A Monograph of the Formicidae of South Africa. 11 



(5). 6. Usually no ocellus in the $ ; pygidium without spines at the sides. 

 (10). 7. Insertion of the antennae not covered by the frontal carinae. 

 (9). 8. Abdomen strongly reflexed ventrally, or, if not, the frontal carinae are 



fused together and to the clypeus Proceratiini, Emery. 



(8). 9. Abdomen not reflexed ventrally ; frontal carinae distinct from each 

 other. Antennal sockets delimited laterally by carina. 



Cerapachyini, Forel. 

 (7). 10. Insertion of the antennae at least partly covered by the frontal carinae.* 

 (12). 11. Frontal carinae with a lateral lobe ; antennae inserted close together. 



Ponerini, Forel. 



(11). 12. Frontal carinae with a lateral lobe, but antennae inserted widely apart ; 



clypeus flat, and whole body covered with a very fine pruinose pubescence. 



Platythyreini, Emery. 



Section PBODOBYLLNAE, Emery. 



Tribe CEBAPACHYINI, Forel. 



Characters. 



Frontal carinae nearly vertical in all the sexes, and not covering 

 the insertion of the antennae. £ without ocelli ; petiole narrowly 

 articulated to the 1st abdominal segment. 



Wings with only one closed cubital cell. 



Including two South African genera, distinguished as follows :— 



1. Last antennal joint much larger than the preceding, forming a single-jointed 

 club; petiole not margined .. .. .. .. .. .. Cerapachys,~E. Smith. 



2. Last antennal joint only slightly larger than the preceding, not forming a club ; 

 petiole with lateral margins sharply defined Plnjracaces, Emery. 



Genus CERAPACHYS. 



Smith, Journ. Proc. Linn. Soc. Zool., ii., p. 74, 1857. 



Characters. 



£ . Head emarginate posteriorly and the posterior angles promi- 

 nent. Clypeus very short and fused with frontal carinae, which are 

 short and close together ; the latter do not cover the insertion of the 

 antennae. The antennal socket (or more accurately, the space on 

 the front of the head surrounding the socket) is limited laterally by a 

 carina. Antennae with 9 to 12 joints, the terminal joint large and 

 forming a club, and at least as long as the three preceding joints 

 together. 



* Except in Opthalmopone, in which the insertion is almost bare. 



