662 Annals of the South African Museum. 



posterior angles more or less rectangular, at the most only very 

 narrowly rounded. The head is not much narrower, in front than 

 hehind, highest in the middle, the anterior third usually fairly steep. 

 The scapes in our species are short, not extending heyond the hind 

 margin of the head. The mandibles are robust, strongly convex on 

 the outer margin. The clypeus is not carinate; anteriorly it is 

 narrowed and produced into a lobe ; its median area is large but 

 the lateral triangular pieces are small and separated from the median 

 area by a deep depression. The thorax is much more compact and 

 less narrowed posteriorly than in the sub-genus Myrmoturba. The 

 scale has a trenchant dorsal edge. Abdomen immaculate. The sculp- 

 ture is more or less like that of Myrmoturba, but the anterior half 

 of the head is usually more strongly sculptured, reticulate and sharply 

 punctured, and duller than the rest of the head. The tibiae are 

 not prismatic, rarely compressed. 



§ media and minor. Clypeus arcuately produced, not lobed. Eyes 

 large and prominent. Mandibles with 5 or 6 teeth as in the Q|. 

 In general, very similar to the § ^ of the sub-genus Myrmoturba. 



Q. Head shaped like that of the Qj., and not like that of the § 

 media as in the sub-genus Myrmoturba. Scutellum flat, dorsum of 

 epinotum fairly long, with a deep depression between it and the 

 metanotum. Scale as in the Dj.. Abdomen elongate and narrow, in 

 one species sharply maculate. 



cT, see C. emarginatus Em. 



The habits of our species are almost unknown, with the exception 

 of C. crepusculi Arnold. 



Key to the Qj. % of sub- gen. Myrmophyma, For el. 



(2) 1. Black species, anterior margin of clypeus convex, not produced into a 



distinct lobe ...... Heevei, Arnold. 



(1) 2. More or less yellow species, anterior margin of clypeus produced into 

 a lobe. 



(4) 3. Anterior margin of the clypeal lobe convex, indistinctly crenulate 



crepusculi, Arnold. 



(3) 4. Anterior margin of the clypeal lobe not convex, 



(6) 5. Head elongate, at least one-fourth longer than wide; clypeal lobe angu- 



larly and deeply emarginate .... JEavilandi, Arnold. 



(5) 6. Head quadrate, barely longer than wide; clypeal lobe not angularly 



emarginate. 

 (8) 7. Clypeal lobe shallowly and arcuately emarginate, the emargination 

 bounded on each side by a blunt and slightly projecting tooth or 

 tubercle. ...... emarginatus, Emery. 



(7) 8. Clypeal lobe rapidly narrowed anteriorly, snout-like, not emarginate, but 



bearing 3 or 5 blunt teeth or tubercles. 



