158 Annals of the South African Museum. 



from the very oblique declivity ; the whole epinotum is a little longer 

 than the mesonotum. Petiole flattened, acuminate at the base, 

 widest below the middle. Abdomen ovate, overhanging the petiole. 

 Legs short, all the femora rather broad. 



? . 3'5 mm. (Hitherto undescribed.) Black ; head and thorax 

 very smooth and shining, very sparsely pubescent. The pubescence 

 very fine and short, arising on the head from microscopic punctures ; 

 thorax impunctate. Abdomen dull, and similar to that of the £ , but 

 larger. Tibiae and femora shining. Head, excluding the mandibles, 

 two and one-fifth as long as wide, parallel-sided, somewhat flat 

 above, the posterior angles rounded, the posterior margin straight. 

 Eyes moderately large, situated within the anterior third of the 

 head ; ocelli small, set rather far back. Antennae 11-jointed ; the 

 length of the scape is less than the width of the head, the flagellum 

 about one-third longer than the scape. Clypeus convex in the 

 middle, the anterior border feebly emarginate in the middle. 

 Mandibles sparsely but rather strongly punctured, elongate, the 

 external margin twice as long as the masticatory, which is furnished 

 with numerous small teeth and a large apical tooth. Pronotum 

 very convex transversely in front, and sloping steeply downwards 

 towards the neck from the level of the pro-mesonotal suture. Meso- 

 notum flattened, about as long as wide ; scutellum less than half as 

 long as the mesonotum ; epinotum one and a half times wider than 

 long, the brow of the very short and vertical declivity is polished 

 and shining. Wings with a yellowish tint, nervures ochreous, 

 1 closed cubital and 1 radial cell. 



This sex differs remarkably from the $ , particularly in the shape 

 of the head, so much so that if it had not been taken with the $ $ 

 and $ $■ in large numbers in the same nest it might reasonably have 

 been ascribed to a different genus. 



$ . 2*1 mm. Black ; mandibles, antennae, and legs brownish. 

 Shining and impunctate, the pubescence very short and sparse. 

 Head as long as wide between the eyes, where it is widest ; dis- 

 tinctly narrowed in front of the eyes and contracting towards the 

 hind margin. Mandibles about half as long as the head, similar 

 to those of the ? . The scape does not reach the occipital margin, 

 it is half as long as the flagellum. Eyes large, situated just within 

 the anterior half of the head, occupying about one-quarter of the 

 sides. Ocelli small, hardly raised. There is a short median longi- 

 tudinal impression between the posterior margin of the clypeus and 

 the anterior ocellus. Clypeus rounded and raised in the middle, the 

 anterior margin feebly convex. Seen from above, the pronotum is 



