A Monograph of the Formicidae of South Africa. 121 



the legs are comparatively longer and more abundant than in 

 helvohis. 



The head is sub-rectangular, the posterior margin deeply excised, 

 the sides more or less feebly bisinuate. The mandible is acute at the 

 apex, with a pre-apical tooth at about the middle of the inner 

 margin, and a rudiment of a sub-apical tooth. The frontal carinae 

 are a little separated in front, but converge abruptly above the 

 antennal sockets, and each ends in a sharp spine pointing obliquely 

 backwards. 



The petiole is wider than long, widest posteriorly ; it is com- 

 paratively larger than in helvohis. The tooth-like projections of 

 the pygidium are not quite so prominent, otherwise similar to 

 helvolus. 



$ minor. 8-5'5 mm. Head, 2*6 mm. long x 2 mm. wide, to 

 1*7 mm. long x 1'4 mm. wide. The posterior margin of the head 

 is less deeply excised, the sub-apical tooth of the mandibles larger, 

 nearly equal to the pre-apical. The puncturation is finer, and the 

 pubescence a little more distinct, and the colour lighter than in 

 the 1/. 



$ minima. 3"5 mm. or less. In these the anterior margin of 

 the clypeus is more projecting, the frontal carinae are closer together 

 and less acute posteriorly, or in examples 3 mm. long, with the 

 spinous processes entirely obsolete. Antennae with 7-8 joints, all 

 the joints of the flagellum, except the 1st and last, much wider 

 than long. The whole body is shining, and the colour dirty 

 ochreous. 



$ . 22'2 mm. This is exceedingly like that of helvolus, differing 

 practically only in the following characters. 



It is a little smaller than helvolus, and the mesonotum is rather 

 narrower; according to Emery, the mesonotum is also more densely 

 clothed with both long and short hairs, but this character is perhaps 

 rather difficult to appreciate. The strongest distinction lies in the 

 shape of the stipites, seen from above. In this species the stipites 

 narrow gradually from base to apex, so that the lateral outline forms 

 a continuous curve ; in helvolus the stipites are narrowed in the 

 middle and widen out again beyond it, so that the profile is sinuate. 

 $ unknown. I am not aware of this species having been recorded 

 so far, from the region dealt with in this work, but have in- 

 cluded it as it may perhaps be found in the future within the 

 more northern parts of S. Ehodesia. It is a more northern 

 species, but has been recorded from the southern Belgian Congo. 



(G.A. coll.) 



