THORELL ON ARANE.E OF COLORADO. 507 



a large deep fovea, narrow in front, then gradually and strongly dilated, 

 at last somewhat narrowing backward, and limited by a sharp margin, 

 which is strongly elevated in front, lower behind; the anterior, narrow 

 I)art of this fovea is rounded at the apex, with nearly parallel sides, 

 not much longer than broad ; the posterior or principal part is at least 

 as broad as long, about three times as broad and long as the anterior 

 part, somewhat rounded in the sides, broadly truncated behind ; all 

 along the middle, it has a high, broad, prismatical septum, with almost 

 parallel sides, about three times as long as broad, nearly as broad as 

 the two deep oblong foveie into which it divides the vulva ; this septum 

 is shortly pointed in front, and there produced as a fine costa along the 

 bottom of the anterior part of the vulva ; at the truncated posterior 

 apex, behind, it shows two small and slight depressions, above it is 

 plane, with two scarcely perceptible longitudinal furrows. 



Color. — Ce2>/taZo^/wraj; blackish, with three longitudinal pale bands, cov- 

 ered with brownish or whitish-gray hair ; the middle band is on the pars 

 thoracica at least as broad as the tibi?e of the first pair, slightly taper- 

 ing backward, and geminated by a fine black line in front ; at the pars 

 cephalica it is suddenly dilated and continued forward between the 

 posterior eyes, filling up the area between them, and here nearly double 

 as broad as on the pars thoracica. The lateral bands are supramarginal, 

 continuous, but uneven in the margins, narrow, and separated from the 

 edge of the cephalothorax, which is also covered with grayish-white 

 hair, by a blackish-brown line, so that the bands may also be said to be 

 marginal and geminated. The sternum is black, and covered with gray- 

 ish-white hair. The mandibles are dark brown ; maxillcv and labium 

 yellowish, the former brown along the middle toward the base, the 

 latter brown at the base. Palpi and legs of a pale brown hue, the coxae 

 yellowish beneath ; the posterior legs are rather distinctly but not 

 densely black-ringed ; the anterior legs have distinct blackish spots or 

 rings only on the upper part of the thighs. The abdomen is above 

 blackish, with averj^stronglymarked,lanceolate, pale brown, black-edged, 

 band on its anterior half, and two converging series of rather large 

 spots of the same color behind, reaching from the sides of the band to 

 the anus and gradually melting together as they approach the anus ; 

 moreover, the back appears to be mottled with black and grayish-white 

 spots, and to have a row of small grayish-white points on either side 

 behind. The belly is grayish-brown, and covered with grayish hair. 

 The vulva is dark brown, the mamillcc black. 



Length of body 7, of cephalothorax 3i millim. ; breadth of cephalo 

 thorax at least 2.^ millim. Length of legs': 1 9i, II and III 9i, IV 13 mil- 

 lim.; patella + tibia IV 3i| millim. 



The only example contained in the collection is a rather bare-rubbed 

 female captured at Kelso Cabin, Colo., July G. The species much resem- 

 bles the European L. montlcola (Clerck) and several others of the same 

 group, but the vulva is entirely different, and also the central pa!e 

 band of the cephalothorax is of another form than in that species. 

 2L H B 



