NO. 7 ANTELOPES FROM BRITISH EAST AFRICA HELLER 1 3 



teeth and the obliteration of some of the sutures in their skulls, them- 

 selves really aged animals, and it is quite evident that the black livery 

 is 'to some extent an individual character, although chiefly an age 

 affair. Specimens identical in coloration with both A. nigroscapulata 

 and A. vaughani from the mouth of the Bahr-el-Ghazal are in the 

 Smithsonian African Collection shot by Colonel Roosevelt. Some of 

 the upper Nile specimens as well as the more remote ones from the 

 Guas Ngishu Plateau occasionally exhibit whitish ears with the dark 

 tips nearly obsolete. It is probable that somewhere in the upper 

 Bahr-el-Ghazal, perhaps near Meshra-er-Rek, the race here described 

 meets leucotis. The white-eared is without doubt local and confined 

 to the extreme northern limit of the range of the kobs in the Nile 

 Valley. Westward we find little or no change with the exception of 

 the restriction of the white orbital area in the coloration of the kobs 

 between the Lado and the Senegal and Nigerian regions, notwith- 

 standing" the vast extent of countrv. 



