THORELL ON ARANE.E OF COLORADO. 497 



rasty-browu band on each side ; legs dark brown, pale at the base, the 

 hinder pairs rather paler, with a black ring on the tibia and metatarsus ; 

 thighs of the first pair with one spine in front, the other thighs without 

 spines, anterior tibife with two, anterior metatarsi with three pairs of 

 strong spines beneath ; abdomen brownish above, mottled with black 

 spots and strewed with small spatulate bristles ; vulva consisting of a 

 little pale Y-shaped fovea bordered on each side behind by a brown tuber- 

 cle. — 9 ad. Length about 4 millim. 



Female. — Cephalothorax as broad as long, rather longer than patella + 

 tibia of the first or second pair, slightly rounded in front, finely and 

 equably coriaceous, thinly spread with small appressed bristles, the 

 clypeus being furnished with some strong club-shaped bristles. Seen in 

 profile, the cephalothorax is high, very steep behind, the back being per- 

 fectly straight to the hind central eyes, the forehead then sloping. The 

 front row of eyes is moderately curved upward, the hind row strongly 

 curved backward ; the area occupied by the central eyes, which are the 

 smallest of the eight and of nearly equal sizes, is longer than broad, 

 scarcely perceptibly broader behind than in front ; the interval between 

 the front and hind central eyes is greater than the height of the clypeus, 

 and much shorter than the interval between the hind central and hind 

 lateral eyes, which distance is nearly half again as great as that between 

 the two hind centrals ; the interval between the fore central eyes is 

 greater than that between them and the fore laterals, which are much 

 larger than the other eyes ; the interval between the two lateral eyes is 

 somewhat smaller than that between the fore and hind centrals. The 

 sternum is nearly ovate, smooth and hairy, as are also the maxillce and 

 labium; the mandibles are coriaceous and provided with some bristles; 

 their length is at least double as great as the height of the clypeus. The 

 palpi are clothed with bristles, of which some are blunt and even clavate. 

 The thighs of the first pair have a blunt spine or coarse bristle in front ; 

 the other thighs appear to be unarmed ; the tibite have above a coarse 

 and blunt upturned bristle; on the under part, the four anterior tibiae 

 are armed with 2. 2. long and strong spines; the four anterior metatarsi 

 have 2. 2. 2. such spines on the under part, the last apical pair, however, 

 situated rather on the sides of the joint. The abdomen is somewhat 

 broader than long, truncate in front, gradually dilated backward to be- 

 hind the middle, then narrowing with rounded sides, and rounded 

 behind; it is thinly spread with spatulate bristles; in front of the ma- 

 millfe, the belly is sprinkled with hairs of the ordinary form. The vulva 

 consists of a small Y-shaped depression (the fore margin of the vulva 

 having the form of a triangular lobe) bordered behind by two tubercles, 

 one on each side. 



Color. — Cephalothorax blackish-brown, with a longitudinal middle band, 

 which is as broad in front as the clypeus, narrowing backward, and of 

 a pale rusty-brown color, with darker si)ots on the pars cephalica and 

 a blackish line along the middle of the pars thoracica ; the sides have 



