178 NORTH AMERICAN 



The specimens associated above differ among themselves to a slight 

 decree in several particulars. In the Californian specimens the punc- 

 tures are not so closely crowded as in the typical male, which is from 

 British Columbia. The Southern specimens also appear to have paler 

 and much more pubescent tarsi. There is one male from Colorado, 

 in which the sexual modification is slightly different, the incisure of 

 the sixth segment being relatively deeper, and having the sides of the 

 notch distinctly arcuate; in this specimen, also, the seventh segment 

 is more strongly and narrowly rounded behind. These specimens 

 resemble each other so closely, that the most careful scrutiny with a 

 hand lens fails to show any difference which may not be accidental, 

 and I have, therefore, concluded to unite them all. 



The tarsal claw of this species is shown on the plate, fig. 14. 



23. A. lltenis n. sp. — Form robust. Pubescence short, rather sparse 

 and coarse, semi-erect, evenly distributed, very dark cinereous in color, not 

 very conspicuous. Head moderate, slightly more than twice as wide as long ; 

 labrum very prominent ; interocular surface nearly three times as wide as 

 the eye, very feebly convex; sulcations narrow, very feeble; intermediate 

 surface twice as wide as the lateral portions, broadly and feebly convex ; 

 punctures rather small, round, deep, nearly evenly distributed, distant by 

 less than one-half their own widths; ocular lines convergent, meeting at 

 about one length in advance; antennae as long as the width of head, funicle 

 rather slender, club elongated, not prominent, compact, basal joint black, 

 remainder translucent, dark testaceous, club distinctly darker ; third joint 

 one-third longer than the fourth, seventh much longer than the eighth, 

 nearly equal in thickness, joints of club increasing slowly in length, tenth 

 almost exactly cylindrical throughout its length ; maxillary palpi long, third 

 joint rather slender, nearly as long as the first two together, first two joints 

 and the base of the third translucent, rlavo-testaceous, third infuscate toward 

 tip. Sides of prothorax for two-thirds the length posteriorly nearly parallel, 

 rather strongly and evenly arcuate, thence rather strongly convergent to the 

 base and just visibly sinuate; anterior margin slightly longer than the 

 posterior, both nearly straight; disk of pronotnm very slightly narrower 

 than long, very feebly swollen near each basal angle ; punctures deep, rather 

 coarse, very close, round, and nearly evenly distributed, varying slightly in 

 size, generally distant by one-half their widths. Elytra at base very slightly 

 wider than the head ; sides nearly parallel, slightly longer than the width at 

 base, feebly and somewhat unevenly arcuate throughout; together broadly, 

 roundly, and moderately emarginate behind ; suture two-fifths longer than 

 the pronotum ; surface broadly and extremely feebly impressed along the 

 suture, elsewhere very feebly and indefinitely undulated, nearly even ; 

 punctures coarser toward the apices, somewhat unevenly distributed, deeply 

 impressed, generally separated by nearly their own widths ; interspaces very 

 feebly convex, polished, scarcely visibly reticulated. Abdominal segments 

 decreasing uniformly and rather rapidly in width, first as wide as the con- 



