A Monograph of the Formicidae of South Africa. 501 



epinotuni very convex lengthwise in the $ major, barely convex in the 

 £ minor, about twice as wide as long, not much wider behind than in 

 front, ending in two very divergent spines, directed obliquely upwards, 

 distinctly curved inwards towards their extremity, and about one- 

 fourth as long as the space between their bases. First joint of 

 petiole trapezoidal, as wide as, or a little wider than long, the angles 

 widely rounded. Second node very shallowly grooved in the middle, 

 the groove becoming a little deeper behind, the hind margin emargi- 

 nate in the middle and very prominent when seen in profile. 



Victoria Falls. (S.A.M., R.M., G.A. colls.) 



Not unlike Neuvillei, race Cooperi, from which it may be dis- 

 tinguished by the shape of the mesonotum, the more prominent hind 

 margin of the 2nd node, and the 3rd-6th joints of the flagellum, 

 which in Cooperi are longer than wide. 



Fig. 35. — C. acaciae, race victoriosa. 



C. excisa, Mayr. 



Ann. K.K.N.H. Mus. Wien, vol. 10, p. 139, £, 1895. 



" £ . 3 - 5-3 - 8 mm. Bright rusty red, antennae and legs brown, 

 abdomen usually dark brown, the 1st segment either of a brownish- 

 red more or less all over, or only at the extreme base. Pilosity 

 altogether wanting ; the short decumbent pubescence is very sparse on 

 the head, thorax and petiole, less so on the abdomen and legs, more 

 abundant on the antennae. Mandibles quadridentate, sharply striate 

 longitudinally. The head is about as long as wide, or wider, the 

 cheeks close and finely longitudinally striate, the clypeus more or less 

 finely rugulose longitudinally, the anterior margin fairly straight, the 

 frontal area indistinctly defined, the frons between the frontal 

 carinae, and particularly in their immediate vicinity, finely and 

 longitudinally rugulose, in the middle shining and often smooth, 

 the back of the head shining and smooth, with very scattered 

 piligerous punctures ; laterally and near inner margin of the eyes 

 finely rugulose, behind the eyes finely coriaceous-rugulose, or almost 

 smooth. The scape of the 11-jointed antenna almost reaches the 

 posterior margin of the head, the 3rd-5th joints of the flagellum 

 wider than long, the two following joints about as long as wide, the 

 club distinctly 3- jointed. The eyes are placed a little behind the 



