Anteorbital fossæ of skull very large, their edges sharply ridged above and below. Anteorbital vacuities small. Nasal bones long. Horns about three-quarters the length of the skull, slanting backwards, slightly or heavily ridged basally, smooth at the tip, but the different species vary considerably in the amount of ridging on the horns. _Distribution._ Africa south of the Atlas. The members of this genus are remarkably uniform in character, and there are scarcely any characters of importance to distinguish from each other species so widely distant geographically as the Oribis of the Gambia, Abyssinia, Zambesia, and the Cape. The following are the groups into which they seem best to fall:-- A. Horns comparatively slender and smooth, their basal two inches only slightly ridged. _a._ Tail markedly black, tufted. _a^1._ S. African 41. _O. scoparia_. _b^1._ Zambesian 42. _O. hastata_. _c^1._ Gambian 43. _O. nigricaudata_. _b._ Tail scarcely black-tipped.--Abyssinian. 44. _O. montana_. B. Horns thicker, heavily ridged for more than half their length. 45. _O. haggardi_. 41. THE CAPE ORIBI. OUREBIA SCOPARIA (SCHREB.). _Antilope ourebi_, =Zimm.= Geogr. Gesch. iii. p. 268 (1783); =Shaw=, Gen. Zool. ii. pt. 2, p. 320 (1801); =Huet=, Bull. Soc. Acclim. 1887, p. 89. _Scopophorus ourebi_, =Gray=, Ann. Mag. N. H. (1) xviii. p. 232 (1846); =id.= Knowsl. Men. p. 7 (1850); =id.= P. Z. S. 1850, p. 118; =id.= Ann. Mag. N. H. (2) viii. p. 136 (1851); =id.= Cat. Ung. B. M. p. 73 (1852); =Gm.= Cat. Bones Mamm. B. M. p. 235 (1862); =Fitz.= SB. Wien, lix. pt. 1, p. 165 (1869); =Gray=, Cat. Rum. B. M. p. 19 (1872); =id.= Hand-l. Rum. B. M. p. 90 (1873). _Calotragus oureby_, =Temm.= Esq. Zool. Guin. p. 191 (1853). _Antilope scoparia_, =Schreb.= Säug. pl. cclxi. (animal) (1785); =Afz.= N. Act. Ups. vii. p. 220 (1815); =Desm.= N. Dict. d’H. N. (2) ii. p. 194 (1816); =id.= Mamm. ii. p. 464 (1822); =Desmoul.= Dict. Class, i. p. 446 (1822); =Goldf.= Schr. Säug. v. p. 1244 (1824); =Burch.= List Quadr. pres. to B. M. p. 7 (1825); =H. Sm.= Griff. An. K. iv. p. 244, v. p. 339 (1827); =Less.= Man. Mamm. p. 379 (1827); =Licht.= Darst. Säug. pl. xiii. (♂ & ♀) (1828); =J. B. Fisch.= Syn. Mamm. p. 469 (1829); =Smuts=, En. Mamm. Cap. p. 78 (1832); =Less.= Compl. Buff. x. p. 290 (1836); =Oken=, Allg. Nat. vii. p. 1362 (1838); =Gerv.= Dict. Sci. Nat. Suppl. i. p. 262 (1840); =Less.= N. Tabl. R. A., Mamm. p. 177 (1842); =Wagn.= Schr. Säug. Suppl. iv. p. 429 (1844), v. p. 411 (1855); =Schinz=, Syn. Mamm. ii. p. 414 (1845); =Gieb.= Säug. p. 316 (1854). _Antilope_ (_Ourebia_) _scoparia_, =Laurill.= Dict. Univ. d’H. N. i. p. 623 (1839).