_a2._ Hairs on throat long, frequently forming a median tuft or beard; nasal patch black, united on both sides with the lower end of the ocular stripe and passing beneath the jaw, so as to form a complete black ring round the white muzzle; a black stripe above the knee on the fore leg, extending on the outer side almost to the shoulder; a large black patch on the rump; a black stripe above the belly on both sides continued on to the thigh, and there united with a large patch of the same colour, which covers the hind leg, both outside and inside, almost down to the hocks; a black patch or stripe on the front of the cannon-bone of the hind leg. 115. _O. gazella._ _b2._ Hairs on throat short, not forming a tuft or beard; nasal patch not meeting the ocular stripe, so that the muzzle is not circumscribed by a continuous black band; black stripe above the knee on the fore leg only extending about halfway up to the shoulder; hind-quarters of a nearly uniform tawny tint, without any black patches on the rump or thighs; lateral stripe above the belly not passing on to the thigh; hind legs without any black bands or stripes. _a3._ Black hairs on the ears not produced into a tuft; parting of the hairs on the dorsal median line lying far back upon the rump. 116. _O. beisa._ _b3._ Hairs on the ears produced into a long black tuft; parting of the hairs along the spine situated a little behind the middle of the back. 117. _O. callotis._ [Illustration: THE BOOK OF ANTELOPES, Pl. LXXXI _Wolf del. Smit lith._ _Hanhart imp_ The Leucoryx. ORYX LEUCORYX _Published by R. H. Porter._ ] 113. THE LEUCORYX. ORYX LEUCORYX (Licht.). [PLATE LXXXI] _Algazel_, =Buff=. Hist. Nat. xii. pp. 211 & 272, pl. xxxiii. figs. 1 & 2 (horns) (1764). _L’Algazelle_, =F. Cuv.= H. N. Mamm. i. pl. 376 (1819) (Senegal). _Antilope gazella_, =Pall.= Spic. Zool. fasc. xii. p. 17 (1777) (nec _Capra gazella_, Linn.); =Kerr=, Linn. An. K. p. 316 (1792); =Daudin=, in Lacépède’s Buffon, xiv. p. 182 (1799); =Bechst.= Syst. Uebers. vierf. Th. ii. p. 642 (1800); =Desm.= N. Dict. d’H. N. (1) xxiv. Tabl. p. 32 (1804); =Goldf.= Schr. Säug. v. p. 1182 (1819); =Schinz=, Cuv. Thierr. i. p. 394 (1821); =Desmoul.= Dict. Class. d’H. N. i. p. 444 (1822); =Desm.= Mamm. ii. p. 475 (1822); =Savi=, Isis, 1832, p. 499; =Rüpp.= N. Wirbelth. p. 16 (1835); =Oken=, Allg. Naturg. vii. p. 1396 (1838); =F. Cuv.= Index to H. N. Mamm. p. 5 (1842); =Wagn.= Schr. Säug. Suppl. iv. p. 481 (1844); =Schinz=, Syn. Mamm. ii. p. 437 (1845); =Gieb.= Säug. p. 295 (1853). _Cerophorus_ (_Oryx_) _gazella_, =Blainv.= Bull. Soc. Philom. 1816, p. 75.