518 BULLETIN UNITED STATES GEOLOGICAL SURVEY, 



row ia front as behind, with a. very broad septam, which is rather 

 gradually narrowing forward, flat, and provided with a broad shallow 

 longitudinal middle furrow above. — $ 9 ad. Length about 9-11 millim. 



Female — Cephalothorax broad and strongly rounded at the sides, some- 

 what shorter than tibia + patella of the fourth pair, somewhat longer 

 than these joints of the first pair : its breadth equaling the length of 

 the tibia of the fourth pair; seen in profile, the back, between the hind 

 declivity and the eyes, is rather strongly concave, the area of the 

 posterior eyes convex and sloping; the sides of the pars cephalica are 

 somewhat sloping and slightly rouuded. The first row of eyes, which 

 eyes are of very nearly the same size, is straight ; the space between 

 the two central eyes of this row is somewhat larger than that between 

 them and the laterals, and not fully as great as the diameter of an eye. 

 The area occupied by the four posterior eyes is but little longer than 

 broad in front, much broader behind ; the interval between the two 

 largest eyes is half again as great as their diameter, the interval be- 

 tween them and the hindmost eyes about double as great as the diam- 

 eter of these latter. The mandibles are nearly as thick as the anterior 

 thighs, about 2^- times as long as broad at the base; the claw-furrow 

 has three teeth behind*and two in front. The legs are rather short, the 

 fourth pair being scarcely four times as long as the cephalothorax ; the 

 third pair appears to be slightly longer than both the first and the sec- 

 ond pairs, which are very nearly of the same lengths ; the anterior tibiae 

 have 2. 2. 2. spines beneath, 1. 1. in front, and 1. 1. behind ; in the tibise 

 of the first pair, however, the anterior lateral spines are placed very 

 low, and might be considered as belonging to the under part of the joint. 

 Abdomen inversely egg-shaped ; the vulva is a large oblong fovea about 

 double as broad behind as in front, but very slightly increasing in 

 breadth backward from the fore extremity nearly to the middle, then 

 rather strongly dilated, with rounded sides, and at last slightly narrow- 

 ing, broadly truncate behind ; it is bordered at the sides by a sharp edge, 

 which is incrassated at the posterior extremity; all along the vulva is 

 extended an elevated broad septum, gradually somewhat broader back- 

 ward, especially in its hinder longer jjart, flat above, with a longitudi- 

 nal, broad, shallow, middle furrow ; it fills up the space between the 

 lateral margins of the vulva at its hind extremity, and is much broader 

 than the deeper part of the vulva on each side, aud about three times 

 as long as broad at the hind extremity, where it is not fully double as 

 broad as at its apex (in front). 



Color. — The whole animal is black (covered with long black hairs), 

 with exception of the mandibles, palpi, and legs showing traces of yel- 

 lowish-brown streaks and patches. The coxse are paler on the under 

 side at the base ; the thighs have above, at the apex and (less distinctly) 

 at the base, a pale geminated patch, the anterior thighs moreover a pale 

 line along the outer side ; the posterior thighs are pale at the apex ; the 



