966 FAMILY L. SCAKAI',.^':i]).T^. 



(\ FdViii oblong. (Impressed; yuuctuatiou of thorax ami elytra rela- 

 tively very coarse. difuxis. 

 cc. Form larger, more robust; pmictuation not conspicuously 

 coarse. 

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

 with a slight hook at tip. 1S17. vehemens. 

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

 straight. 

 f/. 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 emargiiiate. ISIS, fisca. 

 ////. ^'cntral 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 tifth segment and somewhat overhanging the last 

 segment. 1819. arcuata. 

 «■/. Ends of ventral ridge at some distance from tlie hind 

 margin of the tifth segment. ISiiO. dubia. 

 .'///. Ventral ridge straiglit. not ovcrh.-inging lichiud. 



ISl'l. (IliA.NDlS. 



iKi. Clypeus densely punctured, its margin n.irruwly retlexed. rathei' deeply 

 emarginate; side margins of tlior.-ix iimrc or less serrate. 

 j. Thorax not angulalc at tlie sides, usually broader at base tl:aii mid- 

 dle. 

 A". iSubmarginal costa of elytra well mai'Ued, reaching very ne.iriy I lie 

 humeral prominence; thorax with sc.nttered coarse punctures and 

 smooth spaces of variable size. 1822. jiaiuunalis. 



A/,-. Sulimarginal costa very feeble, visible only on apical third. 



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



last ventral witluait a deep cup-shaped impression. spreta. 



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



ventral with a deep im])ression. 



m. Thoi'ax rather evenly punctured, its mai'gin not distinctly cre- 



nate; fifth ventral segment of male impressed at middle and 



sliglitly granulate, with a feebly oblique ridge each side. 



1823. FRATEHNA. 



iinii. Thorax sparselj' 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 tlie si'gment is deeply impressed. 



1824. NOVA. 

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



II. Thorax densel.\- and contluently punctured and willi ;in (■le\ated 

 smootii niedi.-iii line; clylral costa- feeble but distinct. 



KNOCIIII. 



