506 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



small whltish-^ray spots, or points, formed of grayish-white hair. The 

 belly is grayish-yellow, with small blackish spots, forming three more or 

 leas distinct longitudinal bauds converging backward; it is, like the 

 sternum, covered with whitish-gray hair. The vulva is pale brown, at 

 least sometimes blackish toward the lateral margins. 



Length of body 6J, of cephalothorax 3J millim.; breadth of cepha- 

 lothorax a little more than 2J millim. Length of legs; 1 10|, II and III 

 10, IV 14J millim.; patella + tibia IV 4i millim. 



A female specimen of this very distinct little Lycosa was captured at 

 Boulder, Colo., June 29; another at JManitou, Colo., July 12. 



21. L. concinna n. 



Cephalothorax black, with three longitudinal, narrow, pale bands, the 

 middle band dilated on the pars cephalica, the laterel ones continuous? 

 supermarginal, or geminated by a black line; sternum black ; legs pale 

 brown, with blackish spots or rings, at least on the posterior pairs, 

 the coxfe yellowish beneath ; abdomen blackish above (in the bottom), 

 with a longitudinal, lanceolate, pale brownish, black-edged band in front, 

 continued by two series of spots of the same color gradually converging 

 and uniting together toward the anus ; vulva consisting of an oblong, 

 deep corneous brown fovea, strongly narrowed in front and broadly 

 truncated behind, its posterior, much longer and broader, portion being 

 divided into two large fovese by a high plane septum with parallel sides 

 and thrice as long as broad. — 9 ad. Length about 7 millim. 



Female. — Cephalothorax somewhat shorter than patella -f tibia of the 

 fourth pair, longer than these joints of the first pair together, not very 

 high, rather narrow, with the sides of the pars cephalica almost perpen- 

 dicular, and, when seen from in front, slightly rounded ; seen in profile, 

 the back of the cephalothorax is, between the posterior declivity and 

 the hindmost eyes, not perfectly straight, but slightly concavated ; be- 

 tween the posterior eyes, it is sloping, but very slightly convex. First 

 row of eyes nearly straight, scarcely perceptibly curved downward ; the 

 central eyes of this row appear to be a little smaller than the laterals, and 

 are removed from each other by an interval fully as large as their diam- 

 eter, and evidently larger than the interval which separates them from 

 the lateral eyes. The area occupied by the four posterior eyes is slightly 

 longer than broad in front ; its hinder breadth exceeds the fore breadth 

 with at least the diameter of one of the largest eyes. The interval be- 

 tween the two eyes of the second row is slightly greater than their di- 

 ameter; the space between them and the hindmost eyes is dohble the 

 diameter of these latter. The mandibles are 2^-2^- times as long as 

 broad, slightly convex longitudinally toward the base. The legs are 

 rather short, fourth pair 4 times as long as cephalothorax, second and 

 third pairs of the same lengths. The four anterior tibise have 2. 2. 2. 

 spines beneath and 1. 1. spines in front, these spines not being very 

 long. The abdomen is inversely ovate. The corneous vulva consists of 



