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
horns of some length, present in both sexes, and of a longish tail. They are all African in range.
The type genus Hippotragus has its horns placed above the orbits; they are not twisted, but curved backwards. There are three species in the genus. Of these the best known is H. niger, the beautiful Sable Antelope. Its general colour is a rich, dark, glossy brown with white stripes on the face, and with a white belly. The other species are the Roan Antelope, H. equinus, and the Blaaubok, H. leucophaeus, of which the last specimen was probably killed in 1799.[[205]]
