Boselaphus oreas, Gray, Cat. Ost. B. M. p. 145 (1847).
Boselaphus derbianus, Gray, Ann. Mag. Nat. Hist. xx. p. 286 (1847); id. Silliman’s Amer. Journ. v. p. 279 (1848); id. P. Z. S. 1850, p. 144; id. Ann. Mag. Nat. Hist. (2) viii. p. 226 (1851); id. Knowsl. Menag. pl. xxv. (1850); Gerv. H. N. Mamm. ii. p. 201, pl. xxxviii. (1855); Fitz. SB. Ak. Wien, lix. pt. 1, p. 179 (1869).
Oreas derbianus, Gray, Knowsl. Menag. p. 27 (1850); id. Cat. Ung. B. M. p. 136 (1852); Gerr. Cat. Bones B. M. p. 245 (1862); Winwood Reade, P. Z. S. 1863, p. 169, pl. xxii.; id. ‘Savage Africa,’ p. 398 (cum tab.) (1864); Gray, Cat. Rum. B. M. p. 47 (1872); id. Hand-l. Rum. p. 118 (1873); Rochbr. Faune Sénégamb. p. 120, pl. vii. fig. 2 (1883); Jent. Cat. Ost. Leyd. Mus. (Mus. Pays-Bas, ix.) p. 141 (1887); Ward, Horn Meas. pp. 165–168 (1892), p. 211 (1896); Lyd. Horns and Hoofs, p. 260 (1893); id. Royal Nat. Hist. ii. p. 273 (1894); Pousargues, Ann. Sci. Nat. iv. p. 81 (1897); Scl. P. Z. S. 1898, p. 349 (horns).
Antilope (Taurotragus) derbianus, Wagn. Sehr. Säug., Suppl. v. p. 439 (1855).
Taurotragus derbianus, Lyd. & Bryden, in Ward’s Great and Small Game of Afr. p. 439, pl. xii. fig. 2 (1899).
Oreas colini, Rochbr. Bull. Soc. Phil. Paris, (7) vii. p. 8 (1883); id. Faune Sénégamb. p. 121, pl. vii. fig. 1 (1883).
Vernacular Names:—Gingi-ganga or Djik-i-junka of the Mandingoes of Senegambia (Whitfield and Winwood Reade).
Exact height at withers unknown, but probably equal to, if not exceeding, that of the preceding species (70 inches). Forehead covered with hair of a rich ruddy-brown hue, extending from the base of the horns to a point below the level of the eyes; nose black; sides of the head dusky brown or dark fawn; a whitish stripe running inwards and forwards from the inner edge of the eye on each side; upper lip and chin white. Ears large and expanded, much larger than in the other species; the margins broadly white in front and ornamented on the lower side with a large black patch; the posterior surface mostly black, brownish at the base. Neck covered with long hair of a dark brown or black colour, blacker towards the shoulder than in front; base of the neck bordered by a white collar, directed obliquely upwards and backwards at least halfway up to the withers. Body of a rich ruddy fawn-colour, becoming paler or nearly white below, the middle of the belly black; a broad black stripe of longer hairs extending all down the spine from the neck to the root of the tail; sides of the body and haunches ornamented with thirteen or fourteen narrow white stripes, commencing at the dorsal stripe above and gradually fading away on the lower part of the belly and hind-quarters. Legs down to the knees and hocks of the same colour externally as the body, whitish on the inner side; there is a large black patch on the fore leg above the knee on the posterior and inner sides. Horns very large and massive, diverging from the base, the divergence in some cases amounting almost to a right angle; length of horns up to about 34·25 inches.
Female. Smaller than the male, and without the mat of hairs on the forehead; horns smaller and less divergent than in the male, but much more strongly twisted and crested than in the females of the other species.
Hab. Senegal and the Gambia Colony.