22 



Sides of prothorax. more oblique, less, bounded. 11. furiivus, Lee. 



b. Elytra strongly sinuate toward the lip: 



Large, sides of prothorax very much rounded, basal angles longer, more pr i- 



nent, more strongly carinatcd. 12. Sallei, Loc. 



Smaller; (species very indefinite and bpinionative) : 



Anterior transverse impression well defined : hind angles longer, promi- 

 nent. 

 Broader, elytral margin stronger, subangulated at the humeri, (elytra! 

 strias sometimes effaced), latebrosus, Lee. 13. substrialus, Lee 



Narrower, elytral margin finer, not angulated, (elytral stria- sometimes 

 partly effaced), ovipennis, Lee. 14. constrictus, Say. 



Anterior transverse impression feeble, or obsolete, hind angles shorter. 

 though prominent, legs ferruginous, abdominalis, Lee., lixa, Lee. 



15. incisus, Lee. 

 Anterior transverse impression obsolete, hind angles very small, scarcely 

 carinate, outer basal stria punetiform. 1(3. vinctus, Lee. 



C. Prothorax strongly rounded on the sides and narrowed behind, basal fovea? 

 single, hind angles not carinate, obtuse, or very small, and feebly promi- 

 nent. 



a. Prosternum feebly or obsoletely suleate behind: 



* Anterior transverse impression feeble : 

 Elytra tolerably strongly sinuate toward the tip : 



Large, hind anigles small, nearly rectangular. IT. wnicolor, Say. 



Large, hind angles small obtuse. 18. rotimdalus, Lee. 



Middle sized, hind angles small obtuse; Brevonrti, Lee. 



10. spoiiams, Xewin. 

 Smaller ; elytra less sinuate toward the tip : 

 Hind angles small, prominent, rectangular, Qvulum, Chaud. 



20. acutus, Lee. 

 Hind angles obtuse and rounded, basal foveas small : 



Basal seta of prothorax in front of angle, elytra striate. 



21. obsoletus, Say. 

 Basal seta of prothorax at the angle as usual: elytra nearly smooth. 



22. lo&vipermis, Lee. 



** Anterior transverse impression a finely impressed line near the front 



margin. 23. approarimatiis, Lee. 



b. Prosternum more deeply suleate behind; hind angles of prothorax obtuse, 

 not prominent : 



* Anterior transverse impression a deep line, further from the I'ronl mar- 

 gin than in the preceding : 



Elytra smooth, or very obsoletely striate. 24. movio, Dej. 



** Anterior transverse impression not impressed: 

 Elytra with punctured stria% fainter behind, but not obliterated: tenebrosa, Dej. 



2/i. fiihir, Germ. 



