510 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



part, the bulbus sends out, from its inner margin, a large tapering costa 

 (spine?), very broad at its base, directed outward and backward, curved 

 upward, and concealing its apex under the basis of the elevated poste- 

 rior part of the bulb ; outward, the anterior part of the bulbus is occu- 

 pied by a lamina truncated at the apex. 



The color of the cephalothorax and abdomen appears to be as in the 

 female. The mandibles are blackish, with dusky brownish-yellow streaks. 

 The maxillce and labium are also mostly blackish. The femoral joint of 

 the palpi is brownish-yellow, with black spots and streaks, especially 

 toward the base; the patellar joint is yellowish-brown, the tibial black 

 on the sides, pale brownish above, covered with black hair ; the tarsal 

 joint is black and black-haired, pale at the apex; the bulbus rusty-brown, 

 with the smallest of the three spines black, and the lamina of the low 

 anterior part pale, grayish. The legs are brownish-yellow ; the thighs 

 black beneath, except at the apex, and wifeh distinct blackish rings 

 above; the following joints are less distinctly ringed. 



Length of body 6, of cephalothorax a little more than 3 millim. ; 

 breadth of cephalothorax nearly 2^ millim. Legs : I nearly 10, II and 

 III 9J, IV 14 (?) millim. ; patella + tibia IV 3J millim. 



A male and a female example of this species were captured at George- 

 town, Colo. (9,500 feet above the level of the sea,) July 8; two other 

 females were found on the Blackhawk, Colorado, July 2, one on Mount 

 Gray, July 7, and one in Idaho, July 5. 



23. L. tristis n. 



Cephalothorax black, with a broad, rusty-brown, middle band strongly 

 constricted behind the eyes, and with a supramarginal row of rusty- 

 browu spots on each side; legs blackish, with rusty -brown streaks and 

 spots, and with two distinct rings of the same color, at least on the meta- 

 tarsi; legs of second and third pairs of equal length; fourth pair of 

 legs rather more than four times as long as cephalothorax ; abdomen 

 sooty black above, grayish beneath; vulva flask-shaped, its anterior 

 part forming an M; the posterior, much broader part, rounded at the 

 sides, consisting of two large deep foveae separated by a septum grad- 

 ually broader backward, and also continued along the anterior part, 

 forming its middle portion. — $ ad. Length about 7 millim. 



Female — CephalotJiorax shorter than patella + tibia of 'the fourth 

 pair, little, if at all, longer than these joints of the first pair together, 

 of moderate breadth, strongly rounded in the sides, with the sides of the 

 pars cephalica nearly perpendicular, and, when seen from in front, slightly 

 rounded; the back is between the posterior declivity and the hind, 

 most eyes very slightly concave longitudinally, the area between the 

 posterior eyes slightly convex and sloping. First row of eyes straight ; 

 these eyes appear to be of the same size ; the interval between the cen- 

 tral ones is scarcely as great as their diameter and much greater than the 

 interval between them and the lateral eyes of the row. The area of the 



