THORELL ON ARANEiE OF COLORADO. 485 



longer than broad, elliptical, shining, almost hairless, like the cephalo- 

 thorax ; the vulva appears to consist of a rather large low tubercle, 

 divided into three parts by a transverse angularly forward bent furrow 

 and a middle longitudinal furrow proceeding backward from the angle 

 of the former (?)., 



Color. — Ceplialotliorax yellowish-brown, the extreme lateral margins 

 blackish. When the animal is placed in water or in spirit of wine, it shows 

 three fine longitudinal blackish lines along the pars cephalica. Sternum 

 of a dark, sooty, testaceous hue. Mandibles yellowish-brown ; maxilke 

 and labium testaceous. Pa7j)i yellowish, with black bristles j legs yel- 

 lowish, with slight brownish or reddish tint. Abdomen dark brownish 

 or olivaceous gray, darker on the under part; the vulva brownish. 



Length of body 1?, of cephalothorax nearly 1 millim. ; length of legs I 

 nearly 3, of tibia + patella IV nearly 1 millim. 



A single somewhat mutilated example "was captured at Arapaho 

 Peak (11-12,000 feet above the level of the sea), July 7. By the arrange- 

 ment and relative sizes of its eyes, this species shows some transition to 

 Pholcomma Thor., in which genus, however, the lateral and especially 

 the hind central eyes are, compared with the small fore central eyes, 

 much larger than in U. strabo, and the hind central eyes contiguous 

 with the hind laterals. 



Gen. feTEATODA (Sund.), 1833. 

 G. S. distincta n. 



Cephalothorax reddish; legs reddish, with black rings; the thighs of 

 the fourth pair and all the tibiae and tarsi black at the apex, the ante- 

 rior thighs black, reddish at the base ; abdomen black or piceous, with 

 white markings; a broken band surrounding the anterior margin, a row 

 of 3-4 spots along the back, an oblique line on each side, and a short 

 transverse line in front of the mamillfe below ; first and fourth pair of 

 legs of the same length ; vulva nearly w-formed. — 9 ad. Length about 

 6 millim. 



Female. — Ceplialotliorax shorter than j)atella and tibia together of the 

 fourth pair, somewhat longer than broad, much narrowed anteriorly, 

 but slightly sinuated at the pars cephalica ; the pars thoracica strongly 

 and amply rounded in the sides, the j)ars cephalica small, narrowing 

 forward, with the forehead rounded and not half as broad as the pars 

 thoracica ; the surface is smooth and shining, the cephalic impressions 

 strong; besides them, there are three short shallow radiating depressions 

 on each side; the ordinary middle fovea is large and deep, situated 

 somewhat behind the centrum, just behind the coxfe of the second pair J 

 seen from the side, the cephalothorax is nearly horizontal in front of the 

 middle fovea, neither very high nor elevated anteriorly ; the clypeus is 

 broader than high, its height being about as great as the length of a 

 iue formed by three eyes of the front row; it has a strong transverse 

 depression under the front row of eyes, and is convex and somewhat 



