Sarah E. Jones.
Description of Habrocestum parvulum (Banks).
Psyche 53(1-2):27-29, 1946.

This article at Hindawi Publishing: https://doi.org/10.1155/1946/67480
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Habrocestum parvulum
DESCRIPTION OF HABROCESTUM PARVULUM
(BANKS)
SARAH E. JONES
Texas State College for Women
Discovery of a male Habrocestum parvulum (Banks) taken from William Trelease Woods, University of Illinois, on Sept. 2 5, 1939, and two females, taken on Sept. 16, 1944, and Jan. 14, 1945, led to examination of the specimens in the collection in the Museum of Comparative Zoology, Harvard University. The male holotype is redescribed, and the female is described for the first time.
Male. Length 3.25 mm.; ceph. 1.75 mm. long, 1.25 mm. wide; abd. 1.5 mm. long; cephalothomx brown, ocular area darker with a posterior median emargination in dark area; lighter band across thorax behind eyes, and radiating dark lines on thorax; margin black; clypeus brown, darker around eyes, where are short white hairs; white hairs above anterior eye row and scattered over cephalothorax, which is high, sloping slightly forward and strongly backward from hind third, widest behind last eyes, with sides almost parallel; clypeus sloping posteriorly, one-half as wide as anterior median eyes; eyes, ant. row bulg- ing, slightly recurved by posterior margins, medians almost twice the diameter of laterals, second row slightly nearer hind row, which is narrower than thorax; quadrangle one-fourth wider than long, narrower behind, occupying less than one-half of cephalothorax; sternum pale, longer than wide, with cox% I separated by more than width of labium, cox= IV contiguous; labium pale, as long as wide; mandibles reddish, paler below, with one tooth on lower fang groove, none above; abdomen cream, with narrow oblique black lines laterally, leaving a pale line bordering abdomen anteriorly and passing back laterally to hind third of abdomen; on dorsum are three pairs of light spots, the first two confluent; posteriorly are four light cross- bars and a light spot above the pale spinnerets; venter pale, Published by a grant from the Museum of Comparative Zoology at Har- vard College.
Pu&e 53:27-29 (1946). hup ttpsychu einclub org/S3/53-027.htd



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28 Psyche [March-June
with a median longitudinal band and a pair of crescentic lateral lines black; legs (removed from holotype, and described from male taken with female allotype) brown, first pair darker, FIG. 1. Dorsum of male abdomen. FIG. 3. Male palp, lateral view. FIG. 2. Epigynum.
FIG. 4. Male palp, ventral view.
black on patella and tibia, with last two joints light, 4-3-1-2; spines, I pair, tibia, ventral, 2-2-2, prolateral, 1 distal, meta- tarsus, ventral, 2-2, twice the diameter of the joint; I1 pair, tibia, ventral, 1-2-2, prolateral, 1 distal, metatarsus as in I pair, no dorsal basal spine on last two pairs of tibiae; palp black, patella slightly longer than tibia, which is slightly longer than



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19461 Habrocestum parvdum 29
wide, and longer dorsally than ventrally; apophysis short, hooked inward; embolus almost straight; bulb projecting ven- trally and extending well over tibia.
Female. Length 3.5 mm.; ceph. 2.0 mm. long, 1.5 mm. wide; abd. 1.75 mm. long; cephalothorax colored as in male, but eye area black, transverse line behind eyes more distinct, and no radiating lines on thorax; hairs as in male, with also dark hairs above anterior eye row, longest between anterior eyes and be- low middle eye row; eyes, sternum, labium, and mandibles as in male; abdomen pale, mottled with black forming thin longi- tudinal lateral lines, dorsum with a large pair of light spots on anterior edge, two smaller pairs at mid-length, and four light cross-bars posteriorly; venter as in male; legs brown, 4-3-1-2, spines as in male; palp brown, outer two joints slightly swollen, with long stiff hairs ventrally and medially; epigynum with large median droplet-shaped spermathecs and smaller lateral vulval openings.
Holotype, Ithaca, N. Y. (N. Banks Collection). Allotype, Ithaca, N. Y ., May 2 1, 19 1 1. Coy Glen (N. Banks Collection). Taken with the allotype were one male and three immature specimens.
In the male from Illinois the cephalothoracic colors are more sharply contrasted than in the types. The male tibia1 apophysis is less blunt than in H. pulex (Hentz) ; the bulb protrudes as much posteriorly as in pulex, and much farther ventrally; and the embolus is less whorled than in pulex. The epigynum is dis- tinctive in having the spermathecs medial to the vulval open- ings.




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