730 Annals of the South African Museum. 



In the 2J., the antennae are yellowish red, in the § somewhat brighter. 

 The pilosity is white, fairly scanty on the pro-mesonotum, limited 

 on the head to the frons and middle of the vertex, more abundant, 

 longer and coarser on the epinotum, scale and abdomen. The hairs 

 on the epinotnm and scale thick and bristly. In the $ minor the 

 pilosity on the abdomen is more plentiful than in the 2J. and 3 media. 



?, 10-3 mm. (hitherto undescribed). Scapes bright reddish ochreous 

 as in the $ minor, mandibles bright ferruginous, otherwise like the 21 

 in colour, sculpture, pilosity and pubescence. The posterior margin 

 of the head is straight (concave in the 21.), the sides less convex 

 than in the 21. The shoulders of the pronotum are subangular and 

 clearly visible from above. Lower half of the declivity of the epinotum 

 shining, the corners on each side with a dense and silvery pubescence. 

 Wings tinged with brownish yellow, nervures and stigma brown. 



This variety had been named for me by Dr. Forel as C.foraminosus, 

 race Grandidieri. It is a common species, forming its nest most 

 frequently in hollow stems of Acacia horrida and Sclerocarya caffra. 



(S.A.M., E.M., G.A. colls. ; type of $ in my collection). 



C. postoculatus, Forel. 



Bull. Soc. Vaud. Sc. Nat., vol. 50, p. 254, 21, & 1914. 



2|, 9 , 6-ll*6 mm. Black; flagelum dark brown, apical half of the 

 mandibles sometimes ferruginous, last four tarsal joints reddish 

 brown. Dull. Head reticulate - rugulose, distinctly and rather 

 coarsely reticulate-punctate between the eyes and frontal carinae, 

 the pit-like punctures on the cheeks much shallower and smaller than 

 in auropube?is and its varieties or in foraminosus and Olivieri, here 

 and there almost effaced. Thorax closely reticulate-punctate, the 

 declivity, scale and legs only reticulate, but the latter also with 

 a fine and sparse puncturation. Abdomen very finely and closely 

 reticulate-punctate or granulate. From the pits on the head arise 

 microscopic pubescent hairs, otherwise the head is almost without 

 any pubescence. On the thorax the pubescence is pale golden, long, 

 decumbent and fairly abundant. On the abdomen it is much longer, 

 more plentiful and of a brassy-golden colour. Pilosity whitish, 

 thick and pointed (not blunt at the ends as described by Forel). 

 Head feebly trapezoidal, very little narrowed in front, as long as 

 wide, the posterior margin straight, (feebly concave in the smaller 

 examples), the sides straight in the middle and feebly convex in front 



