366 Transactions Soutli African Philosophical Society, [vol. xiii. 



smaller and more bronzy on the upper side ; the pubescence on the 

 prothorax is also sparer and at times completely obliterated, but 

 the shape of the genital clasps is the same in both varieties. 



Sub-Tribe CETONITES. 



In this Sub-Tribe are included all the Cetoninous insects, the 

 facies of which is somewhat elongated, and usually plane or depressed 

 above, and in which the elytra when striate have the striae simply 

 punctate, or geminate without punctures and reaching from base 

 to apex; the basal joint of hind tarsi is obtuse at apex or sub- 

 nodose. 



While the first group of this section, the Ischnostomii, have very 

 distinct characters separating them from the others, the Cerator- 

 rhinii, Heterorrhinii, Uymnctii, Pachnodii, Elaphinii, Porphyronotii, 

 and Diplognathii merge into one another in such a manner that it is 

 impossible to define them except by purely arbitrary characters. 



Key to the Genera. 

 A-. Body plane in the $ , convex and massive in the ? . 



B. Basal joint of hind tarsi as long as the second or 

 shorter ; inner hind spur of the ? spatuliform. 



C. Antennal cluh of <? as long as or longer than the 



pedicel Ischnostomii. 



D. Clypeus much longer than the head in both 

 sexes. 



E-. Sternal process not projecting beyond the 

 coxse. 



F-. Base of prothorax not arcuate above 

 the scutellum. 



Frontal part not divided from the 



clypeus by a transverse ridge .. .. Ischnostoma. 



Frontal part divided from the clypeus 



by a transverse ridge Gariep. 



F'. Base of prothorax arcuate above the 

 scutellum. 



Clypeus not longer than the head and 



simple in both sexes Heteroclita. 



\ . Body plane in both sexes. 



B. Basal joint of hind tarsi shorter than the second; inner 

 hind spur of the ? not spatulatr. 



