DUIKERS AND SMALL ANTELOPES 539 



stomach contents to consist chiefly of the twigs and leaves 

 of the alpine shrub, Alche7nilla argyrophylla. At Voi the 

 stomach contents of one individual consisted of the leaves 

 and fruit of a native cucumber. Duikers are silent ani- 

 mals without any alarm or recognition notes. 



Duikers are finished skulkers and hiders. They lie 

 motionless, with neck outstretched, until the hunter is very 

 close, if they think themselves concealed; and if they be- 

 come suspicious they are adepts at sneaking quietly out 

 of sight behind some bush and then making off rapidly 

 through the cover for several hundred yards. 



Key to the Races of grimmia 



Ears shorter, less than 4 inches in length 



Body size smaller, skull less than 6 inches in length; lower part of 

 feet brownish-drab roosevelti 



Body size larger, skull 6 inches or greater in length; lower part 

 of feet fuscous-brown nyanscs 



Ears longer, exceeding 4 inches in length 



Pelage long and heavy, much vermiculated with black or dark 

 brown; lower part of feet black altivallis 



Pelage shorter and more uniform with very little blackish ver- 

 miculation; feet fuscous or seal-brown 

 Dorsal color tawny or ochraceous-tawny hindei 



Dorsal color buff deserti 



Nile Bush Duiker 

 Sylvicapra grimmia roosevelti 



Native Names: Dinka, amook; Bongo, deelg. 



Sylvicapra grimmia roosevelti Heller, 1912, Smith. Misc. Coll., vol. 60, No. 

 8, p. 9. 



Range. — From the Albert Nyanza northward over the 

 lowlands of the Nile drainage as far as the limits of the 



