A Monograph of the Formicidae of South Africa. 253 



more triangular, wider behind and narrower in front. Frontal sulcus 

 much deeper. The clypeus, which is more strongly and abruptly 

 truncate in front, has its upper surface strongly truncate and widely 

 emarginate, which is not the case in vidua. The frontal carinae short, 

 wide, and forming a marked lateral ridge, which is much more diver- 

 gent than in the type, where it is hardly apparent. The dorsum of the 

 epinotum is almost obsolete in the middle. The posterior metatarsi 

 very little shorter than the tibiae (much shorter in the type). Punc- 

 turation stronger, the punctures closer together and larger than in 

 vidua, especially on the thorax and abdomen. The mesonotum has 

 some diffuse but distinct rugae between the punctures. Pilosity and 

 pubescence a little less abundant than in the type. Dull rusty red, 

 slightly brownish. Abdomen, petiole, metanotum, three longitudinal 

 bands on the mesonotum and some vague spots on the sides of the 

 thorax and epinotum, dark brown. Deiilated." 

 Shiluvane. (H. Junod.) 



C. Arnoldi, Forel. 



(Oligomyrmex) Ann. Soc. Ent. Belg., vol. 57, p. 123, $ , 1913. 

 Santschi, Boll. Lab. Zool. Scu. Agric. Portici, vol. 8, p. 363, 1914. 



5 . P7-P9 mm. Pale ochreous yellow ; the teeth of the mandibles 

 brownish. Smooth and shining. Head and anterior half of the pro- 

 mesonotum finely and sparsely punctured, the punctures regularly 

 spaced and distinct. Pubescence yellowish and long ; not very dense 

 on the head and thorax ; more abundant and much longer on the 

 abdomen. Mandibles with three distinct and acute teeth, and some- 

 times with a trace of a fourth tooth posteriorly. The dorsal profile of 

 the thorax slopes in a continuous and slightly convex line, broken 

 only at the meso-epinotal suture, from front to back. This, and the 

 slightly longer pubescence and pilosity, are the only differences which 

 I am able to see between this species and the £ ^ of vidua, (from 

 Hartley S. P.), described in the preceding pages. Since the latter 

 were taken with the ? ? and $ <$ , which are typical vidua, Smith, 

 I believe that there can be no doubt as to the correctness of the 

 identification. In those specimens the dorsal profile of the thorax is 

 inclined backwards as far as the meso-epinotal suture, beyond which 

 it rises along the dorsum of the epinotum, the latter shorter than the 

 declivity. On the other hand, the <£> $ from the "Victoria Palls, also 

 taken with typical $ ? and $ $ of vidua, have the declivity as long 

 as, or a little longer than, the dorsum, therein agreeing with Santschi's 

 description of vidua. The dentition on which that author bases the 



