562 Annals of the South African Museum. 



as long as it is wide at its base ; declivity oblique, about as long as 

 the dorsum, produced at each angle below into a blunt tubercle, 

 directed outwards, clearly visible when looked at obliquely from the 

 side. Petiole like that of A. longinoda, but the node is narrower, less 

 convex vertically in profile, and armed with longer and thinner spines, 

 which are as long or nearly as long as the node is deep. 



Sawmills. Umgusa River, S.R. 



A very distinct species, most nearly allied to A. longinoda, but with 

 a very different sculpture and colour. The nest was situated in loose 

 yellowish sand, the colour of which so closely matched that of these 

 insects as to render them almost invisible. A very agile and swift 

 species. 



(S.A.M., R.M., G.A. colls. ; type in my collection.) 



A. rubrovaeia, Forel. 

 (As var. of simplex) Ann. Soc. Ent. Belg., vol. 54, p. 449, £ , £ , 1910. 



This species differs from its race pilosa in being a little larger, in 

 having a wider head, and in the absence of exserted pilosity on the 

 scapes and tibiae. 



In the <$ , which is 2 mm. long, the scape does not extend beyond 

 the posterior margin of the head by more than one-third of its length. 

 Basutoland (Wroughton). I have not seen the type-species, and the 

 above characters are extracted from Forel's description of the race 

 pilosa. 



Race pilosa, Forel. 



Ann. Soc. Ent, Belg., vol. 57, p. 141, £ , 1913. 



^ . 1'7-1'9 mm. Head dark brown, thorax varying from yellowish- 

 red to brownish brick-red, abdomen and petiole black. Scapes and 

 first two joints of the flagellum dirty ochreous, the rest of the flagellum 

 brown ; legs brown, the articulations and the tarsi ochreous. Without 

 sculpture, entirely smooth and shining. A whitish, short and fairly 

 sparse pilosity on the body, scapes and legs. Head subquadrate, as 

 long as wide, hardly narrowed in f ront, the sides moderately convex, the 

 posterior margin shallowly emarginate in the middle. Eyes placed a 

 little in front of the middle of the side. Scapes short, only just 

 extending beyond the back of the head ; 2nd and 3rd joints of the 

 flagellum wider than long, 4th and 5th as wide as long, the remaining 

 joints very little longer than wide. Mandibles tri dentate, sparsely 

 punctured and shining. Clypeus very convex in the middle, but not 



