1907.] Catalogue of the Goleoptera of South Africa. 493 



C 2 . Presternum with a vertical ante-coxal and a post- 

 spine. 



Clypeus vertical ; basal part of rnentum produced 



coxal into a long, more or less vertical process . . Gcnuchus. 



D 1 . Tarsi short, 3-jointed ; legs inermous. 



Legs quite glabrous, tarsal joints fused ; inter- 

 mediate and posterior tibiae without spine on 

 the upper side Trictioplus. 



C 1 . Presternum with a rudimentary vertical ante-coxal 

 process. 



a'. Intermediate and posterior tibia' not dentate on 

 the upper side. 



ft 2 . Anterior tibiae uni-dentate. 



Anterior part of clypeus reflexed in a conspicuous 

 lamina ; pygidium vertical, highly carinate in 

 the centre ; sternal process swollen at tip. . . . Nyassiniiis. 



Anterior part of clypeus bifid ; pygidium with 

 a high round keel produced at apex in a thick 

 process rounded at the top Myrmecoehilus, 



a'. Intermediate and posterior tibiae dentate on the 

 upper side. 



b\ Anterior tibiae pluri-dentate. 



Last joint of labial palpi large ; prothorax sub- 

 orbicular ; anterior tibise bi-dentate Trogodes. 



A'. Intermediate coxae separated by a rudimentary mesosternal 

 process, or without process. 



B 1 . Mentum obturating completely the buccal part, labial 

 palps not reaching the anterior margin. 



a. Intermediate and posterior tibise dentate on the 

 upper side. 



Basal part of clypeus convex ; prothorax not incised 

 laterally near the base ; anterior tibiae broadly dilated 

 at apex and strongly bi-dentate Anatonochilus. 



Mesosternum vertical, process between coxae oblite- 

 rated ; prothorax sharply incised at the base ; 

 anterior tibiae tri-dentate ; body thick Scaptobitis. 



Meta- and meso-sternum fused, the latter plane in 

 front of coxae ; prothorax incised at the base ; 

 anterior tibiae tri-dentate ; body very strongly com- 

 pressed Placodidus. 



