\ 
1 Anterior margin with chitinous 
^. membrane 5 
^ No such membranes ... 6 • 
Body subpyriform; membranes 
extending to legs 4 . . . canestriniana Beri. 
Body broad-oval; membranes 
extending to legs 2 . . . cristiceps Can. 
g ( Dors, concave; margins upward carinata Beri, 
( Dors.convex; margins downward 7 
iAnal shield distinct , separate 
from ventral shield ... 8 
Anal shield fused with ventral 
shield 11 
I Sternal shield post, denticulate; 
1 anal shield crescentshaped . 9 
I Sternal shield indistinct or pos- 
teriorly not denticulate . .10 
lijdschr. V, Entom. XLV. 10 
140 (dr. a. c. oudemans). notes on acari. 
Q ^ Dorsal shield with hairs . . paradoxa C. et B. 
\ Dorsal shield without hairs . pusilla Beri. 
j Anal shield small , sub-seuii- 
10. circular obovata C. ol 15. 
' Anal shield large , luniforin . elimata Beri. 
., ; Post, dors, shield present. . 12 
\ No post. dors, shield . . .43 
12. 
i Posterior dorsal shield very 
\ 
j small , body hairy .... obscura G. L. Koch. 
15. 
Posterior dors, shield luniform ; 
I body without hairs . . . tecta Kram. 
• ^ I Dors, shield rough, punctulate. 14 
' Dors, shield polished . . .16 
[ Dors, shield surrounded by 
14. j broad margin elegans Kram 
^ Dors, shield without margin . 15 
I Marginal and dorsal hairs mi- 
I nute, smooth ..... ovalis (Koch) 
j Marginal and dorsal hairs clav- 
\ ate and plumose .... patavina Can. 
/ Metapodial shields fused with 
16. 1 ventri-anal shield . . . .17 
( Metapodial shields distinct. . 20 
. ,- I Anus terminal lagena Beri. 
( Anus ventral 18 
/ Anteriorly two little hairs di - 
18. j rected forward tridentina Can. 
' No such hairs 19 
[ The level of legs 4 just divides 
the body in two halts . . hypopoides B. 
The level of legs 4 is far more 
backward ricasoliana B. 
, Four hairs longer than body post. 
20; on ventral shield .... longiseta Beri. 
' No such hairs . . • . .21 
19. 
2J. 
22. 
(dr. a. c. oudemans). notes on acari. 141 
Median dors, shield surrounded 
by marginal shield except an- 
teriorly . 22 
Only one dorsal shield. . . campomolendina B 
Metapodial shields with acute 
posterior angle krameri Beri. 
Metapodial shield with lounded 
posterior angle ..... javensis Oudms. 
Metapodial shield truncated 
posteriorly wagneri Oudms. 
19. Erythraeus lomani Oudms., nov. sp. 
(With. Plate 42, fig. .31—38). 
Larvae. Co/o2^r vermillion. — Length of body 52.5; ofbody pseu- 
docapitulum and rostrum 700 ^< — Borsai side (Fig. 31). It 
seems to me that the whole skin is soft. No dorsal shield is visible 
and no crista. The space, which should be occupied by a dorsal 
shield, bears 2 pairs of very fine sensorial hairs and 2 pairs of 
stronger feathered hairs. — The two eyes are prominent, far 
remote, situated in the foremost fourth part of the body, a space 
almost destitute of hairs, comparable with the thorax of the adult. 
They are on a level behind the two hindmost sensorial hairs and 
before the coxae 2. — Next to each eye there is a hair inward. 
The real abdomen is hairy, without any indication of segmentation. 
The hairs stand in transversal and longitudinal rows , but irregularly. 
Only the foremost transversal row and the two most central lon- 
gitudinal rows are distinct. 
Ventral f ace (Fig. 32). — The coxae are not contiguous. The 
coxae 2 and 3 bear distally and forward a spine, and on their 
ventral side a hair. On the inner side of coxae 1 and 2 you 
observe a hair. In the hind half of the space between the coxae 
2 and 3 there are 14 hairs ranged in 7 pairs; between the coxae 
3 one pair, and behind the coxae 3 on the belly 3 pairs. The hinder 
part of the belly is also somewhat hairy, like the dorsum. — 
142 (DR. A. C. OUDEMANS). NOTES ON ACARI. 
