SJNG-SING WATERBUCK 



179 



And, fourth, the defassa sing-sing {C. defassa typicus), extending from 

 Western Abyssinia through Sennar, Kordofan, and the valley of the 

 White Nile to Uganda and British and German East Africa, in which 

 the ears are longer and more pointed, and there is more white in the 

 region of the eye than in the other races ; the general colour being 

 rufous. The four races are frequently regarded as distinct species, but 

 they are so evidently local modifications of a single somewhat variable 

 form that it appears far preferable to include them all under a single 

 specific heading. 



1 Mr. F. R. Hicks favours me with this measurement. 



