DUIKERS AND SMALL ANTELOPES 539 
stomach contents to consist chiefly of the twigs and leaves 
of the alpine shrub, Alchemilla 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 nyansce 
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 
Sylvieapra grimmia roosevelti 
Native Names: Dinka, amook; Bongo, deelg. 
Sylvicapra grimmia roosevelti Heller, 1912, Smith. Misc. Coll., vol. 60, No. 
8, p. 9. 
Range. —Erom the Albert Nyanza northward over the 
lowlands of the Nile drainage as far as the limits of the 