Legs. (Fig. 31). The remur of all the legs is distinctly divided 
in two joints (is provided with a profemur). Seen from aside all 
the tarsi (Fig. 33) are somewliat swollen and falling off distally. 
There is a little praetarsus with two strong claws and a pulvillum. 
The legs are provided with feathered hairs ; on the proximal joints 
the hairs resemble those of the body (Fig. 34) , distally they are much 
more feathered (Fig. 35^. The tibia and tarsus bear one or two 
olfactorial hairs (Fig. 36) and one or two tactile ones (Fig. 37). 
The proximal third part of the mandibles (Fig. 31) is swollen 
and dorsally flat; the remaining two thirds suddenly become narrow. 
Close to the end they are embraced by the maxillae (Fig. 31, 32 
and 38), which show there a hyalin somewhat serrated edge. The 
mandibles have no chelae, nor stylet, hooks, or other appendages. 
The 7naxillae bear or their ventral face two pairs of tactile hairs. 
(Fig. 32). 
The palps have only 4 free joints (Fig. 38), decreasing in length 
and in bulk. The third joint ends in an enormous hook and bears 
ventrally and outward the fourth joint or «appendage». This too 
ends in a hyalin chitiìioiis claw. 
Habitat: Discocyrtus funestus Butler (an Opilionid). 
Patria : Chili. 
20. Key to the species of Erythraeus Latr. 
Larvae. 
. ( With dorsal shield . , . . E. phalangioides (de Geer). 
( Without dorsal shield ... 2 
I Without crista E. lomatii Oudms. 
2. With crista like that of the 
^ adult E. quisquiliarum (Herm.) 
21. Thrombidium russicum Oudms. nov. sp. 
(With Plate 12 fig. 39—42). 
Only one larva is known to me, found by Prof. J. Wagner on 
a Russian bat. 
Length 424 ƒ< without capitulum. Colour pale. — 
(du. a. c. oudemans). notes on acaki. 143 
In many particularities this larva (Fig. 39) resembles that of 
Tr. gi/7miopterontm (L). I can nothing say about the pseudostig- 
matic organs, as they were wanting. 
These is but one dorsal shield, with 5 hairs and 2 pseudo- 
stigmata, the situation of which is perfectly as in the named 
larva. On the back there are only four transversal rows of four 
hairs each. All the hairs of the body are thick and feathered (Fig. 40), 
The body does not show any deep fold or segmentation. There are 
so far as I could observe only hvo eyes. The maxillar palp (Fig. 41) 
ends in a bifid claw. I did not observe a fifth joint appending to 
the fourth claw-bearing one. The second joint projects with an 
angle sidewards (Fig. 41 represents the ventral face of left palp). 
The ventral face of the body (Fig. 42) shows also less hairs than 
in the above named larva. — The middle claw is twice thinner 
the lateral ones. 
22. Key to the species of Thrombidium F. 
Larvae. 
1. 
Two dorsal shields . . 
One dorsal shield . . 
Q { On each side one eye . 
' On each side two eyes. 
o ( Psdst. org. filiform . . 
' Psdst. org. davate . 
. Thp. holosericeum (L.) 
. 2 
. Thr. russicum Oudms. 
. 4 
. Thr. gymnopterorum (L.) 
. Thr.BerleseiOudms.nov.nom. 
(Beri., Trom. Tab. XVI). 
23. Eremaeus hessei Oudms., nov. sp. 
(With Plate 12 fig. 43). 
Length 520 ^. — Colour tawny. — Shape resembling Eremaeus 
tibialis (Nie.) — Dorsal side (Fig. 43). Rostrum blunt ; céphalothorax 
usual shaped, with parabolic outlines; tectopedia 1 large ; tectopedia 
2 short ; lamellae blades ; translamella a distict blade , as wide as 
the lamellae; lamellar cusps distinct, ending in a stiff lamellar hair. 
