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



and sharp in the 3 , blunt and with the outer one compressed and 

 rounded at tip in the $? ', presternum with a vertical spine-like 

 process before the coxa' ; tarsal claws moderately long. 



I have restricted to this genus all the species in which the outer 

 face of the mentum is not greatly swollen, and is broadly and deeply 

 excavated. 



The species of this genus are termitophilous in South Africa, and 

 some have a very wide range. The sexual differences are often great 

 in either sex. The genus is represented in Africa, also in India, 

 Assam, and Hongkong, where their habits are probably the same. 



Key to the Species. 



A 2 . Legs not simple in both sexes. 



B-. Prothorax plainly grooved longitudinally. 



Terminal part of hind tibiae produced inwardly in a 



hamate process as long as the hind spur ( <? ) .. .. calcaratus. 



Terminal part of intermediate and hind tibia? with an 



inner arcuate process ( <? ) anniger. 



Terminal part of hind tibia? produced into a short rect- 

 angular process supporting the hind spurs (?) vagus. 



B\ Prothorax not plainly grooved longitudinally. Anterior 

 femora deeply notched at apex, inner basal part of 

 anterior tibia? emarginate ( s ) agynsibanus. 



A 1 . Legs simple in both sexes. 



B-. Vertex of head with a transverse keel. 



C 2 . Prothorax not grooved longitudinally. 



Body glabrous on the upper side ; prothorax with the 

 outer angles not completely rounded ; punctures of 

 the prothorax round, with smooth intervals, those of 

 the elytra plainly cicatricose Jtropi/nquus. 



Body briefly but somewhat densely pubescent on the 

 upper side; prothorax nearly orbicular; punctures 

 scabrose, shagreened ; elytra punctulate, hardly cos- 

 tulate termiticohi. 



Body glabrous; prothorax with the hind part broadly 

 rounded, laterally, the punctures rounded, with nearly 

 smooth intervals; elytra deeply punctate, each 

 plainly quadri-costate tin batus. 



C Prothorax grooved longitudinally. 



Body briefly yet plainly pubescent OH the upper side; 

 prothorax broadly rounded laterally behind, very 

 plainly shagreened; elytra with four costs on each 

 side, intervals not striolate ; pygidium of ? with a 

 very broad depression sulcatum. 



