658 Annals of the South African Museum. 



from in front or from behind, the dorsal face thick, deeply and 

 widely emarginate in the middle. Wings tinged with pale yellow, 

 nervures and stigma ochreous. 



Bulawayo, Bembesi and Redbank, S. Rhodesia. Not common, 

 forming small nests in the ground. 



(S.A.M., R.M., G.A. colls.). 



C. niveosetosus, Mayr. 



Verh. Zool. Bot. Ges. Wien, vol. 12, p. 665, §. 1862. 

 Reise der Novara, Formicid. p. 35, $. 1865. 



Qj., 8 mm. Black, antennae and tarsi ferruginous, mandibles dark 

 castaneous red. Head and thorax dull, the cheeks and mandibles 

 slightly shining, abdomen slightly shining and transversely rugulose. 

 The sculpture of the head and thorax consits of an exeedingly fine 

 and close puncturation, somewhat reticulate as well on the thorax, 

 (the sculpture much denser than in any of the preceding species). 

 The pubescence is very fine and short, decumbent and pale yellowish 

 white, on the legs somewhat longer and fairly abundant, elsewhere 

 very sparse. The erect pilosity is very distinctive of this species, 

 consisting of thick, blunt and almost snow-white hairs. These are 

 scarce on the head; there is a row of such hairs, short and oblique, 

 on the anterior margin of the clypeus and on the masticatory 

 margins of the mandibles. There is a transverse row on the poster- 

 ior half of the pronotum, three or four hairs on the mesonotum, 

 and a row on each side of the declivity and dorsum of the epinotum. 

 The edge of the scale is similarly fringed with them, and there are 

 about three transverse rows on each abdominal segment. They are 

 absent from the legs and antennae. Head, including closed man- 

 dibles, more or less triangular. It is widest behind and about as 

 long as wide, the posterior margin almost straight. The scapes 

 extend beyond the hind margin of the head by little more than 

 their apical width. Median area of clypeus subquadrate, convex 

 transversely, a little longer than wide, its anterior margin feebly 

 convex, the projecting lobe very short. Frontal area small. Eyes 

 flat, placed at the posterior third of the sides. Mandibles with 6 

 or 7 teeth, slightly shining, coarsely and sparsely punctured. Head 

 not more than half as wide again as the pronotum. The latter is 

 twice as wide as long, not very convex transversely, with distinct 

 but obtusely angled shoulders. Dorsum of the epinotum wide, slightly 

 arcuate lengthwise, a little longer than the subvertical declivity, which 

 it joins in a wide angle. The declivity, seen from the side, is feebly 



