966 FAMILY L. SC Al; A li.lOl IUO. 



c. Form oblong, depressed ; punctuation of thorax and elytra rela- 

 tively very coarse. DIFFINIS. 

 <(. Form larger, more robust; punctuation not conspicuously 



coarse. 



/. Fixed spur of hind tibia? of male long, feebly curved, and 



with a slight hook at tip. 1817. VEHEMENS. 



//. Fixed spur of hind tibiae of male moderate in length and 



straight. 



(j. Ventral ridge of fifth segment of male more or less curved. 

 /;. Ventral ridge with the ends only overhanging behind, 

 the curve but slight, the middle of the ridge lower and 

 sloping gradually downward behind ; last ventral seg- 

 ment of female not emarginate. 1818. FUSCA. 

 ////. Ventral ridge overhanging its full length behind, shorter 

 and more decidedly curved; last ventral segment of 

 female emarginate. 



/. Ends of ventral ridge at the extreme hind margin of 



the fifth segment and somewhat overhanging the hist 



segment. 1819. ARCUATA. 



ii. Ends of ventral ridge at some distance from the hind 



margin of the fifth segment. 1820. DUBIA. 



gy. Ventral ridge straight, not overhanging behind. 



1S21. GRANDIS. 



aa. Clypeus densely punctured, its margin narrowly rettexed. rather deeply 



emarginate; side margins of thorax more or less serrate. 

 j. Thorax not angulate at the sides, usually broader at base than mid- 

 dle. 



k. Submarginal costa of elytra well marked, reaching very nearly the 

 humeral prominence ; thorax with scattered coarse punctures and 

 smooth spaces of variable size. 1822. MARGINALIS. 



/,7r. Submarginal costa very feeble, visible only on apical third. 



/. Antennal club of male nearly a third longer than the entire stem ; 



last ventral without a deep cup-shaped impression. SPRETA. 



77. Anteuual club of male very little longer than the funicle ; last 



ventral with a deep impression. 



///. Thorax rather evenly punctured, its margin not distinctly cre- 

 nate; fifth ventral segment of male impressed at middle and 

 slightly granulate, with a feebly oblique ridge each side. 



1823. FRATEKNA. 



mm. Thorax sparsely and very irregularly punctured, with large 

 smooth spaces near the center, its margin distinctly crenate; 

 fifth ventral segment of male with a distinct curved granu- 

 late ridge, behind which the segment is deeply impressed. 



1824. NOVA. 

 jj. Thorax angulate at the sides, broader at middle than base. 



n. Thorax densely and continently punctured and with an elevated 

 smooth median line; elytra! cost.-c feeble hut distinct. 



KNOCHII. 



