PROC. ENT. SOC. WASH., VOL. 33, NO. 1, JAN., 1931 27 
Shannon, R. C, and Davis, N. C. 
1930. The Flight of Stegomyia aegypti. 
Am. Jl. Tro . Med.. 10: 151-156. 
Zetek, J. 
1915. Behavior of Anopheles albimanus and tarsimaculatus . 
Ann. Ent. Soc. Am. 8: 221-271. 
A NEW SCELIONID EGG PARASITE OF THE BLACK WIDOW 
SPIDER. 
By Herbert L. Dozier, Service Technique, Port-au-Prince, Haiti. 
It is very interesting to describe a reared species of Bceus, 
from the egg mass of a specifically identified spider, and espec- 
ially as its host is the generally feared, very poisonous Latro- 
dectus mactans. The egg masses were placed in glass tubes 
for observation. Young spiders hatching at the same time 
did not seem to take any notice of the wingless females and 
these remained alive in the tube as long as eight days. Numbers 
of winged males, however, were found dead in four days time 
but were apparently not eaten by the spiders. 
Baeus latrodecti, new species. 
This species is nearest in coloration to Bceus americanus Howard but differs in 
the general more yellowish-orange color, particularly the head, and is slightly 
longer in body length. 
Male. — Length, .86 mm. General color distinctly darker than the female, 
dark honey-orange with the dorsum of thorax and abdomen infuscated; legs 
honey-yellow. Antennae pale yellow, composed of eleven joints, the scape very 
long, much thicker and wider than the other joints, the club constricted near 
middle, making the club appear almost as being two-jointed. Wings hyaline, 
fringed, venation pale brown, marginal nervure very short, basal nervure dis- 
tinct, the stigmal long and oblique, no post marginal nervure present. 
Female. — Length .717 mm. Length of antennal club .115 mm.; width of 
club .046 mm. General color of head and body medium to dark honey-yellow, the 
abdomen a decidedly deeper or rusty color; eyes black; antennae honey-yellow, 
the basal half of pedicel fuscous; legs concolorous with the head, the last joint of 
tarsi blackish. Head large and broad, decidedly wider than the thorax. Pro- 
and mesonotum and abdomen with dark prominent setae when observed under 
microscope, less prominent on abdomen on account of the darker color of the 
latter. Antennae seven-jointed, the club very large, being slightly longer than 
the combined pedicel and funicle joints; funicle joints very narrow, short, 
transverse and subequal. Abdomen robust, rounded, distinctly wider than the 
thorax. 
Allotype wingless female mounted in balsam on slide, V. S. 
National Museum Cat. No. 43327. Holotype winged male on 
slide with tour other males and four females. 
28 PROC. ENT. SOC. WASH., VOL. 33, NO. 1, JAN., 1931 
Described from two females reared October 30, 1930, and a 
large series of females and males reared Nov. 12-14, 1930, by 
the writer from egg sacs of the "cul rouge" or "black widow" 
spider, Latrodectus mactans Fab. collected from beneath bee hives 
at Damien, Haiti. 
Ashmead in the description of the winged male of Bceus 
americanus How. and characterization of the genus, states that 
the male antenna is 12-jointed but with the male of B. latrodecti 
there are only eleven joints, the last being constricted somewhat 
to suggest a twelfth joint. 
Actual date of publication, February 9, 1931.