THOREL ON ARANE^ OF COLORADO. 4iJ5 



diuiil whitish line above, the auterior ones browaish above, with brown- 

 ish aud black points, their metatarsi iinoiacalace, the posterior legs 

 paler, with black spots formiug distinct transversal bauds above ; tibi?B 

 of the first pair with 2. 2. 2. 2., second with 2. 2. 2. 1. spines beneath ; 

 metatarsi of first and second pairs with 5 pairs of spines ; back of the 

 abdomen brown, with a very large grayish-white middle band, coarsely 

 dentated on the margins, behind ; vnlva consisting of a large black 

 ronnded fovea having a narrow septum along the middle. — 5 ad. 

 Length about 6J millitu. 



Female. — CephalotJiorax as long as patella -f tibia of the 1st pair, 

 slightly longer than broad, nearly truncate in front ; seen from the 

 side, its back between the posterior declivity and the hind central eyes 

 is rather strongly convex, less strongly convex and more slightly sloping 

 in front than behind ; it is strewed with coarse bristles, and has along, 

 strong, curved bristle on each side of the pars cephalica under the hind 

 central eyes ; the cly pens shows six bristles in the margin, and one in the 

 middle, somewhat above the margin. The area formed by the four cen- 

 tral eyes is evidently broader than long, rectangular, at least not broader 

 behind than in front. The sternum and parts of the mouth are of 

 the same form as in X crlstatus and other typical species of the 

 genus, strewed with hairs, the mandibles and palpi also with coarse 

 bristles. The legs of the first pair are thrice as long as cephalothorax, 

 evidently (with the length of their tarsus) longer than those of the 

 second pair ; the legs are all strewed with bristles, hairs, and spines, 

 the difference between spines and bristles not being always easy to 

 determine; the thighs have one spine above, the first pair, moreover, 

 two or three spines in front; the spines on the under part of the 

 anterior tibiae and metatarsi are rather strong ; the tibite of the 

 first pair have 2. 2. 2. 2. spines, those of the second pair 2. 2. 2. 1. 

 spines beneath; the four anterior metatarsi show, seen from beneath, 

 five i)airs of spines, the third pair belonging to the sides of th,e 

 joint, i. e., these metatarsi have 2. 2. 2. spines beneath, 1. in front, 

 and 1. behind. The abdomen is evidently longer than broad, but slightly 

 rounded; nearly truncated in front, gradually somewhat broader back- 

 ward to behind the middle, then triangularly tapering with rounded 

 sides, longitudinally wrinkled in the sides, transversely wrinkled on the 

 upper part, behind. The vulva consists of a very distinct, deep, almost 

 circular fovea ; it is but little longer than broad, strongly rounded in 

 front and in the sides, slightly tapering behind, bluntish at the apex, 

 and bordered by a narrow, rather high margin, which is not depressed 

 or open behind ; along the bottom of this fovea is seen a low, narrow, 

 slightly elevated septum, which is not dilated at the apex; in the bot- 

 tom of the fovea, there appears also to be a very short, low, longitudinal 

 costa close to the middle of the septum, on each side. 



Color. — The cephalothorax has along the middle a very broad band, 

 the breadth of this band being but a little smaller than that of the 