Interlamellar hairs a good distance before the demarcation between 
144 [DU. A. C. OUDEMANS). NOTES ON ACAKI. 
abdomen and cephalotorax , and a good distance from the lamellae ; 
tliey are long and stili'. — Abdomen oval with narrow free blades 
at anterior corners of doisuni. This free blade bears /«;o stilf hairs. 
There are four longitudinal rows of stiff hairs ; the two outer ones 
of six hairs each, the two inner ones of four hairs each; you may 
also say: there are two dorsal rows of three hairs each, and a 
submarginal row of 14 hairs. — The pseudostigmala are small 
cups at the base of the lamellae, — The pseudostigmatic organs 
are small and have a slender peduncle and a thick davate head. — 
Ventral J ace. No striking particularities. — Lßgs, slender; femur 
1 and 2 with thin peduncle, — Claws tridactyle, very heterodactyle. — 
All the hairs, except those of the tarsi, are feathered, or serrated, 
which is best visible in those of the dorsum of the creature. 
Habitat: Vesper ug pagenstecJi eri ^ck; most probably strayed here 
Patria: Banana (Congo). 
Found by Mr. Paul Hesse, at present in Venise. 
24. Emendation of the key to the species of Eremaeus. 
(Das Tierreich, Oribatidae, p. 43.) 
, ( With tr. lam E. hessei Oudms. 
( Without tr. lam 4a 
Lam. wider anteriorly than pos- 
\ leriorly E. exilis (Nie.) 
^' j Lam. narrower anteriorly than 
posteriorly E. tibialis (Nie.) 
25. Trichotarsus helenae Oudms. nov. sp. 
(With Plate 12, fig. 44—45,) 
Hijpopus. Length 165 ^u. 
The creature is related to T. trijilis Can, , T. ornatus Oudms, 
and T. manicati Giard., and has Wkeiheaea^etiefi tivo dorsal shields. 
The anterior dorsal shield (Fig. 44) has only two minute bristles 
on the tip of the rostrum and two, situated on the edges, nearly 
(uh. A. e. OUBEMANS). NOTES UN ACA.U1. 145 
midwiiy between llie tip ot the rostrum and the shoulders. The 
posterior shield is almost hairless too, except that there is a minute 
hair some distance behind the siioulder and four pairs of minute 
hairs near the posterior edge. The sucker-plate projects behind 
the posterior edge. 
Yentral side, (Fig. 45). The epimera 1 join in the middle, 
forming an Y. The two sense-organs on the ventral side of the 
head are very small, but they have long sense-hairs. The sucker- plate 
is very large , willi hyaline margin and six large suckers of nearly 
equal size and two minute suckers to the sides of of the anus. 
Leys. All the legs have a minute claw; the tarsi 1 — 3 have 
four lancet-shaped hairs and a long tactil hair ; moreover the 
tarsi 1 — 2 have an olfactory hair. The tibiae 1— -3 bear a long 
tactil hair too. The tarsus -4 bears 4 hairs, the dimensions of which 
are '22, 33, 120 and 160 /'. 
Huhltat : in the acarid chamber in the first abdominal ring of 
Kojjtorthosoììia tenuiscapa Westw. 
Patria: India. 
Named in honor to my dear wife, who in sundry manners is 
assisting me in my study. 
26. Trichotarsus bipposiderus Oudms. nov. sp. 
(With Plate 12, fig. 46—47). 
Hijfopus. Length : 240 ,1*. The animal is closely related to the 
species T. xi/locopae, etc. 
Dorsal side (Fig. 46). The anterior lunular portion is soft, has 
about 10 wrinkles and 5 pairs of strong bristles, arranged like in 
T. xi/locopae and allies. The posterior round or oval portion, however, 
is protected by a shield which shows some longitudinal markings 
and a chitinization resembling a horse-shoe, behind which the 
back is concave. 
Ventral side (Fig. 47). The epimera 1 join in the median 
line to form an Y ; moreover they are joined sideward with the 
epimera 2 , which on their turn have a lateral prolongation behind 
146 
(üb. a. c. ouübmans). motes on acabi. 
the coxae 2. Between the epimera 3 tliere are two triangular 
chitinizations. — The sucker plate is small and shows two large 
suckers, before these two minute ones, and behind them four 
others of middling size. The dorsal shield is considerably sufflexed on 
the ventral surface, but does not reach forward beyond the posterior 
margin of the sucker-plate. This sufflexed piece bears two hairs. 
