76 THE CANADIAN ENTOMOLOGIST. 



ee. Elytral spots linear, subconfluent. 



Thorax infiiscate at base and apex (.18 in.) 



sericetts, Lee. 



Thorax not infuscate (.08 in.) . .vittatipennis, G.&H. 



eee. Elytra black, margin and two vittae on each testaceous. 



Thorax dark at base and apex (.16 \n.).vittaius, Lee. 



dd. Black or blackish above, sides of elytra often rufescent. 



f. Punctuation indistinct. 



Sides of prothorax oblique (.20 m.)..utodestus, Aube'. 

 Sides of prothorax rounded (.21 m.)...iiotabilis, Lee. 



ff. Punctuation distinct (.16 in.) niger, Say. 



bb. Pubescent or glabrous; thorax unequally punctured, disk often 

 nearly smooth, 

 g. Thorax hardly margined at the sides. 



h. Sides of thorax not forming an angle with the elytra. 

 More elongate, sub-parallel (.16 'm.).americanus, Aube. 

 Broader, pointed behind, more obtuse in front (. t6 



in.) dichro7is, Melsh. 



More ovate, humeral angles pale {.\ ^\n.).signatus,^la.nn. 



hh. Sides of thorax forming an obtuse angle with the elytra. 



Black, sparsely pubescent (.14 in.). . .caliginostts, Lee. 



Pubescence wanting (.12 in.) . .  tristis, Payk. 



gg. Thorax conspicuously margined at sides. 



Pubescent, black, feet rufo-piceous (.17 'm.).tenebrosus, Lee. 

 Glabrous, rather broad, thorax very faintly punctulate, 



elytra faintly punctate (.14 in.) stagnalis, G. & H. 



Glabrous, still broader and shorter, thorax nearly smooth, 

 elytra more sparingly and strongly punctate (.14 



in.) oblitus, Aube. 



bbb. Glabrous, thorax equally punctate; ferruginous, elytra black 

 with testaceous fascife, thorax broadly infuscate at apex, body 



beneath piceous black (.14 in.) coiichinus, Lee. 



A^ Elongate, obconic, glabrous, elytra piceo-testaceous, coarsely punc- 

 tate, clypeus rounded not emarginaie, male antennae dila.ed at 

 middle. 



Punctuation mixed, fine and coarser (.20 \n.) . .oblongus, Steph. 



Punctuation uniform (.25 in.) difformis, Lee. 



A'. Sub-ovate, convex, finely pubescent, clypeus broadly emarginate at 

 middle ; yellowish testaceous, finely punctured, elytra piceous 

 with lateral spots (.09 in.) mellitus, Lee. 



