202 AMERICAN COLEOPTERA. 



student in the determination of our species. They follow in the 

 text in what seems to be the best order for cabinet arrangement : 



Elytra with all the strife impunctate 2. 



Elytra with the sutural stria distinctly punctulate; thorax with the posterior 

 transverse impression tripunctate at middle 10. 



2. Thorax with the posterior transverse impression not tripunctate at middle- -3. 

 Thorax with the posterior transverse impression tripunctate at middle 6. 



3. Very convex; sides of thorax strongly rounded in front, oblique behind... 4. 

 Moderately convex; sides of thorax slightly arcuate in front, feebly sinuate 



behind 5. 



4. Robust; piceons or nearly black, elytra usually more or less brownish ; thorax 



scarcely as wide at base as apex ; posterior transverse impression 

 deep; elytra with the sutural stria deep, the other dorsal strife obso- 

 lete ; legs testaceous. Length .07-. 08 inch granarius Dej. 



More elongate; piceous, sometimes slightly tinged with rufous; thorax as wide 

 at base as apex, posterior transverse impression feeble: legs testaceus. 

 Length .10 inch. fuscicornis Chaud. 



5. Thorax slightly wider at base than apex ; elytra distinctly wider than the 



thorax. 

 Moderately elongate; piceous or rufo-piceous, the elytra with an ill-defined 

 vitta or subhuuieral and subapical spots pale ; sutural stria deep, the 

 other dorsal striae obsolete ; legs testaceous. Length .07-. 09 inch. 



ineurvus Say. 



Very elongate; rufo-testaceous, elytra rarely slightly darker on the disk; 



elytra oblong-elliptical, elongate, striate as in ineurvus; legs testaceous. 



Length .09-. 11 inch dolosus Lee. 



Thorax not wider at base than apex; rufous or rufo-piceous; elytra slightly 

 wider than the thorax, striate as in ineurvus; legs testaceous. Length 

 .08-.09 inch rapax Lee. 



6. Thorax not wider at base than apex 7. 



Thorax wider at base than apex 8. 



7. Elongate; rufous or rufo-piceous; thorax about one-half wider than long, 



sides slightly rounded in front, at most feebly sinuate behind, posterior 

 transverse impression feebly tripunctate; elytra slightly wider than 

 the thorax with a deep sutural stria, the other dorsal striae obsolete : 



legs testaceous. Length .08.10 inch audax Lee. 



Robust; piceous or nearly black, elytra usually pale at apex: thorax nearly 

 twice as wide as long, sides strongly rounded in front, oblique behind, 

 posterior transverse impression distinctly tripunctate; elytra dis- 

 tinctly wider than the thorax, with a sutural and one to three abbre- 

 viated dorsal stria?.; legs testaceous. Length .07-.09 inch. 



xauthopus Dej. 



8. Form convex 9. 



Form subdepressed : dark brown or piceous. the elytra, often paler at the sides: 



thorax but slightly wider at base than apex : elytra with a sutural and 

 three or four abbreviated dorsal stria? ; legs testaceous. Length .11-. 13 

 inch tripuuetatus Say. 



9. Reddish brown or piceous, the elytra paler at sides and tip; thorax less nar- 



rowed behind than in tripunctatus. sides rounded in front, feebly sinu- 



