THORELL ON ARANE^E OF COLORADO. 521 



Color. — Geplialothorax browu, with a broad, pale browD, middle band 

 reaching to the hindmost eyes ; it is covered with fine appressed hair, 

 darker on the sides, paler along the middle, and forming a brownish- 

 gray band with nearly parallel sides extending along the whole back of 

 the cephalothorax, and being as broad as the area of the posterior eyes ; 

 also the lateral margins of the cephalothorax are paler, and their ex- 

 treme edge is covered with pale brownish-gray hair. Sternum brownish- 

 black, strewed with black erect hairs. Mandibles brownish-black, cov- 

 ered with brownish-gray hair on their basal half, black-haired toward 

 the apex. Maxilkc and labium piceous, paler at the apex. Palpi and 

 legs brown, covered with fine, appressed, brownish-gray hair, strewed with 

 longer black hairs, and armed with black or brownish spines; the under 

 part of the coxic is brownish-black and black-haired, paler at the very 

 base; the thighs, at least the posterior ones, are rather indistinctly black- 

 spotted on the sides. The abdomen is brownish-black, the back densely 

 covered with blackish- or grayish-brown hair, and strewed with longer 

 more erect black hairs; the belly is blackish and black-haired, the vulva 

 dark brown. 



Length of body 12, of cephalothorax 6^ millim.; breadth of cephalo- 

 thorax 4f, of clypeus 2| millim. Length of mandibles nearly 3 millim.; 

 of legs: I 15.J, II 14f, III 14J, IV 19:} millim.; patella + tibia lY 6 

 millim. 



A single adult female of this species, which is closely allied to the 

 Euroi^ean T. inquilina (Olerck), was found on the Blackhawk, Colorado, 

 July 12. 



29. T. scalar is n. 



Cephalothorax shorter than patella -f tibia of the fourth pair, black- 

 ish, with three longitudinal pale bands all along the back and the sides, 

 the middle band being as broad as the thighs, the narrower marginal 

 bands geminated ; legs yellowish, the posterior tibite and metatarsi 

 black-ringed; fourth pair of legs about four times as long as cephalo- 

 thorax; abdomen black above, with two rows of brownish-yellow spots 

 along the middle, and here covered with pale brownish gray hair ; belly 

 deep black behind the rima genitalis ; vulva consisting of an oblong 

 rather large fovea, increasing in breadth backward, with sinuated sides, 

 and with a septum having the form of an anchor, or a _L, the transverse 

 bar of which is somewhat shorter and stronger than the longitudinal 

 bar. — 9 ad. Length about Hi millim. 



Female. — Cephalothorax of moderate breadth, not very strongly rounded 

 in the sides, somewhat shorter than patella -\- tibia of the fourth pair, 

 as long as patella -f tibia of the first pair ; its breadth is somewhat less 

 than the length of tibia of the fourth pair, the breadth of the clyp- 

 eus equaling j of the greatest breadth of the pars thoracica; the back 

 is straight behind the posterior declivity and the ejes; the sides of 

 the pars cephalica are moderately sloping, slightly rounded, the height 



