AMERICAN COLEOPTERA. 17 



21. Sides of prothorax strongly subangularly rounded at middle, 



distinctly sinuate posteriorly, and slightly so anteriorly; 

 lower edge of front and hind femora, the front and hind 

 tibia? within, and the median line within densely hairy 



(male) 49. illustris. 



Sides of prothorax less strongly rounded at middle, not sinuate 

 either before or behind, vestiture of legs and abdomen 

 normal. 

 Clypeal margin broadly reflexed. 



Clypeus more deeply sinuate, the suture distinctly impressed, 

 pygidium without impressed line, elytra usually but 

 slightly wider than the thorax 50. beyeri. 



Clypeus less deeply sinuate, the suture obliterated at middle; 



pygidium with median impressed line; form usually 



stouter, less parallel, the elytra behind the middle more 



obviously wider than the prothorax ...51. Slllcatula. 



Clypeal margin very narrowly reflexed. 



Labrum deeply emarginate, punctuation of thorax moderate. 



52. moerens. 



Labrum broadly emarginate, punctuation of thorax unusually 

 coarse 53. punctipennis. 



22. vSides of prothorax strongly arcuate, much wider at or slightly 



behind the middle than at base 23. 



Sides of prothorax moderately arcuate, very slightly or not at all 

 narrowed behind the middle 26. 



23. Tarsi not hairy beneath 24. 



Tarsi distinctly hairy beneath in the male, less evidently so in the 



female 25. 



24. Claws similarly toothed on all the feet. 



Clypeal margin very faintly or scarcely sinuate at middle; front 

 angles of prothorax not at all prominent, upper tooth 

 of front tibia? slightly post-median. 

 Prothorax lightly but quite evidently longitudinally sulcate at 

 middle; elytral punctuation confused only on the sub- 

 sutural interspace; size larger (12 mm.), color black. 



54. corvina. 

 Prothorax without median sulcus, size much smaller (6-7.5 

 mm.). 

 Prothorax finely not closely punctate; elytra not closely 

 punctate, the punctures forming nearly regular lines 

 except in the subsutural interspace. 

 Black or brownish black, prothorax larger, usually more 

 than one-third the length of the elytra. 



55. carbonata. 



Rufotestaceous (castaneous in a form doubtfully referred) , 



prothorax smaller, less than one-third the length of 



the elytra 56. rufiola. 



TRANS. AM. ENT. SOC. XXXV. (3) JANUARY, 1909. 



