50 Annals of the South African Museum. 



its widest only slightly, if at all, wider than the head across the eyes. 

 Node of petiole thick, lamellar projection beneath arcuately emar- 

 ginate, with a posterior tooth pointing backwards. 



There are two South African species, distinguished as follows : 



(2). 1. ^ . Head, excluding mandibles, only slightly longer than wide across the 

 eyes. 



c? . Frontal area very shining and indistinctly defined ; mandibles 

 narrow and obliquely truncate at the apex ; 6th ventral segment furnished 

 on each side with a flat and spatulate appendage . . hottentota, Emery. 



(1). 2. £ . Head, excluding mandibles, one and two-thirds as long as wide across 

 the eyes. 



c? . Frontal area dull and distinctly defined ; mandibles broad and acute 

 at the apex ; 6th ventral segment simple Berthoudi, Forel. 



0. Berthoudi, Forel. (Plate II., figs. 11, 13.) 



Ann. Soc. Ent. Belg., vol. 34, C.E. p. 112, $ , 1890. Mitt. Schweiz. 

 Ent. Ges., vol. 6, p. 76, $ , 1894. 



$ . 12 mm. Black, masticatory margin of mandibles, extreme base 

 of scape and 2nd-5th joints of all the tarsi dark red, calcaria reddish 

 yellow. The whole body microscopically rugulose and covered with 

 a very close and fine dull golden pubescence ; the inner margin of 

 the mandibles, the clypeus and last two segments of abdomen with a 

 few golden bristles, more abundant on the last segment. Clypeus 

 broadly angular in the middle and with three small grooves on each 

 side of the middle area behind the anterior margin, the innermost 

 the longest. Head very long, parallel-sided and rounded behind. 

 The mandibles strongly convex longitudinally ; seen from the side, 

 as long as from the apex of the cheek to the posterior margin of the 

 eyes. The latter are large and situated behind the middle of the 

 sides of the head. 



The clypeus produced posteriorly between the frontal carinae, 

 beyond which is a narrow, shining depression. The frontal carinae, 

 divergent in front and behind, only just reach a point level with the 

 anterior margin of the eyes. Antennae reach backwards as far as 

 the base of the 1st abdominal segment ; scape slightly thickened 

 towards the apex, and as long as the head, excluding the 

 mandibles. 



Pronotum two and a third times as long as the mesonotum. Epi- 

 notum laterally compressed, with a shallow but distinct longitudinal 

 groove in the middle, stretching from the base of the dorsum to the 

 brow of the declivity. The latter is very steep, and seen from 



