THORELL ON ARANE/E OF COLORADO. 501 



much broader behind, shorter than broad behind; interval between the 

 central eyes greater than that between them and the laterals of the same 

 row ; abd omen nearly half again as long as broad ; vulva consisting of a 

 pale brownish depression, bordered on the sides by two nearly parallel 

 strong blackish costa?. — 9 ad. Length about 6 millira. 



Female. — Cephalothorax as long as the tibia of the second pair, shorter 

 than patella + tibia of the fourth pair, a little broader than long, strongly 

 rounded in the sides, also rounded in 'front, with the clypeus nearly half 

 as broad as the pars thoracica ; seen in profile, the cephalothorax is of 

 moderate height, with the posterior declivity rather steep and short, the 

 back then straight to the hind central eyes, the forehead between the 

 central eyes sloping: also the clypeus is sloping, and its height a little 

 greater than the length of the area occupied by tlie central eyes. Ster- 

 num broad, truncate in front. JEyes small, of nearly equal size, both the 

 rows curved moderately upward, the front row being a little more 

 strongly curved than the hind row. The lateral eyes of the front row 

 are scarcely, those of the hind row a little, larger than the central eyes 

 of the same row ; the area occupied by the central eyes is about half 

 a gain as broad behind as in front, its length being smaller than its breadth 

 behind and a little greater than its breadth in front. The interval 

 between the hind lateral and central eyes is smaller than that between 

 these latter, the interval between the fore lateral and central eyes, which 

 is not much greater than the diameter of an eye, is nearly double as 

 small as that between the fore centrals, and also smaller than the inter- 

 val between the fore lateral and the hind central eyes. The length of 

 the mandible s is scarcelj^ more than half again as great as the height of 

 the clypeus , and their thickness at the base is about that of the fore 

 tibife. The palpi are short and armed with several spines. The legs are 

 of the usual form ; the second i)air, which is the longest, is five times 

 as long as cephalothorax, the third pair is very nearly as long as the 

 fourth ; all the thighs, tibiae, and metatarsi are armed with several long 

 spines, and even the patellpe have one or two spines ; the spines on the 

 under part of the tibia? are 2. 2. 2. The abdomen is nearly half again as 

 long as broad, broadest between the middle and the apex, inversely 

 pentagono-ovate. The vulva consists of a rather small but very con- 

 spicuous depression a little longer than broad, and limited on the sides 

 by two parallel strong costie, curved a little inward at the apices. The 

 whole body is rather densely covered with fine appressed hair. 



Color. — Cephalothorax pale greenish along the middle, brownish-violet 

 on the sides ; these side-bands nearly as broad as the pale greenish mid- 

 dle band, which shows a less distinct, coarse, whitish V on the pars ceplui- 

 lica, behind. Sternum and parts of the mouth pale greenish or yellow- 

 ish. Palpi and legs pale greenish, the thighs, patelhe, tibise, and meta- 

 tarsi slightly violet at the extreme apex. The abdomen is of a pale 

 ■whitish or yellowish-green color, paler beneath ; it has two short, longi- 

 tudinal, nearly parallel, unequal, violet lines immediately above the 



