522 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



of the face much greater than half the length of the mandibles. The 

 front row of eyes is evidently shorter than the second row, curved 

 downward; its central eyes are larger than the laterals, and separated 

 by an interval that is smaller than the diameter of these eyes, and but 

 little greater than that which separates them from the fore laterals. 

 The area occupied by the four posterior eyes is scarcely longer than 

 broad in front, not much (only with about the diameter of one of the 

 hindmost eyes) broader behind than in front ; the two eyes of the 

 second row are very large, separated by an interval much smaller than 

 their diameter; the interval between them and the hindmost eyes is 

 little more than half again as great as the diameter of these latter eyes. 

 Mandibles little, if at all, longer than the tarsi of the first pair, not quite 

 as thick as the fore thighs, little more than double as long as broad. 

 The legs are long and rather slender, the first pair rather more than 

 four times as long as cephalothoras ; the spines are tolerably short ; 

 the anterior tibiee have 2. 2. 2. spines beneath, and moreover 1. (first 

 pair) or 1. 1. (second pair) spines in front. The vulva is a rather large 

 oblong fovea (as long as the diameter of the posterior thighs), rather 

 narrow in front, with the apex rounded, broadly truncate behind, but 

 slightly increasing in breadth backward in the first fourth part of its 

 length, then somewhat more rapidly but not strongly broader to much 

 behind the middle, with slightly rounded sides, at least in the hindmost 

 fourth part, rapidly and strongly dilated, with the sides obliquely 

 rounded ; the sides of the vulva are thus twice sinuated. The sharp 

 lateral edges of the vulva are incrassated at their posterior end, out- 

 ward ; all along the vulva is a rather narrow and low septum, somewhat 

 incrassated toward the middle; at its hind, more elevated extremity, it 

 is suddenly dilated on each side into a transverse costa, very slightly 

 curved forward at the rounded extremity, which is received in the 

 hindmost broadest part of the vulva ; the septum thus forms an anchor, 

 or a _L, the transverse bar of which is somewhat shorter and stronger 

 than the longitudinal bar. 



Color. — Cephalothorax black, with three longitudinal pale brown bands 

 covered with grayish-white hair, the middle grayish-white band thus 

 formed being as broad as the fore thighs, and continued all along the 

 back, with nearly parallel sides, the lateral bands marginal, narrower, 

 as broad as the fore tibise, geminated by a brownish line; the sides of 

 the cephalothorax between the bauds are clothed with brown or black- 

 ish hair, sternum black, covered with more appressed grayish and 

 more erect black hairs. Mandibles black, with grayish hair, at least on 

 their basal half, black-haired toward the apex. Maxillce and labium 

 dark brown, paler at the apex. Palpi and legs yellowish, covered with 

 fine appressed whitish hair as also with longer black hairs ; the spines 

 mostly brownish ; the posterior tibiie and metatarsi have two blackish 

 rings, the posterior thighs show tracas of one or more blackish spots. 

 Abdomen blackish above, paler on the sides; the belly is deep black 



