526 BULLETIN UNITED STATES GEOLOGICAL SUEVEY. 



rows of about 6 teeth in each ; only the femoral and patellar joints of 

 the palpi provided with some teeth ; joints of legs all rounded, the 

 thighs and patellae beset with small spinules — S 5 ad. Length about 

 5^(^HJ(2) millim. 



Female. — The hody (truncus) is inversely ovate, densely and rather 

 coarsely granulate above, smooth below ; seen in profile, it is strongly 

 arcuatoconvex from behind the eye-eminence to the anus, the first 

 cephalothoracic segment being nearly horizontal ; the furrow which sep- 

 arates the second and third cephalothoracic segments is rather faint, 

 that between the first and second segments very deep and strong and 

 curved backward, as is also the furrow or articulation between the third 

 cephalothoracic and the first abdominal segments ; moreover, the first 

 cephalothoracic segment shows a shorter straight furrow a little behind 

 the eye-eminence, and its hind margin is somewhat elevated. The 

 furrows between the Ist-Oth abdominal segments are very faint; the 

 following three segments are limited by strongly marked furrows or 

 articulations. The first cephalo thoracic segment is nearly half-moon- 

 shaped, truncated in the middle in front, sinuated in the sides above the 

 coxse, convex transversely; in front, at the very margin, it is elevated 

 into two large very obtuse or truncated tubercles separated by a longi- 

 tudinal furrow, and each surrounded above by a ring or crown of small 

 conical teeth ; under the frontal margin are two strong prominent coni- 

 cal teeth rather close together, and furnished each with a few very 

 minute spinules. Along the lateral margins of the first segment is a 

 row of depressions situated one above each coxa and above the mandi- 

 bles ; above the coxse of the first pair, there is also a small but quite 

 distinct foramen supracoxale. The transverse furrow behind the eye- 

 eminence ends in a larger depression on each side. The eye-eminence is 

 of moderate size, longer than broad ; seen from the side, it is about half 

 again as long as high, nearly perpendicular in front and behind, and 

 rounded above ; above each eye, it has a row of about six conical teeth. 

 The following dorsal segments are all destitute of teeth or spines. The 

 mandibles are slender, destitute of teeth and granules above, only 

 strewed with short hairs. The palpi are of moderate length ; their 

 femoral joint is slightly incrassated at the apex (when seen from above), 

 the patellar joint gradually somewhat incrassated toward the apex, 

 about half again as long as broad, the tibial joint cylindrical, 2J times 

 as long as broad ; these joints are beset with short hairs or bristles, and 

 the patellar joint is moreover, as is also the femoral joint at the apex, 

 furnished with several small conical teeth. The tarsal joint is cylindri- 

 cal, scarcely perceptibly curved downward, the claw smooth. The legs 

 are rather short, slender, all the joints rounded, not prismatical; the coxse 

 have a small erect spine at the base, above, and one or two small teeth 

 at the apex on the fore or hind side ; the trochanters are strewed with 

 some small teeth on the sides; the thighs are beset with very small 

 spines, as are also (though less distinctly) the patellae, which moreover 



