_Antilope leptoceros_, =Geoffr. St.-Hil. et F. Cuv.= H. N. Mamm. (fol.) pls. 473, 474, livr. 72 (1842) (Sennaar?); =Wagn.= Schr. Säug. Suppl. iv. p. 422 (1844), v. p. 407 (1855); =Schinz=, Syn. Mamm. ii. p. 445 (1845); =id.= Mon. Antil. p. 34, pl. 38 (1848); =Sund.= Pecora, K. Vet.-Ak. Handl. 1845, p. 269 (1847); =id.= Hornschuch’s Transl., Arch. Skand. Beitr. ii. p. 265; Reprint, p. 85 (1848); =Gieb.= Säug. p. 309 (1853); =Heugl.= Reise N.O.-Afr. ii. p. 100, cum tab. (1877). _Gazella leptoceros_, =Temm.= Esq. Zool. Guin. p. 193 (1853); =Brooke=, P. Z. S. 1873, p. 543; =Lyd.= Horns and Hoofs, p. 234 (1893). _Gazella dorcas_, var. 4, =Gray=, Cat. Ung. B. M. p. 57 (1852). _Leptoceros abuharab_ et _L. cuvieri_, =Fitz.= SB. Wien, lix. pt. 1, p. 160 (1869). _Gazella loderi_, =Thos.= Ann. Mag. N. H. (6) xiii. p. 452 (1894) (Algeria); =id.= P. Z. S. 1894, p. 470, pl. xxxii. (animal); =Loder=, P. Z. S. 1894, p. 473 (habits); =Scl.= P. Z. S. 1895, p. 522 (Egypt); =Bramley=, P. Z. S. 1895, p. 863 (Egypt); =Scl.= P. Z. S. 1896, p. 780 (Viv. Soc. Zool.); =Pease=, P. Z. S. 1896, p. 813 (Algeria); =Whitaker=, P. Z. S. 1896, p. 816 (Tunis); =Ward=, Horn Meas. (2) p. 169 (1896). VERNACULAR NAMES:--_Abu el harabat_ or _Abu el haráb_ in Arabic (_Heuglin_); _Reem_ of Arabs in Algeria (_Loder_); _Ghazal abiad_ (White Gazelle) of Arabs in Tunis and Egypt (_Whitaker & Bramley_). Height of male at withers about 25 inches. General colour very pale sandy fawn, the Gazelline markings little defined. Central facial band and darker cheek-bands sandy, not rufous, and but little contrasting with the light facial streaks. Light lateral bands scarcely perceptible, and the darker ones below them only pale sandy with a tinge of brownish, as are the pygal bands, neither being much darker than the general dorsal colour. Ears long, narrow, pointed, pale whitish buff externally. Tail sandy at base, darkening terminally to brownish black. Front of fore limbs sandy, of hind limbs whitish; knee-brushes distinct, but little darker than the general colour. Hoofs variable in shape, those of specimens from the sandy regions of the Sahara much elongated, while in other regions they are of the usual shape. Skull of normal proportions; premaxillæ broadly articulating with nasals. Basal length in an old male 6·45 inches, greatest breadth 3·3, muzzle to orbit 3·6. Horns of male long, about twice the length of the skull, slender, closely and heavily ringed nearly to the tip. They are very variable as to their exact curvature, but are ordinarily rather straighter than in other species, curving but slightly backwards; they are near together basally, diverging above, sometimes very widely, so as to make them resemble divergent horns of _G. granti_ in miniature. _Female._ Similar to the male, but the horns, although nearly equally long, are much slenderer and even less curved than in the male.