Legs. The tibiae 1 — 3 bear a long tactil hair and two elongate 
lanceolate hairs. The tactil hair on tarsus 3 is about 175;" long. 
The tarsus 4 ends in one long hair of about 350 m- and a very 
small one of about 15 ;". 
Habitat: in the acarid chamber in the lirst abdominal ring of 
Koptorthosoma tenuiscapa Westw. 
Patria: India. 
27. Key to the hypopi of Trichotarsus. 
I Two dorsal shields ; tarsi 1 — 4 
with minute claw ; circumfe- 
1. \ rence of animal sub-oval; dor- 
I sum almost hairless. Group A. 2 
I Tarsus 4 without claw . . 5 
Tarsi 1-3 with 4 leaf-like hairs. 3 
Tarsi 1-3 without such hairs . 4 
Two large, 4 middle-sized and 
2 minute suckers . . . . T. ornatus Oudms. 
Six suckers of equal size, 2 mi- 
nute ones T. helenae Oudms. 
Six suckers T. manicati Giard. 
Eight suckers T. trifilis Ganestr. 
Two dorsal shields; tarsi 1-3 
with minute claw; circumfe- 
rence of body sub-oval; dorsum 
with hairs; Group B . . . T. intermedius Oudms. 
Tarsi 1-3 with strong claw ; 
circumference of body sub- 
circular; dorsum with strong 
bristles 6 
6. 
7. 
11, 
(du. a. C. OUDEMANS). notes on ACAIII. 147 
Two dorsal shields; the anterior 
one triangular; Group C. . T. OSmiae (Duf.) 
One dorsal shield posteriorly ; 
Group D 7 
Tarsi 1-3 with 2 claws . . T. alfkeni Oudms. 
Tarsi 1-3 with 1 claw . . 8 
Tarsus 4 with one hair . . 9 
Tarsus 4 with two hairs . .10 
/ Tarsus 1 with 2 lancet-shaped 
9. hairs T. koptorthosomae Oudms. 
' Tarsus 1 without such hairs. T. xylocopae Donn. 
i Tarsi 1-3 with 4 lancet-shaped 
hairs 11 
Tarsi 1-3 without such hairs. T. bifilis Can. 
I On posterior abdomen a longit- 
udinal chitinization . . . T. japonicus Oudms. 
On post, abdomen a horse-shoe- 
' shaped ditto T. hipposiderus Oudms. 
28. Acotyledon paradoxa Oudms. nov. gen. nov. sp. 
(With Plate 12, fig. 48—49). 
Kramer's genus LabidojiJiorus is based on a hypopus, and the 
name refers to the two claspers at the ventral side of the posterior 
abdomen in the hypopus. 
Indeed , these claspers are exceedingly well fit for holding between 
them a Mammal's hair. 
Bermacarus of Haller too has claspers, assisted by two peduncul- 
ated muscular suckers, for the same purpose. 
No wonder that travelling nymphs , which must hing to the 
smooth , and even often polished body of Insects , are better fit 
for this manner of living when they are prepared with suckers. 
To climb their pegasus their legs, especially the fore-legs are 
provided either by enormous crooked claws to seize a hair, or 
with pedunculated suckers, which resemble a table-spoon, or even 
with blade-like hairs, the adhesion to the insect's body suffice to 
fix the little creature to it. 
148 (I)Jt. A. e. UUDEMANS.) NOTIOS UN ACAUI. 
What, however, to say of the hypopial nymph described here 
below, which is in its most primitive stade' of becoming an 
aeronaut ! It seems to me thai the name of Acotijledou liuradoxu 
is well chosen. 
The animal I'osemhles the hypopial nymphs of the yenus Tijro- 
(jlijphus, without any trace of suckers. Its length is 215 ^\ its 
colour pale. 
Fig. 48, Dorsal side. This is not wholly visible, as the lateral 
margins are sufllexed ventrally. Probably this is an 
instrument to fix on a s m o o t h s u r f a c e fi r m 1 y. 
