GAZELLE-LIKE FORMS 



313 



Ammodorcas is closely allied to the Gazelles, but differs from 

 them iu having an elongated neck and also a long tail. A. 

 clarkei, the only species, is limited to Somaliland. 



Lithocranius, not unlike the last, has a still longer neck, 

 which makes it almost Giraffe-like ; its tail, however, is short. 

 The scientific name is derived from the " solid stony character of 

 the cranium." In running, this Gazelle carries the head forward 

 in a straight line with the body. It is African. 



Borcotragus with one species, D. megalotis, is a pigmy Gazelle 

 restricted to Somaliland. Its likeness, on account of size and in 

 some other superficial features, to the Klipspringer, led to its 

 original confusion with that genus {Oreotragus). 



A sub-family Hippotraginae, or Hippotragine section, includes 



Fig. 162, — Sable Antelope. Hippotragus nicjer. x -j^. The horns of the specimen 

 figured have not nearly reached their full dimensions. 



a number of Antelopes which agree in the possession of four 

 mammae, and of molars more like those of the true Oxen, of 



