12 Annals of the South African Museum. 



Thorax without, or with indistinct sutures. Lateral margins of 

 the petiole not sharply denned. The 1st abdominal segment sharply 

 constricted off from the 2nd. The latter as long as the succeeding 

 segments taken together. 



2 . Winged and resembling the worker, or apterous and ergatoid. 



$ . Antennae of 13 joints; anterior wings with only one complete 

 (closed) cubital cell. 



Key to the $ % of Cerapachys. 



(4). 1. Eyes absent, small reddish yellow species. 



(3). 2. First abdominal segment wider than long, nearly as wide behind as the 2nd 

 segment Wroughtoni, Forel, v. rhodesiana. 



(2). 3. 1st abdominal segment as long as wide, distinctly narrower than the 2nd 

 segment Wroughtoni, Forel. 



(1). 4. Eyes present, black or brownish species. 



(6). 5. Puncturation of head, thorax, petiole, and 1st abdominal segment dense 

 and very large ; posterior dorsal margin of the petiole bisinuate. 



Cooperi, Arnold. 



(5). 6. Puncturation small and not very dense ; posterior dorsal margin of petiole 

 straight. 



(8). 7. Body black and very shining, sparsely punctured, pubescence and pilosity 

 scanty cribrinodis, Emery, v. natalensis, Forel. 



(7). 8. Body castaneous brown, not very shining, more closely punctured, pubes- 

 cence and pilosity rather abundant Peringiteyi, Emery. 



C. cribrinodis, Emery. 

 Ann. Soc. Ent. Belg., vol. 13, p. 163, $ , 1899. 



" £. 3 - 7 to 4 mm. Blackish brown, shining; the front of the 

 head, mandibles, antennae, tarsi, and apex of abdomen rusty red, 

 last joint of antennae and tarsi ferruginous. 



Head a little longer than wide, the sides rounded, as wide in front as 

 behind and widely emarginate posteriorly; the posterior angles sub- 

 acute. The eyes large and flat, inserted in about the middle of the sides 

 of the head : the frontal carinae fused with the clypeus, forming on 

 each side a projecting lobe, itself bilobed anteriorly. The antennae 

 are therefore placed farther forwards than in other species of the 

 genus ; the frontal carinae are parallel in front, high and close 

 together, but separated by a groove ; posteriorly they are fused 

 together and abruptly terminated by a depression continuous with 

 the antennal sockets. The genal carinae are raised anteriorly into 

 a prominence, below which is a depression sufficiently large to 

 accommodate the scape when the latter is directed forwards. 



Mandibles narrow, their apical margin very oblique, with four 



