372 Annals of the South African Museum. 



notum very convex in front, hiding the pronotum almost entirely from 

 above. The scutellum is very convex lengthwise, and is separated 

 from the mesonotum by a deep and clathrate groove. Dorsum of 

 epinotum very oblique, twice as wide as long, sharply marginate at the 

 sides, a little longer than the vertical declivity. Both segments of the 

 petiole somewhat flattened dorso-ventrally, wider than deep. The 1st 

 segment, seen from above, more or less trapezoidal, almost as long as 

 wide in front, convex and widest in front, the anterior lateral angles 

 acute and produced. Second segment like the 1st but shorter, the 

 anterior margin less convex transversely. First abdominal segment 

 widened towards its apex. Wings as in the $ but shorter. Legs 

 fairly long and slender. 



S. Rhodesia, fairly common on the granite and schist formations. 

 Types of $ and <J in my collection. (S.A.M., E.M., Gr.A. colls.) 



Var. spbingvalensis, n.v. 



5 • 3*1 mm. Head and abdomen very dark brown, the base of the 

 latter a little paler. Thorax and nodes yellowish-red. Legs and 

 antennae brownish-yellow, the scape and club brown. This variety 

 differs from the description of the type of the species only in the 

 almost smooth and very shining abdomen. From the race nitidi- 

 ventris it may be distinguished by the smaller size, paler thorax, and 

 the much thinner epinotal spines. 



Springvale, S. Rhodesia. (S.A.M., R.M., Gr.A. colls.) ; type in my 

 collection. 



Tribe DACETINI, Forel. 



Including the following genera : Strumigenys, Smith ; Microdaceton, 

 Santschi ; and JEpitritus, Emery. All the species are easily recognised 

 by the shape of the head, which is strongly cordate and often deeply 

 emarginate behind. 



Genus STRUMIGENYS, Smith. 

 Journ. Ent., I, p. 72, 1860. 



Characters. 



£ . Antennae 6-jointed, club 2- jointed and usually much longer 

 than the rest of the flagellum. Head coi'date, narrowed considerably 

 in front, and higher behind than in front, the posterior margin often 



