Pomona College, Claremont, California 9 
anterior femora armed beneath with a double series of numerous stout spines, and the 
abdomen broadly triangular-oval in outline (Neoscona in part.) In coloration it 
differs from A. utahana Chamb., e. g., in having the anterior tibie and metatarsi only 
biannulate instead of triannulate, the median annulus being absent, while the femora 
have an annulus only at the distal end. In the type the carapace is somewhat dark- 
ened in a median longitudinal stripe and may have been blackish in life. Thorax 
blackish at sides. Abdomen in general light yellowish; on posterior portion above a 
black line with posterior end bifurcating, and a black line on each side also running 
caudad from anterior end of the median line; on sides a series of brownish, parallel, 
subvertical lines; venter not unusually black as it is in utahana. The scape of the 
epigynum instead of curving evenly with convexity ventrad, is straight to the distal 
end which is bent abruptly ventrad instead of curving dorsad as in vertebrata. ‘This 
bending may in part be an artifact as the abdomen in the type was shrunken firmly 
against the end of the scape. See pl. 6, f. 6. 
Length, 14 mm. Length of abdomen, 11.5 mm.; width, 9.6 mm. Length of 
cephalothorax, 6.6 mm. Length of tib.-+ pat. I, 7.2 min.; of tib.-+ pat. IV, 6.5 mm. 
Type—M. C. Z. 388. Cal.: Desert region. 
THOMISID = 
Thanatus retentus sp. nov. 
Female—Carapace with a chocolate colored band on each side above a pale 
marginal stripe, with a broad median dorsal pale stripe embracing typically a darker 
median longitudinal mark which bifurcates at the posterior border of head and is 
continued forward as interrupted dark lines, a median dark line also present betweeen 
these branches. Lower median region of clypeus pale. Sternum yellow, densely dotted 
over borders, or sometimes over entire surface, with minute dark spots. Legs brown, 
lined and mottled with black, the joints showing some clearer longitudinal lines par- 
ticularly on the femora. Abdomen above yellowish with a dark colored basal sagittate 
mark reaching to middle or indistinctly continued beyond in an interrupted median 
line; on posterior region a dark area showing several chevron marks united on each 
side in a line or band with wavy exterior edge; typically the venter shows two 
narrowly separated median black lines united in an acute angle in front of spinnerets 
and ectad of this on each side another dark line. Posterior row of eyes strongly 
recurved, as usual, the median eyes scarcely nearer to each other than to the laterals 
(cir. 14:15). Area of median eyes narrower in front than behind, longer than wide 
in about ratio 20:17. Anterior medians twice as far from each other as from the 
laterals. Epigynum as shown in pl. 6, f. 5. 
Type—M. C. Z. 389. 
Claremont. A common species in this region. 
This form is readily distinguishable from coloradensis, with which it has hereto- 
fore been confused, by the obviously different form of the epigynum. 
AGELENID® 
Agelena rua sp. nov. 
Male—Carapace with the sides dark, as usual, the median band yellow. Sternum 
dusky over yellow with a clear median longitudinal line. Legs light yellow, obscurely 
