120 Annals of the South African Museum. 



D. beaunsi, Emery. 

 Zool. Jahrb. Syst., vol. 8, p. 718, % % , 1895. 



This species is exceedingly similar to helvolus, differing from it 

 chiefly in the shape of the head, which in the 1/ 1/ and larger $ $ 

 is distinctly wider in front than behind, the sides converging 

 posteriorly, so that the occipital margin is rendered shorter. The 

 puncturation of the vertex is also shallower and sparser in all the 

 £ $ , but in specimens determined as Braunsi for me by Dr. Forel, 

 I do not find that the smallest workers (2*8 mm.) have the sides of 

 the head entirely smooth as described by Prof. Emery. The 1/ 2/ 

 do not exceed 8 mm. in length. The colour, especially of the larger 

 forms, is slightly darker than in helvolus ; otherwise similar to that 

 species. 



Bulawayo. (E.M., G.A. colls.) 



D. affinis, Shuckard. (Plate IV., fig. 35.) 



Ann. Nat. Hist., vol. 5, p. 316, $ , 1810. 



Mayr (Typhlopone oraniensis, var. brevinodosa), Verh. Zool. Bot. 

 Ges. Wien, vol. 12, p. 737, % , 1862. Emery, Mem. Accad. 

 Sc. Bologna, Ser. 5, vol. 9, p. 421 ; 2/ , g , 1901. 



The g S of this species are very similar to those of helvolus and 

 brevipennis ; helvolus is more strongly and closely punctured on the 

 head, and does not reach to such a large size in 1/ or £ maxima. 

 From brevipennis, the workers of this species can be distinguished 

 only with difficulty, the main distinction being the shape of the 

 petiole, as given in the key above. 2/ or g maxima. 10-11 mm. 

 Head, from 3 - 3 mm. long x 2*6 mm. wide, to 3 - 7 mm. long x 

 2 - 8 mm. wide. The colour is like that of helvolus ; the abdomen is 

 lighter than the thorax. Head shining, mandibles finely reticulate 

 and sparsely punctured ; dorsum of the pro- and mesonotum smooth, 

 epinotum reticulate and dull, the opacity being due to a microscopic 

 rugulosity. The puncturation on the thorax is shallower and less 

 abundant than on the head. The petiole is duller than the thorax, 

 and the puncturation feebler and less regular. The abdomen is 

 shining, shallowly and sparsely punctured. All the punctures bear 

 short hairs, intermixed with which on the abdomen are some longer 

 semi-erect hairs. There are a few pilose hairs on the ventral surface 

 of the abdomen, the clypeus, mandibles and pygidium ; the hairs on 



