1900.] Catalo(ji(e of the Coleoptera of South Africa. 511 



C Median and posterior tibi;c with two oblique ciliate 

 carinse. 

 D^ Inner claw of ,inale not thiclvened. 



C-. ]\IaxilliE bifid at tip, unidentatc in the 

 middle, trifid at base. 



]\Ientum rounded laterally at base, ligular 



part not conti'acted Sijrlchtliodontus. 



^lontum in the shape of an elongate triangle, 

 very deeply incised in the middle; maxilke 

 as in Si/ricJifhodontus PsciidosijriclitJtus. 



c'. Maxillae sharply bi-dentate at tip, uni-dentate 

 at middle, and trifid at base. 



3Ientum nearly rounded at tip ; maxillae of 



Srjrichthodontiis SijrichtJioiiiorpJius 



Anterior femora dentate Vcncdus. 



D'. Inner claw of male thickened. 



^lentum nearly straight laterally, ligular part 

 narrower than the mentum, rouiided laterally and 

 broadly emarginate at tip Syrichtlius. 



B'. Intermediate and posterior tibiae digitate at tip. 



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

 verse carina spinose outwardly. 



Mentum nearly straight at tip, nearly truncate ; 



maxilljE concave, bifid at tip and bi-dentate at base Pseudocyphonlstcn. 



C'. :Median and posterior tibias having two long spines 

 instead of the transverse carinas. 



^Mentum quite trans,verse, and without trace of 



ligula RUzoplatys. 



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



Gex. HETEEONYCHUS, Burm., 

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



Mentum very elongate, either sub-carinate longitudinally at middle 

 or with two concave impressions {claiuUus), 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, 



