VERNACULAR NAMES:--_Arab_ or _Harab_ at Massowa, _Bus-Adu_ in Danakil, _Om-Sabah_ in Arabic (_Heuglin_); _Aoul_ of Somalis (_Swayne_). Size large, height at withers 35½ inches in an old male of the Somali subspecies. General colour very pale fawn, and very uniform everywhere, as there are neither light nor dark lateral bands nor any pygal bands. Central facial band black or blackish fulvous, contrasting markedly with the white lateral facial streaks. Dark facial streaks also black, but very narrow. Sides of muzzle black, continuous with the central facial band. Back of ears whitish, margined and tipped with black. White of rump very broad and extended, projecting far into the body-colour, which it broadly shuts off from the tail. The latter is white basally, black tufted terminally. Knee-brushes present, whitish or fawn. Basal length of skull 8·85 inches, greatest breadth 4·2, muzzle to orbit 5·4. Horns long, nearly circular in section, heavily ringed. In the typical subspecies they are but little divergent for their basal half, but then curve widely outwards above, their tips being again abruptly hooked inwards so as to point almost directly towards each other. In the Somali subspecies their length is greater and their divergence is quite even, not increasing above, so that their upper portions are not nearly so widely separated; their tips also hook rather forwards, and not so directly inwards. _Female_ similar to the male, but the horns much thinner and less rough, though almost as long as those of the male. In both of the subspecies their curvature is closely similar to that found in their respective males. _Hab._ Coastland of Red Sea from Suakin south to Tajurah (subspecies _typica_); Northern Somaliland (subspecies _berberana_). This fine Gazelle was one of the many discoveries made in North-east Africa by the great traveller and naturalist Edouard Rüppell, and was first described and figured by Cretzschmar in the ‘Atlas’ which illustrated the zoological portion of Rüppell’s ‘Reise.’ The species was dedicated to Ritter Samuel Thomas von Soemmerring, on the occasion of that savant attaining the fiftieth year of his Doctorate--an event which was celebrated by the Senckenbergian Naturalists’ Society of Frankfort-on-the-Main on the 7th of April, 1828. The original specimens were procured by Rüppell on the eastern slope of the Abyssinian coast-range, and were deposited along with all his other collections in the Senckenbergian Museum. In a _résumé_ of his knowledge of the East-African Antelopes contained in a subsequent work on the Vertebrates of Abyssinia, Rüppell tells us that he only met with this species in the bush-clad valleys of the Abyssinian coast, but that it was said to occur also on the large island of Dahalak off Massowah. It was generally observed in small families, which, however, sometimes congregated into larger herds. [Illustration: Fig. 81.