6 
the ranges of the different species nowhere overlap each other, whilst almost 
every part of the range of the genus possesses its single representative 
species. 
Ihe members of the genus fall into four rather definite groups, as follows :— 
A. Frontal horn-pedicle short; horns forming a U when viewed in 
front . . . . . . 1,2. B. buselaphus, B. major. 
B. Horn-pedicle moderate ; horns forming an inverted bracket: ~V~. 
3, 4,5. B. tora, B. swaynet, B. coke. 
C. Horn-pedicle extremely elongated; horns forming a V when viewed 
in fromt. . 3 25. 16,1. Bacaama eb: Jacksoni. VLU OW 
D. Horn-pedicle very short and broad; horns much curved inwards 
towards each other before the final backward turn. 
8. B. lichtensteini. 
