THORELL ON ARANE^ OF COLORADO. 523 



behind the rima genitalis, and of a sooty-yellowish color in front of the 

 rima; the back has two backward-converging rows of brownish-yellow 

 spots along the middle, the two first spots more nearly together than 

 the two next following, and more or less distinctly united with each 

 other and (perhaps) with these latter, forming with them a trapezium 

 broader behind ; the second and third pairs form a trapezium slightly 

 broader in front, the following four or five pairs are gradually more and 

 more approximating. The back appears to be covered and mottled 

 ■with pale brownish-gray hair, forming a broad, somewhat lanceolate 

 band along the middle, and is more black-haired on the sides ; the sides 

 of the abdomen are clothed with grayish hair, the belly is black-haired. 

 The vulva is yellowish, with the extremities of the transverse bar of 

 the septum black. Mamillce brownish-yellow. 



Length of body 11^, of cephalothorax 5J millim. ; breadth of cephalo- 

 thorax 3|, of clypeus 2^ millim. ; length of mandibles 2^, of legs : 1 16, 

 II 151, III 15, IV 20^ ; patella -f tibia IV 6, tibia IV 4i. 



The collection includes two examples of this species captured in Col- 

 orado, July 13 5 the one a full-grown female found in the " Garden of 

 the Gods ", the other a very young female captured at Manitou Springs. 



Section SATTIGRAD^. 

 Fam. ATTOID^. 



Gen. Phidippus (C. L. Koch), 1846. 



30. Fh. coloradensis n. 



Cephalothorax black, with whitish-gray hairs, especially on the sides 

 of the pars cephalica and the clypeus ; eye-rings grayish-white, the long 

 hairs of the margin of the clypeus whitish ; palpi brownish-yellow ; 

 legs black; abdomen black on the sides, orange-red above, with a longi- 

 tudinal broad dark greenish middle band along the posterior two-thirds 

 of its length, and with a spot of the same color in front of this bandj 

 vulva consisting of a rather large deep transverse fovea, behind which 

 is seen another small fovea. — $ ad. Length about 14 millim. 



Female. — Cephalothorax very high, not much longer than broad, with the 

 posterior declivity very steep, seen in profile somewhat concavated and 

 nearly as long as the rest of the back, which is somewhat sloping, and 

 convex between the eyes. The cephalothorax is broadest rather far 

 behind the hindmost eyes, slightly narrowing forward and backward, 

 with the sides rather equally rounded ; the forehead is somewhat rounded, 

 its breadth being somewhat more than two-thirds of the greatest breadth 

 of the cephalothorax ; the pars cephalica is almost flat above, trans- 

 versally limited behind by a shallow depression. The interval between 

 the margin of the clypeus and the fore central eyes is less than half 

 their diameter. The length of the eye-quadrangle is slightly greater 

 than one-third of the length of the cephalothorax; it is broader behind 

 22 H B 



