1900.] Catalogue of the Coleoptera of South Africa. 511 



C^ Median and posterior tibiae with two oblique ciliate 

 carinse. 

 D-. Inner claw of male not thickened, 



e~. Maxillse bifid at tip, unidentate in the 

 middle, trifid at base. 



Mentum romided laterally at base, lignlar 



part not contracted Syrichthodontas. 



Mentum in the shape of an elongate triangle, 

 very deeply incised in the middle ; maxillae 

 as in Syrichtliodontus PseudosyrichtJms. 



e\ Maxillae sharply bi-dentate at tip, uni-dentate 

 at middle, and trifid at base. 



Mentum nearly rounded at tip ; maxillae of 



Sijrichthodontiis Syrichthomorplms 



Anterior femora dentate Vcncdus. 



D^ Inner claw of male thickened. 



Mentum nearly straight laterally, ligular part 

 narrower than the mentum, rounded laterally and 

 broadly emarginate at tip SyrichfJius. 



B\ Intermediate and posterior tibiae digitate at tip. 



C-. Median and posterior tibiae with the second trans- 

 verse carina spinose outwardly. 



Mentum nearly straight at tip, nearly truncate ; 



maxillae concave, bifid at tip and bi-dentate at base Pseudocyphonistcs. 



C\ Median and posterior tibiae having two long spines 

 instead of the transverse carinae. 



jMentum quite transverse, and without trace of 



ligula Rhi.i'oplafys. 



Mentum with the ligular part bi-lobate at tip . . . . PJiizoplatodes. 



Gen. HETEEONYCHUS, Burm., 

 Handb. d. Entom., v., 1847, p. 90. 



Mentum very elongate, either sub-carinate longitudinally at middle 

 or with two concave impressions (claudius), strongly constricted 

 laterally near the tip, and expanding from there for a short distance, 

 slightly oblique laterally in the anterior margin and deeply incised in 

 the middle at the tip, it is deeply and broadly pitted, and set with 

 long, bristly hairs ; ligula fused with the mentum but very hairy, 



