.510 TranmcHona South African Philosophical Society, [vol. xii. 



F-t. Apical part of i>ostei'ioi' tarsi ciliate and with- 

 out an apical spine. 



Mentuni elongato-ovate with the ligular part 

 dilated ; maxillse four- or five-dentate, in the 

 latter case the basal tooth is bifid Pentodontoschema . 



Mentum lanceolate at tip, maxillse six-dentate Hi/boschcDia. 



Mentuni elongate, acuminate at tip ; maxillas 



small, not dentate Orsiloclms. 



F^. Apical part of posterior tibiae neither ciliate 

 nor spinose. 



Frontal carina raised in a vertical wall in 

 both sexes ; posterior tibiffi very broadly 

 dilated Tcmnorhynchits. 



Frontal carina normal ; clypeus acuminate . . Callistemonus. 



T>\ Maj*^ rounded, very convex ; apical part of 

 anterior tibiaa ciliate. 



F-. Clypeus very narrow, lanceolate ; club of 

 antennse uniform, moderately long; mentum 

 very sharply acuminate at tip Pychnosdmna. 



F'. Apical part of anterior tibiae slightly ciliate 

 and triangular. 



Clypeus not very narrow ; club of antennse 

 very long, laminiform ; mentum convex at 

 base, deeply excavate at tip and emarginate 

 there Homceoinorphus. 



B\ Intermediate and posterior tibiae digitate at apex. 



b-. Claw of anterior tibiaj thickened in the 

 male. 



]\Ientum elongato-ovate, and with the ligular 

 part strongly constricted laterally and ex- 

 panding triangularly at tip ; maxillse five- 

 dentate . . . . : Cyplionistes. 



h\ Inner claw of anterior tarsi of male not 

 thickened. 



Mentvim small, oblong at tip ; maxilla con- 

 cave, transverse, not dentate Oryctes. 



Mentum elongato-ovate with the apical part 

 emarginate ; maxillse strongly arcuate at tip 

 and briefly bifid at apex and at base . . . . ArcJion. 



A'. Labial palpi inserted in the inner part of the mentum. 

 B=. Intermediate and posterior tibise non-digitate at 

 apex. 



