508 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



22. L. uncata n. 



Cephalothorax blackish, with a pale, rather broad, longitudinal, middle 

 band covered with grayish- white hair 5 sternum black or brown; legs 

 brownish-yellow, with blackish rings, second and third pairs of equal 

 length, fourth pair more than four times as long as cephalothorax ; 

 abdomen blackish, with a broad, longitudinal, pale band, or area, covered 

 with grayish-white hair, and with two rows of small spots of the same 

 color ; tibial joint of the male palpi black on the sides, pale brownish 

 above, covered with black hair; tarsal joint black, pale at the apex ; 

 bulbus very high at^the base, and there armed with two spines, one very 

 long, curved upward and directed forward and outward, the other 

 directed downward and outward; vulva forming an oblong pale area, 

 narrow in front, and there provided with two longitudinal furrows, 

 strongly dilated and rounded on each side, behind, and here bordered 

 by a brown margin. — $ 5 ad. Length of ? 7-8, of $ about 6 millim. 



Female. — Cephalothorax shorter than patella + tibia of the fourth pair, 

 nearly as long as patella + tibia of the first pair, of moderate breadth, 

 rather strongly rounded in the sides, and with the sides of the pars 

 cephalica nearly perpendicular; seen in profile, the back is nearly 

 straight, but very slightly coneavated between the posterior declivity 

 and the hindmost eyes, slightly sloping and convex between the poste- 

 rior eyes. The front row of eyes is much shorter than the middle one, 

 very slightly curved downward; the eyes of this row are very nearly 

 of the same size, the interval between the central ones being as great 

 as their diameter, and greater than the interval between them and the 

 laterals. The area occupied by the four posterior eyes is little longer 

 than broad in front, with more than the diameter of one of the largest 

 eyes broader behind than in front; the space between the two largest 

 eyes is evidently greater than their diameter, the space between them 

 and the hindmost eyes double as great as the diameter of these latter. 

 Mandibles as long as the tarsi of the first pair, their claw-furrow armed 

 with three pointed, rather small teeth on the posterior, and with two 

 teeth on the anterior margin, the innermost of these latter teeth being 

 very small. The fourth pair of legs is about 4J times as long as the 

 cephalothorax; the second pair are scarcely longer than the third. The 

 tibiie of the first pair have 4 pairs of spines beneath, the apical pair being 

 short, the third pair placed a little higher up than the others, and they 

 have, moreover, one spine on each side between the middle and the base ; 

 onthetibiieof the second pair, the third pair of spines is placed still more 

 upward, so that these tibise have 2. 2. 2. spines beneath and 1. 1. spines 

 on each side. Abdomen is of the ordinary form; the vulva is not very 

 conspicuous. It consists of an oblong (not depressed) pale area, which 

 is narrow in front, strongly dilated on both sides, behind; the anterior 

 narrow portion, which is much longer than broad, and rounded at the 

 apex, with nearly parallel sides, shows two longitudinal fine furrows; 

 the posterior portion is about double as broad as the anterior, some- 



