Ammodorcas is closely allied to the Gazelles, but differs from them in 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.
Dorcotragus 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).
Fig. 162.—Sable Antelope. Hippotragus niger. × 1⁄20. The horns of the specimen figured have not nearly reached their full dimensions.
A sub-family Hippotraginae, or Hippotragine section, includes a number of Antelopes which agree in the possession of four mammae, and of molars more like those of the true Oxen, of
