A NEW MONOTYPIC GENUS OF CHIGGERS AND FOUR NEW SPECIES OF QUADRASETA FROM VENEZUELA (ACARI: TROMBICULIDAE)' M. L. Goff and J. M. Brennan' Abstract.— Curebureia, n. gen., and its type-species, C. johnstoni, n. sp., are described. The genus Quadraseta Brennan, 1970, is redefined and a key to the 11 included species given. Four new species, Quadraseta tachirensis, holotype ex Akodon sp., Q. rotstieri, ex Proechhnys guyannensis, Q. mirandae, holotype ex Oryzomys albigularis, and Q. fakonensis, ex SylviUigus floridanus, are described. Four new species of Quadraseta Brennan, 1970, and a new monotypic genus, all from Venezuela, are described and illustrated be-low. Hosts are small mammals. Collections were made under the direc-tion of Dr. Charles O. Handley, Smithsonian Institution, Dr. Vernon J. Tipton, Brigham Young University, and Dr. Conrad E. Yun-ker, Rocky Mountain Laboratory. Holotypes are in the collection of the U.S. National Museum of Natural History (currently housed at the Bishop Museum, Honolulu, Hawaii) and paratypes are there and in the collection of the Bishop Museum. All mea-surements are given in micrometers of the holotypes followed in parentheses by the means and extremes of the type series. Quadraseta Brennan Quadraseta Brennan, 1970: 1695; Brennan & Reed, 1975: 62. Type-species.— Euschoengastia pazca Brennan & Jones, 1964: 700. Diagnosis.— Trombiculine larvae parasitic on small mammals and, occasionally, birds; legs 7-segmented; coxae unisetose; 2-3 gen-ualae I, genuala II and III; tibiala III; sub-terminala and parasubterminala I; 6 branched setae in basal whorl of tarsus I. Scutum sparsely punctate; subrectangular, with sinuous anterior and posterior margins; 5 setae; sensilla clavate to capitate. Eyes 2/2. Cheliceral blades with tricuspid cap; palpal tarsus with 4B; palpal claw 3-pronged. Quadraseta tachirensis, n. sp. Fig. 1 Type data.— Holotype and 7 paratypes from Tachira, San Cristobal, 21-III-1968, ex Akodon sp. (RML 53653); 2 paratypes, same data except 15-III-1968, ex Akodon bogo-tensis (RML 55933). Diagnosis.— Palpal setal formula B/B/BBB/4B; palpal claw 3-pronged; ga-leala B; 3 genualae I; 54 dorsal body setae; 2 pairs of humeral setae; PL>AM>AL; PW/SD = 1.83. Description of species.— Larvae. Idiosoma: Measuring 290 x 235 in engorged specimen. Eyes 2/2, anterior larger, on ocular plate. Two pairs of humeral setae, measuring 44-46; 54 dorsal body setae, measuring 32-40, arranged 6-10-14-10-6-6-2; 2 pairs of sternal setae, anterior 37-40, posterior 28-31; 42 preanal setae, 20-24; 20 postanal setae, 28-33; total body setae 124. Gnatho.sorna: Pal-pal setal formula B/B/BBB/4B; palpal claw 3-pronged; galeala B; chela (27) with tricus-pid cap. Scutum: Sparsely punctate; ante-rior margin biconcave, posterior margin bi-convex; AM base in line with AL bases; SB anterior to PL bases; PL>AM>AL; sensilla capitate, head with setules; PW/SD = 'Studies upon which this paper is based were supported in part by Department of Army contract DA-49-193-MD-2788 with the Smithsonian In-stitution. 'Department of Entomology. Bishop Museum, P.O. Box 6037, Honolulu, Hawaii 96818, USA. 501
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