ANTELOPES. 



41 



islands at the entrance to the harbour of Zanzibar, where it can 

 obtain no water, except such rain or dew as may fall on the leaves, 

 for many months. In these islands the Antelopes live entirely on 

 leaves and twigs of trees and scrub, never touching the wiry grass 

 with which parts are covered. 



The Grysbok and From the other members of the Neotragince [Case 56.] 



the Steinbok. with naked muzzles and no glandular spot below 

 Genus RaphicerOS. the ear, the Grysbok, Raphiceros melanotis 



(I 157) , and the Steinbok, R. campestris (1 158), are distinguished by 

 the nearly vertical direction of the horns ; while they are further 

 characterised by the small size of the depression in the skull for 

 the reception of the gland below the eye. The Grysbok possesses 

 lateral hoofs, but these are absent in the Steinbok. The Steinbok 

 is one of the most common Antelopes of South Africa, frequenting 

 the open plains either singly or in pairs. It commences feeding 

 about sundown, and continues its wanderings through the night, 

 retiring to the cover afforded by a bush or patch of tall grass for 

 repose during the day. These Antelopes run with great speed. 

 There is more than one species of Steinbok. 



The Oribi Antelopes. T ne species of Oribi, as typified by the South [Case 56.] 

 Genus Oribia, African Oribia oribi (1160), differ from the 

 Or Olirebia. other Neotragina with poiuted hoofs and 

 naked muzzles by the presence of a bare glandular spot below each 

 ear. As additional distinctive features, may be noticed the 

 presence of lateral hoofs, and the large size of the depression in 

 the skull for the gland below the eye. The horns are generally 

 about three-quarters the length of the skull, and have a variable 

 number of ridges at the base. Oribis are inhabitants of open 

 country, and abundant in South and East Africa. Although absent 

 from the West Coast and the Congo districts, they reappear in the 

 open country of Gambia and Senegal, where they are represented 

 by O. nigricaudata (1161). In the South African Oribi there are 

 tufts of long hair on the knees, which are wanting in the Gambian 

 species. 



The Dik-dik Antelopes The various East and Nort h-East African [Case 56.] 

 small Antelopes known as Dik-diks differ 

 Genus Madoqua. f rom tbe other members of the Neotragina 

 by their elongated and hairy noses, and likewise by the tuft of 



