100 ENTOMOLOGICAL SOCIETY 
points; venter wholly pale. Structure similar to H. pikei, but more 
robust; cephalothorax rather broader; leg i heavy, 4-4 spines under 
tibia i, and one above base of first of inner series, one spine on inner 
side of patella i, and three in a transverse row near tip of femur i; hind 
metatarsi spined only at tip, and tibia iv with but one sub-basal and 
an apical pair below. Abdomen about four times as long as broad> 
truncate at base, with crest of hairs, sides sub-parallel. 
Length 8.5 mm. 
One female from Arizona (Townsend). 
Plexippus mttatus, n. sp. 
Cephalothorax pale yellowish brown, eye-region blackish, rather paler 
in middle, a row of about ten curved black bristles below side of eye 
region, much short white hair around eyes; clypeus pale yellowish brown, 
as also mandibles, palpi, and legs, on the under side of femur i near 
tip are two short transverse black bars; sternum and venter pale; dorsum 
of abdomen with a straight jet-black stripe each side from base to tip } 
and between them a broad stripe of white. The structure is similar to 
P. paykulli in many respects; leg i is plainly thicker than others, and 
rather long, there are 4-4 spines under tibia i and one above base of 
first of inner series, one on inner side of patella i, and five or six above 
toward tip of femur; tibiae and metatarsi iii and iv have long spines 
near base and middle as well as at tip. Abdomen about three times as 
long as broad. 
Length 9 mm. 
Female from Arizona (Townsend). 
EXPLANATION OF PLATE II. 
Fig. i. Gonglydium kincaidi, male palpus. 
2. Bathyphantes pacifica, male palpus. 
3. Bathyphantes pacifica, male palpus. 
4. Exechophysis palustris, male palpus. 
5. Hyctia robusta, vulva. 
6. Plexippus mttatus, vulva. 
7. Gonglydium kincaidi, male palpus. 
8. Exechophysis palustris, head of male. 
9. Exechophysis palustris, male palpus. 
10. Exechophysis nigriceps, side view of male, 
ii. Exechophysis nigriceps, male palpus. 
12. Tmeticus armatus, male palpus and mandible. 
13. Pellenes formosus, patella iii of male. 
14. Pellenes formosus, male palpus. 
15. Crustulina pallipes, vulva. 
1 6. Bathyphantes pacifica, vulva. 
