966 



FAMILY L. SCARABiEIDzE. 



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

 tively very coarse. diffinis. 

 ee. Form larger, more robust; punctuation not conspicuously 

 coarse. 



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

 with a slight hook at tip. 1817. vehemens. 



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

 straight. 



g. Ventral ridge of fifth segment of male more or less curved. 

 h. 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. 

 Till. Ventral ridge overhanging its full length behind, shorter 

 and more decidedly curved; last ventral segment of 

 female emarginate. 

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

 the fifth segment and somewhat overhanging the last 

 segment. 1819. aecuata. 

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

 margin of the fifth segment, 1820. dubia. 

 gg. Ventral ridge straight, not overhanging behind. 



1821. GRAXDIS. 



aa. Clypeus densely punctured, its margin narrowly reflexed, 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. 



kk. 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. 

 II. Antennal club of male very little longer than the funicle ; last 

 ventral with a deep impression. 

 m. Thorax rather evenly punctured, its margin not distinctly ere- 

 mite ; fifth ventral segment of male impressed at middle and 

 slightly granulate, with a feebly oblique ridge each side. 



1823. FRATERNA. 



mm. Thorax sparsely and very irregularly punctured, with large 

 smooth spaces near the center, its margin distinct^ 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 confluently punctured and with an elevated 

 smooth median line ; elytra! costae feeble but distinct. 



KNOCHII. 



