THORELL ON ARANE^ OF COLORADO. 527 



sbow a somewhat larger tooth at the apex above ; the following joints 

 are furnished with fine hairs. The metatarsi are all provided with sev- 

 eral distinct false articulations. 



Color. — The upper part of the hody is blackish or brownish, very 

 densely mottled with small yellowish or grayish spots, which on the 

 sides of the abdomen are more regularly rounded (in general, with a 

 black point in the middle), but more inward, often meet together into 

 irregular patches or transverse bands, thus giving the back a yellowish 

 ground-color, with black markings. The first ce^phaloilioracic segment 

 is more yellowish toward the sides, black in the middle, with a longi- 

 tudinal yellowish middle line stretching from behind the eye-eminence 

 to the frontal margin, and forked anteriorly, the eye-eminence and the 

 frontal tubercles thus being yellow above, dark on the sides j their teeth 

 are also yellowish, with dark tips. In the furrow between the frontal 

 tubercles are two small, parallel, blackish lines. Behind the eye-emi- 

 nence, the back shows two rows of black spots, forming two in general 

 very distinct longitudinal parallel lines or bands, which stretch along 

 two-thirds of the length of the body, or nearly so, and are continued 

 posteriorly each by a few pale yellowish or whitish spots or streaks. 

 The under part is paler, mottled with blackish and grayish or brownish- 

 white. The mandibles are grayish-yellow, with a brownish or blackish 

 patch above on the first article, and with short, oblique, brownish 

 streaks in the sides ; their fingers are black at the apex. The 'palj^i have 

 the patellar and tibial joints brownish, the tarsal joint and the base of 

 the femoral joint grayish-yellow. The legs are of a dull or grayish- 

 brown hue, with the coxae and trochanters paler brownish or whitish. 

 The patellte and the tibice have a broad, blackish ring at the apex, and 

 also the thighs are more or less distinctly darkened at the extremity. 



The male differs by having the j;a?^* somewhat thicker in the middle, 

 the tibial joint being a little thicker than the patellar, and not cylindrical 

 but evidently narrowing forward, and not fully two and a half times as 

 long as broad. The femoral joint is provided with several stronger 

 teeth along the outer side ; the tarsal joint is curved downward, and, 

 seen in profile, somewhat thickened toward the base and the apex. 

 The palpi are in general pure black, only with the tarsal joint brownish- 

 yellow. The shaft of the ijenis is rather broad and flattened, suddenly 

 narrowed near the apex. The apical joint, which scarcely forms an 

 angle with the shaft, is about double as long as broad at the base, not 

 half as broad as the principal part of the shaft, but nearly as broad as 

 its apex. It is tapering toward the apex, and, when seen in profile, 

 truncated at the apex, which is provided with a fine spine, forming a 

 very obtuse angle with the joint, and directed somewhat upward. 



9. — Length of body 7 millim.; breadth of same 3f millim.; length 

 of second joint of mandibles li, of palpi nearly 3^ niiim. Legs: I 

 111 (tliigh 3f ), II 33, III 18^, IV"2G^ millim. 



S. — Length of body 5i millim.; breadth of same 3 millim.; length of 



