516 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



directed downward and slightly curved forward; in tlie excavation or 

 fovea at the summit of the elevated portion it shows a very short and 

 coarse uneven tooth directed forward and outward, from the base of 

 which proceeds, along the bottom of the fovea, and almost completely 

 concealed in it, an outward-dii-ected longer and more slender spine. 

 Legs rather long and very hairy, the fourth pair four times as long as 

 cephalothorax ; the four anterior tibite have 2. 2. 2. spines beneath, 1. 1. 

 in front, and 1. 1. behind. Abdomen very hairy, of the usual form. 



Color.— Cephalotlior ax black in the bottom, with a pale brownish middle 

 band reaching to the pars cephalica, geminated by a fine black line, 

 tapering backward, and about as broad as the anterior thighs; it 

 appears to have been closely covered with grayish, more appressed hair, 

 especially along the middle, and is moreover rather densely spread with 

 long, erect, black hairs. Sternum black, gray-haired. Mandibles black, 

 with a few j^ale patches or streaks. Maxillw and labium blackish, with 

 paler edges. Palpi black, black-haired, their tibial and tarsal joints 

 deep black, the patellar joint pale brown above, with a blackish line 

 along the middle ; the femoral joint black, with some paler spots ; geni- 

 tal bulb mostly brownish, with the spines and tooth black. Legs black, 

 with pale brownish spots and rings ; the coxse are pale at the very base 

 beneath ; the thighs have one or more pale spots, especially on the sides, 

 and a pale geminated spot toward the apex above; the patellse are pale, 

 black at the base, and especially on the sides; the tibise have two (or 

 three) pale rings; the metatarsi and tarsi are pale, the former provided 

 with three black rings, the latter blackish at the apex. The legs are 

 covered with very long, more erect, mostly black hairs, as also with 

 short appressed black and pale hair. The abdomen is black above and 

 on the sides, with a rusty-brown lanceolate band along the anterior half 

 of the back; it is densely covered with black and grayish-white hair, 

 and also rather densely spread with long erect black hairs ; the abdomen 

 thus becomes black along the sides of the back, mottled with grayish- 

 white on the sides and behind the lanceolate band, and has a row of 

 grayish-white spots toward the sides. The sides of the abdomen are 

 black, the belly brownish-gray; the mamillm black. 



(J. — Length of body 9, of cephalothorax 4^ millim.; breadth of cepha- 

 lothorax nearly 3^ millim. Length of legs: I 15, II nearly 14^, III 14, 

 IV IS millim.; patella -|- tibia lY 5 millim. 



Female. — A female which I think belongs to this species has some- 

 what shorter legs, and a more evident depression on the back between 

 the pars thoracica and the pars cephalica, as also thicker mandibles, but 

 is otherwise very similar to the above described male. The cephalothorax 

 is slightly longer than patella + tibia of the first pair; its breadth equals 

 the length of tibia of the fourth pair. The vulva consists of a large fovea, 

 or depressed area, the sharp lateral edges of which are behind incras- 

 sated into two large low tubercles ; it is somewhat longer than broad, 

 narrow in front, broadly truncate behind, and has nearly the form of a 