AU the hypopi with a body with sharp edges have this beha^ 
viour. The dorsum is quite polished without any structure. Thei'e 
are two pairs of almost inperceptible hairs on the céphalothorax , 
four pairs on the abdomen and three pairs on the sufflexed margin 
(fig. 49). The abdomen lies over the céphalothorax with a sharp 
edged margin. The line of demarcation in slightly bowed forward. 
Fig. 49. Ventral face. The epimera 1 are coalesced to form 
an Y. The epimera '2 bow inward and hindward. Between legs 
2 and 3 there is a distinct demarcation between céphalothorax and 
abdomen, convex hindward. The epimera 3 are bowed forward 
and inward, and, united with epimera 4, limit a space of the 
abdomen which resembles a joint of a leg, so that at first view 
one is deceived , believing that the legs 3 are close together. 
Legs 3 aiid 4 are planted at the venter, much inward, and as 
they are short, the claws scarcely pass the circumference of the 
abdomen. Legs 1 and 2 are not longer than 3 and 4 , but as 
they are planted nearly at the anterior edge of the céphalothorax 
they are wholly visible from the dorsal-side. — All tlie legs are 
similar in structure. Tarsus 1 bears three curved and distally 
spatulate hairs, one tactile hair, as long as tarsus and tibia, two 
minute hairs and a rather long, distally slightly davate olfactoric 
hair. Tarsus 2 hat only one curved , distally spatulate hair ; 
moreover it is like tarsus 1 Tarsus 3 is only provided with 
one distally spatulate hair and one little tactile hair Tarsus 4 has 
a small and a long tactile hair, longer than the 4 distal joints of 
(dr. a. C. OÜJiKMANS). NOTKS ON ACAHI. 149 
the leg. All the tarsi end in the tolerably strony claw. Tibia 1 
is also provided with a tactile hair. 
Hubllat : A bat. 
Patria: Russia. 
29. Key to the genera of Tyroglyphinae. 
Hypopi. 
I Abdomen without sharp edges. '2 
^ I Abdomen with sharp-edgetl 
margins, which can be sufflexed 
ventrally (fixation-apparatus) . 6 
Ventral side without any tiace of 
suckers or claspers : Degener- 
ated hypopi of Gli/ci/phagus\ 
never free. ^) 
Ventral side with suckers or 
claspers; animals free living. 3 
Behind the anus a suckerplate. 4 
Behind the anus two claspers. 5 
All the legs equal in armature 
and in hairs of tar.si . . . Cerophagus Oudms. ^) 
Legs 4 quite otherwise. . . Trichotarsus Can. 
Under the claspers no sucker. Labidophorus Kramer, 
Under each clasper a peduncul- 
ated sucker Dermacarus H aller. 
Ventral side without any suc- 
kers at all Acotyledon Oudms. 
Behind the anus a sucker-plate. 7 
No eyes 8 
Two eyes 13 
1) According to Michael, Britisli Tyroglyphitlae , v.l. p. 168 sqq., 1 Nov 19U1. 
Arnhem, Januari 1902. A. C. 0. 
2) Tijdschr. d. Ned. Dierk. Vereen., ser. 2, v. Vili, p. XV. -17, IX, 1802. 
Arnhem, Dec. 1902. A. C. 0. 
150 (DK. A. C. OUDKMANS). NOTES ON ACARI. 
I AU the legs equal in length , 
short and thick ; legs 3 and 4 
usually turned backward . . 9 
All the legs slender; legs 3 and 4 
shorter and slenderer than land 
2 and usually turned forward .12 
Four pairs of suckers after one 
„ , another Aleurobius Can. 
Sucker-plate with 8 suckers, 
arranged 2, 4, 2 . . . .10 
I Anterior top of Gephth. hairless. Tyroglyphus Latr. 
10. Top of Gephth. with 2 minute 
^ hairs 11 
Epimera 1 very short, joined to 
the sternum; epimera 3 and 4 
joined to each other with a 
large bow Hypopus Dugès. 
Epimera 1 absent; sternum 
free; epimera 3 and 4 free. Glycyphagus Hering. 
12. Only one genus Anoetus Dujard. 
13. Only one genus Histiogaster Beri. 
Arnhem, A. G. Oudemans. 
1 October 1901. 
11