494 BULLETIN UNITPJD STATES GEOLOGICAL SURVEY. 



of their tarsus longer than tbe legs of the third pair. The four auterior 

 tibiai are without spiues; the anterior metatarsi have 1. 1. spines below ; 

 the tibise of the third pair have 2. 1. spines in front, 1. 1. behind, and 2. 

 2. 2. below. The abdomen is elongate, ovato-elliptical. The tndva con- 

 sists of a large flat area truncate in front, and with a fine lougitudinal 

 middle costa ; on each side, behind and near the margins, this area vuIvitb 

 shows a furrow and a fine costa close to each other, these costne being 

 curved inward and united with each other behind ; the area inclosed 

 by them is thus limited behind by a -^.^ -formed ridge, and is scarcely 

 broader than long, and but very slightly narrowing forward. Close to 

 each side of this area the margins of the whole area vulvae are gradu- 

 ally incrassated backward and curved inward, forming two large, low 

 tubercles behind the said smaller area. 



Color. — Cepludothorax black, with black hairs. Sternum^ mandihles, and 

 labium dark brown. MaxiUce dusky testaceous, darker in the middle, 

 pale at the apex. Pal2n blackish, with the femoral joint and the base of 

 the patellar joint dusky testaceous. Legs for the greatest part black, 

 yellowish at the base ; the coxa? are of a sooty, testaceous hue, black at 

 the apex above f the thighs are black, those of the first pair broadly tes- 

 taceous at the base on the inner side, and also, though less distinctly, on 

 the outer ; the following thighs are also more or less broadly andevidently 

 paler at the base ; the patellee are black at the apex, blackish testaceous 

 at the base; the black tibiae have two longitudinal blackish testaceous 

 lines above (less distinct on the posterior tibise) ; the tarsi and the an- 

 terior metatarsi are rusty-brown, the posterier metatarsi piceous. The 

 abdomen is black with brownish-black hairs, the belly grayish black ; 

 the pulmonary shields brownish-yellow, bordered with black; the area 

 vulvce is pale yellowish, with the posterior costse and tubercles piceous. 



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

 thorax 2i millim. Length of legs : I 7^, II 6f, III 6, lY 9i millim.; 

 patella -f tibia IV 2f millim. 



A single female was captured at Manitou, Colo., July 12. This spider 

 is no doubt closely allied to the European F. petiveri (Scop.) or P. sub- 

 terranea (C. L. Koch), but is, I think, a separate species. 



Section LATERIGEAD^E. 

 Fam. THOMISOID^E. 



Subfam. THOMISIN-cE. 



Gen. Xysticus (C. L. Koch), 1835. 



13. X. cimctafor n. 



Cephalothorax somewhat broader than long, as long as patella + 

 tibia of the first pair, brown, with a large whitish middle band, inclos- 

 ing a grayish-brown, rather obtuse, wedge-shaped patch in front and a 

 small triangular black line behind ; legs grayish-white, with a longitu- 



