484 BULLETIN UNirED STATES GEOLOGICAL SURVEY. 



convex from the posterior margin to very near the hind central eyes ; 

 height of clypeus about one-third of the length of the mandibles and as 

 great as the length of the area of the central eyes, which is nearly as 

 long as broad behind, much broader behind than in front ; lateral eyes 

 larger than centrals, contiguous ; fore laterals about double as large as 

 fore centrals, which are nearly contiguous ; interval between the hind 

 central eyes larger than their diameter and than the interval between 

 them and the hind laterals ; mandibles but slightly convex above ; pal- 

 pi and legs yellowish ; abdomen short, brownish or olivaceous-gray. — 9 

 ad. Length about 2 millim. 



Female. — Oeplialo thorax longer than broad, about as loug as patella 

 and tibia of the fourth pair together ; the pars thoracica moderately 

 rounded in the sides, narrowed and slightly sinuated at the pars cepha- 

 lica, which is rather strongly narrowing forward, with routided sides, 

 and with the forehead rounded and nearly half as broad as the pars 

 thoracica; seen in profile, the cephalothorax is rather low, slightly and 

 gradually rising and somewhat convex from the posterior margin to 

 very near the hind central eyes, then, with the area of the central eyes, 

 sloping forward, the clypeus sloping still more strongly forward or 

 downward ; the cephalic impressions are well marked, the whole sur- 

 face smooth and shining. The sternum is large, nearly as broad as long, 

 broadly truncate in front, nearly heart-shaped, slightly convex, very 

 smooth and shining. The hind row of eyes, seen from above, is straight, 

 the front row, seen from before, is slightly curved upward; the lateral 

 eyes are contiguous, oblong, and larger than the central eyes, the fore lat- 

 erals about double as large as the fore centrals, which are the smallest of 

 the eight; the central eyes occupy an area a little shorter than broad 

 behind, much broader behind than in front ; the hind central eyes are 

 separated from each other by an interval evidently greater than their 

 diameter from the hind laterals by an interval equaling half their di- 

 ameter, and from the fore centrals by an interval at least as large as 

 their diameter ; the fore centrals are very close together, nearly con- 

 tiguous, and separated from the fore laterals by a space equaling half 

 their diameter; their distance from the margin of the clypeus is as great 

 as the length of the area of the central eyes. Mandibles somewhat 

 thicker than the fore thighs, somewhat more than double as long as 

 broad, their length being nearly three times as great as the height of 

 the clypeus ; they are but slightly convex above, somewhat narrowing 

 toward the apex on the inner side; their claw-furrow is armed with 

 teeth of moderate length and the claw is rather long and slender. The 

 maxillw are longish, nearly ovate, slightly inclined toward the broad 

 labium, which is rounded at tip. ThQpaljn are of moderate strength, the 

 patellar joint scarcely half again as loug as broad, the tibial joint not 

 double as long as the patellar, the tarsal joint but very slightly narrowing 

 toward the obtuse apex ; the legs are rather slender, the tibite of the 

 fourth pair about four times as long as the patellce. Abdomen not much 



