NORTH AMERICAN COLEOPTERA. 235 



Thorax as wide, or wider than long, smooth at tlie sides; anterior femora with 

 short spinous hairs beneath. 

 Raised line at base of dorsal segments scarcely sinuate; ventral segments not 



unequally punctate canescciiH. 



Raised line very sinuous at middle; last two ventral segments much more 



densel}' and finely punctured seininitens. 



Thorax longer than wide, more or less narrowed behind, sides punctured; an- 

 terior femora simple. 

 Antenna rather slender, joints ?>-10 nearly equal in length, and twice as 



long as wide opacns. 



Antennae shorter and stouter, joints 3-10 gradually decreasing in length, 

 the outer ones square, or even transverse in some. 

 Median smooth space not sharply limited, and not more convex. 



f'einoralis. 

 Median smootli space sharply defined, and very distinctly more convex. 

 Head with very large punctures both above and beneath. 



litliocliariiiiis. 

 Head always more finely and sparsely punctured beneath than above. 



Elytra pale yellow luteipeiinis. 



Elytra piceous or brown. 



Elytra densely finely punctured, opaque sericeuN. 



Elytra closely punctate, not opaque, the punctures always distinct. 



Thorax very coarsely punctured at the sides; median smooth 



space limited each side by a row of coarse punctures; thorax 



and elytra piceous, nearly black bistriatiis. 



Thorax coarsely punctured ; median smooth space not limited by 

 a row of punctures ; thorax and elytra ferruginous. 



decipiens. 



Thorax sparsely punctate at the sides, the punctures rather feebly 



impressed, thora.x and elytra dark brown siilcicollis. 



C eanesceiis Mann. — Form parallel, piceous, very faintly bronzed, side mar- 

 gin of elytra often paler, clothed with fine gray silken pubescence ; antennae stout, 

 piceous, attaining the middle of the thorax, the joints 4-10 not longer than wide, 

 gradually broader; head moderately large, quadrate, slightly wider behind the 

 eyes; surface shining, front broadly sulcate at middle, a broad fovea each side; 

 posteriorly a few large ill-defined punctures; beneath sub-opaque, with a few 

 punctures; thorax not larger in area than the head, broader than long, scarcely 

 narrower behind ; sides distinctly sinuate, disc smooth, vaguely sulcate each side 

 of middle, the sulci with a row of about ten punctures, the intermediate space 

 more convex and more elevated posteriorly, extreme side margin opaque, with a 

 few indistinct punirtures; elytra a little wider than the thorax, longer than wide 

 conjointly, densely punctate and sub-opaque, finely pubescent; abdomen sub- 

 opaque, punctuation moderately dense and finer than on the elytra, j>ubescence 

 fine, holosericeous. each segment with a vague fovea on each side, the basal ele- 

 vated line simply feebly arcuate; beneath coarsely sparsely punctate, sjiarsely 

 pubescent; legs and coxae piceous. Length ..''>6 — .40 inch: 0-10 mm. 



\ilale. — Anterior tarsi broadly dilated ; last ventral with an elongate triangular 

 incisure, the penultimate also slightly sinuate at middle. 



jFfewia/e. --Anterior tarsi moderatelv dilated: last ventral entire. 



