A Monograph of the Formicidae of South Africa. 189 



parallel- sided and with the posterior margin shallowly concave in the 

 forms with blunt mandibles, or slightly narrower in front than behind, 

 in those with acute teeth on the mandibles ; the latter also have the 

 posterior margin of the head more deeply concave. Forms inter- 

 mediate in respect to the mandibular structure and the shape of the 

 head also occur. Head much wider than the thorax, very convex 

 transversely. Mandibles tridentate, the masticatory margin straight 

 and with very small blunt teeth, or, more or less oblique, and with the 

 teeth stronger and acute. The internal margin of the mandibles is 

 more or less swollen. Clypeus short, slightly raised in the middle, the 

 anterior margin feebly concave at each side. Frontal carinae short, 

 close together and parallel. Antennae 6- jointed, the scape short, only 

 just reaching the internal margins of the eyes when extended sideways; 

 flagellum very little longer than the scape, the 1st joint as long as the 

 2nd and 3rd together and a little longer than wide, 2nd joint as long 

 as wide at its apex, 3rd joint a little shorter than the 2nd, wider than 

 long, 4th joint twice as wide as long, 5th joint narrowing to the apex, 

 half as long again as wide, and quite twice as long as the 4th. Eyes 

 small, oval, situated far forwards, composed of about 15 facets, and 

 separated from the base of the mandibles by a distance less than their 

 own long diameter. Thorax rectangular, the corners rounded, nearly 

 parallel-sided, or only very slightly wider in front than behind, convex 

 longitudinally and transversely, the declivity vertical, the brow strongly 

 rounded. 



First joint of the petiole triangular, longer than wide, widest behind. 

 Second joint transverse, two and a quarter times wider than long, its 

 posterior face coalesced on the whole surface with the abdomen. 

 Abdomen ovate, all the segments wider than long. 



Legs short, the femora swollen, the 1st tarsal joint (metatarsus) of 

 the front pair of legs sub-ovate, wider than the tibia, the other tarsal 

 joints very short. The metatarsus of the middle pair of legs cylindrical, 

 as thick as and two-thirds as long as the tibia. Metatarsus of hind 

 pair of legs slightly compressed, a little wider than the tibia, and like 

 the middle metatarsi, furnished with a series of minute teeth round 

 the outer half of the apex. 



? . 4 mm. Mandibles with masticatory margin oblique and acutely 

 dentate. Eyes large, the facets clearly defined ; three ocelli present 

 and well developed. Head narrower in front than behind, posterior 

 angles more pronounced than in the £ , and posterior margin much 

 mox-e deeply emarginate. Pronotum not greatly exposed, not as high 

 as the mesonotum and three times wider than long. Mesonotum 

 convex above, but as long as wide, the sides smooth, the central area 



