152 KORTII AMERICAN 



Prothorax widest at the anterior margin ; apical angles prominent; 



10. agnatUs. 



Prothorax widest slightly before the middle, where the sides are 



evenly and strongly arcuate 11. Sayi. 



Legs not black throughout, sometimes nearly uniform in color ; gener- 

 ally, however, having strongly contrasting bands of paler tint. 



Legs uniformly piceous-brown throughout 12. amabilis. 



Legs almost uniformly pale piceo-testaceous throughout ; head much 



larger, slightly broader than the elytra 13. flavicomis. 



Legs black with paler hand or bands. 



Legs black, with exception of a narrow, strongly marked band of 

 reddish-testaceous near the bases of the femora. 



14. annularis. 

 Legs black ; bases of the tibiae distinctly and rather abruptly 

 paler. 

 Elytral punctuation very sparse, coarse, deep, and irregularly 



distributed. Arizona 15. perforatum. 



Elytral punctuation finer, sparse, evenly distributed. Florida. 



16. nitescens. 

 Legs black, generally clothed densely with plumbeous or cinereous 

 pubescence ; tarsi alone paler. 

 Elytral punctuation very coarse, deep, and somewhat sparse. 



Pronotum strongly, obliquely, and conspicuously swollen near 

 each basal angle ; pubescence long, coarse, and prominent. 

 Anterior and posterior margins of the prothorax equal in length ; 

 sides somewhat angulate near the middle. Washington Ter- 

 ritory 17. pollens. 



Anterior margin longer than the posterior ; sides evenly rounded 



near the middle. Colorado 18. patens. 



Pronotum very feebly swollen near the basal angles. 

 Prothorax equally wide at the base and apex. 



Pubescence short, coarse, and rather prominent ; sides of 



prothorax arcuate 19. recontiitus. 



Pubescence short, tine, and inconspicuous ; sides of pronotum 

 feebly angulate ; body more depressed and slender. 



20. propinquus. 

 Prothorax distinctly wider at the apex than at the base. 



21. canadensis. 

 Elytral punctuation very fine, closely crowded, and very evenly 

 distributed. 

 Very robust species ; head narrower than the elytra ; prothorax 

 short, robust, sides arcuate. 

 Pubescence fine, short, and very inconspicuous. British Colum- 

 bia, Colorado 22. pinguis. 



Pubescence long, rather conspicuous ; punctuation much more 

 sparse ; interspaces more highly polished. Colorado. 



23. utenis. 



Species more slender ; sides nearly parallel ; head as wide as the 



elytra ; tarsi much paler ; sides of prothorax rather angulate. 



