16 H. C. FALL. 



17. Metasternum normally long, elytra not connate, body winged ...18. 

 Metasternum short, its length between the coxae not or but little 



longer than the length of the second ventral segment; 



elytra apparently connate, wings probably undeveloped. 

 Robust, much less than twice as long as wide, claws rather small, 



the tooth subapical 43. COilliata. 



Elongate, rather more than twice as long as wide, the claws 



slender and unusually long, the tooth sub-median. 



44. macronycha. 



18. Ungual tooth post-median in position, usually strongly so 19. 



Ungual tooth short, nearly perpendicular to the claw and almost 



exactly median in position. 

 Clypeus rotundate, body stouter, oblong ovate. 



Prothorax more finely not very densely punctate, disk with 

 two confluent impressions which are sometimes wanting 

 or feebly indicated; margin of body not conspicuously 

 fimbriate; hind tarsi moderately slender 45. pacata. 



Prothorax coarsely densely punctate, disk not impressed, side 

 margins of thorax and elytra fimbriate with long hairs; 



hind tarsi stout 46. fimbriata. 



Clypeus sinuate at middle; form oblong, moderately elongate. 



Sides of thorax not perceptibly sinuate, head but slightly more 

 than half as wide as the thorax, impression of terminal 

 joint of maxillary palpi of normal size, and not extending 

 beyond the middle.... 47. brevidens. 



Sides of thorax distinctly sinuate, both before and behind; 

 head about three-fifths as wide as the prothorax; impres- 

 sion of terminal joint of maxillary palpi deep and extending 

 almost from base to apex 48. fossipalpa. 



19. Clypeal margin more or less sinuato-emarginate at middle, some- 



times very feebly or barely visibly so (corvina, carbonata, 

 rufiola, thoracica) , the angles usually broadly rounded (less 

 broadly so in pubipes) 20. 



Clypeal margin convex in outline from side to side, or with the 

 middle truncate or subtruncate for a short distance, but 

 not at all sinuate (except in occasional specimens of 

 harperi) 34. 



Clypeal margin more or less distinctly angulate each side of the 

 median sinuation or truncation (except in some examples 

 of polita) :....39. 



20. Ungual tooth post-median, but distinctly shorter than the superior 



portion of the claw : 21. 



Ungual tooth apical or subapical, the claw having the appearance 

 of being cleft at or a little behind the tip, the inner portion 

 (tooth) being nearly always broader and more or less 

 obliquely truncate 22. 



