Of the West-African _H. e. gambianus_ the series in the National Collection comprises a pair of frontlets (♂ et ♀) from Gambia (_Whitfield_) presented by Lord Derby, a scalp and skull from the Upper Gambia presented by Dr. Percy Kendall (above referred to), and the specimen from the Niger presented by Capt. Richardson. This series, as is evident, is quite insufficient to solve the vexed question as to the amount of distinctness of the four geographical forms or subspecies, which must remain open for future investigators. Our illustration of the adult male of this Antelope (Plate LXXVII.) was put on the stone by Mr. Smit, about twenty years ago, from a water-colour sketch by Mr. Wolf. It is now impossible to ascertain from what specimen this sketch was taken, but it is conjectured to have been from a skin and skull procured by Mr. Selous in S.E. Africa. At the same time a wood-block of the head (fig. 90, p. 29) was drawn, which shows well the essential differences between the Roan Antelope and the Sable Antelope (see fig. 91, p. 38). _January,_ 1899. [Illustration: THE BOOK OF ANTELOPES, PL. LXXIX. _Wolf del. J. Smit lith._ _Hanhart imp._ The Sable Antelope. HIPPOTRAGUS NIGER. _Published by R.H. Porter_ ] [Illustration: THE BOOK OF ANTELOPES, PL. LXXX. _H. Leutemann del. J. Smit lith._ _Hanhart imp._ The Sable Antelope, ♀ _et vit_ HIPPOTRAGUS NIGER. _Published by R.H. Porter_ ] 112. THE SABLE ANTELOPE. HIPPOTRAGUS NIGER (Harr.). [PLATES LXXIX. & LXXX.] _Aigocerus niger_, =Harris=, P. Z. S. 1838, p. 2 (Jan. 9); =id.= Tr. Z. S. ii. p. 213, pl. xxxix. (1838); =id.= Portr. Wild Anim. S. Afr. p. 126, pl. xxiii. (1840); =Gray=, List Mamm. B. M. p. 158 (1843); =id.= Knowsl. Men. p. 17 (1850); =id.= P. Z. S. 1850, p. 133; =id.= Cat. Ung. B. M. p. 104 (1852); =Harris=, Wild Sports S. Afr. (ed. 5) pp. 216 & 349, pl. xxii. (1852); =Gerrard=, Cat. Bones Mamm. B. M. p. 240 (1862); =Scl.= P. Z. S. 1864, p. 103 (Kazeh, _Speke_); =Kirk=, P. Z. S. 1864, p. 658 (Zambesia); =Fitz.= SB. Wien, lix. pt. 1, p. 177 (1869); =Gray=, Cat. Rum. B. M. p. 35 (1872); =id.= Hand-1. Rum. B. M. p. 103 (1873); =Huet=, Bull. Soc. Acclim. (4) iv. p. 480 (1887); =Jent.= Cat. Ost. Leyd. Mus. (Mus. Pays-Bas, ix.) p. 135 (1887); =id.= Cat. Mamm. Leyd. Mus. (op. cit. xi.) p. 166 (1892). _Antilope nigra_, =Gerv.= Dict. Sci. Nat., Suppl. i. p. 265 (1840); =Laurill.= Dict. Univ. d’H. N. i. p. 618 (1841); =Wagn.= Schr. Säug., Suppl. iv. p. 484 (1844), v. p. 436 (1855); =Schinz=, Syn. Mamm. ii. p. 442 (1845); =id.= Mon. Antil. p. 38, pl. xliii. (1848); =Peters=, Säug. Mossamb. p. 190 (1852).