THORELL ON AEANE^ OF COLORADO. 519 



patellar are pale above, with a fine black line ; the tibiae have two broad 

 pale lines above ; the metatarsi are pale at the very base, with traces of 

 a broad brownish ring; all these markings, however, very dull and 

 rather indistinct. The bellj^ is grayish-black, the vulva is dark brown, 

 its septum rusty-brown, paler along the middle. 



9. — Length of body 11, of cephalothorax 4J millim.; breath of cepha- 

 lothorax nearly 3.^ millim. Length : of legs I nearly 12J, II 12, III 12^, 

 TV 17^ millim.; patella _[_ tibia IV 4f millim. 



Male. — The male differs little from the female. The cephalothorax is 

 slightly longer than patella + tibia of the first pair; its breadth is as great 

 as the length of the tibia of the fourth pair; the space between the central 

 eyes of the first row is about as great as their diameter, and that between 

 the two largest eyes not very much greater than the diameter of one of 

 these latter eyes; the wawrZi&Zes are narrow, scarcely thicker than the fore 

 patellar, the legs slightly longer than in the female. Tlho, palpi are rather 

 thick and short ; the patellar joint, seen from above, is at least as long 

 as the tibial joint, which is slightly and gradually dilated toward the 

 apex, slightly longer than broad, thickly covered with long hairs; the 

 tarsal joint is as long as (not longer than) the two preceding joints 

 together, scarcely more than half again as long as broad, and as broad 

 as the anterior thighs. The genital bulb is very high behind, deeply 

 and transversely excavated in front of this elevated portion, which, seen 

 from the inner side, is truncate at the tip, sloping behind and in front ; 

 the tip of this portion is occupied by a large transverse fovea, from 

 which proceeds a very coarse, uneven, forward- and slightly outward- 

 directed tooth (very prominent when the bulb is seen in profile) ; from 

 the base of this tooth, along the bottom of the fovea, proceeds a spine, 

 the free downward-turned point of which is easily seen when the bulb 

 is viewed obliquely from the outer side and from beneath ; from the 

 middle of the inner margin of the bulb, close to the posterior elevated 

 portion, but divided from it by an opening at the base, proceeds a 

 transversely outward- and backward-curved spine-like costa, rather 

 broad at the base ; at the outer margin, toward the middle, is a strong 

 downward-directed tooth, slightly curved forward. 



The color is the same as in the female, except that the palpi are 

 totally black, black-haired, with only the patellar joint slightly paler 

 above, and the bulbus brownish with black spines and teeth ; the pale 

 markings of the legs are still less distinct than in the female. 



(?. — Length of body 9i, of cephalothorax IJ millim.; breadth of cepha- 

 lothorax nearly 3| millim. Length of legs : I 13, II 13, III 13^, lY 17f 

 millim. ; patella -\- tibia IV 5 millim. 



Several examples of this species (most of them not fully developed) 

 were captured on Gray's Peak (at about 12,000 and even at 14,000 feet 

 above the level of the sea), July 7, as also at Arapaho Peak, Colorado, 

 (11-12,000 feet), July 1. 



