492 Transactions South African Philosophical Society, [vol. xiii. 



a 1 . Antennee 9-jointed. 



Prothorax hexagonal Macromima. 



Prothorax not hexagonal Cymophorus. 



A3. Mesosternum with a blunt process between the inter- 

 mediate coxse. 



a. Frontal part depressed, carinate longitudinally, clypeus 

 reflexed. 



Anterior margin of clypeus highly raised in the centre ; 

 anterior and posterior tibiae strongly bi-spinose on upper 

 side ; last abdominal spiracle acute Spilophorus. 



Anterior margin slightly raised in the centre ; anterior 

 and posterior tibiae uni-spinose on upper side ; last ab- 

 dominal spiracle plane Hoplostomus. 



A 2 . Intermediate coxse separated by a narrow mesosternal 

 process. 



B 2 . Mentum not obturating completely the buccal cavity, 

 leaving the labial palps exposed to view. 



D 3 . Tarsal joints moderately slender, elongated ; 

 5-jointed 



a 2 . Last spiracle of abdomen not prominent. 

 6 2 . Clypeus very convex at the base. 



c 2 . Posterior part of prothorax rounded 

 laterally. 



Mentum not gibbose in the outer face . . Ccenochilus. 



Mentum gibbose in the outer face . . . . Anatochilus. 



a 1 . Last spiracle of abdomen spinose or tuber- 

 culate. 



c 1 . Posterior part of the prothorax straight or 



only slightly sinuate Plagiochilus. 



D z . Tarsal joints compressed, transverse, or nodose. 



Prothorax quadrate ; elytra striate, covered 



with oblong scales . . . . Proxewus. 



Prothorax hexagonal, humeral part of elytra 



very sloping Astoxenus. 



b x . Clypeus not convex. 



Clypeus not deflexed, head simple ; pro- 

 thorax hexagonal ; each elytron with a con- 

 spicuous costa ; anterior tarsal joints not 

 nodose Pilinurgus. 



Clypeus deflexed, head highly carinate ; 

 prothorax sub -"hexagonal ; elytra bi-costate, 

 anterior tarsal joints strongly nodose. . . . Lissogenius. 



