THORELL ON ARANE^E OF COLORADO. 513 



(in front), somewhat longer tlian broad ; it gradnally goes over into the 

 liosterior part, which is longer than the anterior, at least double as 

 broad as this latter, about as broad as long, rounded in the sides, 

 broadly truncate behind. The vulva is, along its entire length, divided, 

 by a narrow septum, into two long, large fovete, open behind; this 

 septum is abruptly, but not very much dilated toward the middle ; its 

 anterior half has the form of a tine linear costa, the posterior half that 

 of a broader costa, scarcely perceptibly increasing in breadth back- 

 ward, about twice as long as broad, about as broad as the space which 

 separates it from the iucrassated, posterior, lateral margins of the vulva, 

 and provided with a fine longitudinal furrow; in the bottom of the 

 vulva, on each side of the septum, toward its hind extremity, is a 

 small rounded tubercle. 



Color. — The ceplialothorax is black, with a longitudinal, paler yellow- 

 ish-brown, middle band about as broad as the anterior thighs, reaching 

 at least to the pars cephalica, somewhat tapering backward, and gemi- 

 nated by a black line; above the lateral margins is a row of about 

 three yellowish-brown spots. The sternum is black ; the mandibles 

 blackish, with brownish-yellow spots. The palpi and legs are dark yel- 

 lowish-brown, with black rings ; the cosns are brownish beneath ; the 

 thighs black, with very distinct yellowish-brown spots, which, above, 

 have the form of two oblong patches, geminated by a black line, and a 

 spot on each side between them ; the patellae are blackish on the sides, 

 with a black line above ; the tWi'vx. and metatarsi have three black rings ; 

 the tarsi are black at the apex. The abdomen is blackish above and on 

 the sides, brownish beneath ; the vulva dark brown. The under part of 

 the body is rather thickly covered with grayish hair. 



Length of body 8, of cephalothorax nearly 4 millim.; breadth of 

 cephalothorax 3 millim. Legs: I 10^, II 10, II[ 10^, IV \^ millim.; 

 patella + tibia lY 4J millim. 



A single quite bare-rubbed female of this species was found at Denver, 

 Colo., July 10. 



25. L. impavida n. 



Cephalothorax black, (probably) clothed with rusty-brown hair; legs 

 black, with paler rings, the fourth pair about 4^ times as long as cephalo- 

 thorax, second and third pairs of equal lengths ; abdomen black, with 

 rusty-brown and whitish hair; vulva consisting of a transverse de- 

 pressed area, narrowing backward, and containing two outward-curved 

 costa', strongly diverging forward, and including, together with the 

 lateral margins of the vulva, two deep fovenc. — ? ad. Length about 

 9 millim. 



Female. — Ceplialotliorax much shorter than patella -f tibia of the 

 fourth pair, as long as patella + tibia of the first pair, rather broad, 

 strongly rounded in the sides, its breadth equaling the length of the 

 tibia of the fourth pair; the sides of the pars cephalica are slightly 



