Genus I. OREOTRAGUS 3 40. THE KLIPSPRINGER. _Oreotragus saltator_ (Bodd.). [Plate XXV.] 5 Genus II. OUREBIA 13 41. THE CAPE ORIBI. _Ourebia scoparia_ (Schreb.) 15 42. PETERS’S ORIBI. _O. hastata_ (Pet.) 21 43. THE GAMBIAN ORIBI. _O. nigricaudata_ (Brooke). [Plate XXVI.] 23 44. THE ABYSSINIAN ORIBI. O. montana (Cretzschm.) 25 45. HAGGARD’S ORIBI. _O. haggardi_ (Thos.) 29 Genus III. RAPHICERUS 33 46. THE GRYSBOK. _Raphicerus melanotis_ (Thunb.). [Plate XXVII. fig. 2.] 35 47. THE STEINBOK. _R. campestris_ (Thunb.). [Plate XXVII. fig. 1.] 41 48. NEUMANN’S STEINBOK. _R. neumanni_ (Matsch.) 47 Genus IV. NESOTRAGUS 49 49. THE ZANZIBAR ANTELOPE. _Nesotragus moschatus_, von Düb. [Plate XXVIII.] 51 50. LIVINGSTONE’S ANTELOPE. _N. livingstonianus_, Kirk 55 Genus V. NEOTRAGUS 50 51. THE ROYAL ANTELOPE. _Neotragus pygmæus_ (Linn.). [Plate XXIX.] 61 Genus VI. MADOQUA 67 52. SALT’S DIK-DIK. _Madoqua saltiana_ (Blainv.). [Plate XXX.] 69 53. SWAYNE’S DIK-DIK. _M. swaynei_, Thos. 73 54. PHILLIPS’S DIK-DIK. _M. phillipsi_, Thos. [Plate XXXI. fig. 2.] 75 55. THE DAMARAN DIK-DIK. _M. damarensis_ (Günth.) 79 56. KIRK’S DIK-DIK. _M. kirki_ (Günth.) 83 57. GÜNTHER’S DIK-DIK. _M. guentheri_, Thos. [Plate XXXI. fig. 1.] 89 Subfamily IV. CERVICAPRINÆ 93 Genus I. COBUS 95 58. THE COMMON WATERBUCK. _Cobus ellipsiprymnus_ (Ogilby). [Plate XXXII.] 97 59. THE SING-SING. _C. unctuosus_ (Laurill.). [Plate XXXIII.] 105 60. CRAWSHAY’S WATERBUCK. _C. crawshayi_, Scl. [Plate XXXIV.] 109 61. PENRICE’S WATERBUCK. _C. penricei_, Rothsch. [Plate XXXV.] 113 62. THE DEFASSA WATERBUCK. _C. defassa_ (Rüpp.). [Plate XXXVI.] 115