109. Horns and feet of Speke’s Sitatunga 154 110. Speke’s Sitatunga, ♂ & ♀ 156 111. Outer view of right foot of Selous’s Sitatunga, ⅓ t. size 158 112. Horns of Congan Sitatunga 167 113. Head of the male Cgan Sitatunga, from the specimen in the British Museum 169 114. Male and female Kudu 183 115. Horns of Lesser and Greater Kudus 188 116. Skull and horns of Livingstone’s Eland, ♂ 205 117. Horns of _Taurotragus oryx gigas_ 208 118. Abnormal horns of female Eland 209 119. Herd of Derbian Elands 218 120. Horns of Derbian Eland 219 121. Front view of the horns of the Derbian Eland 221 THE BOOK OF ANTELOPES. VOL. IV. Subfamily VI. _HIPPOTRAGINÆ._ _General Characters._—Size large. Muzzle hairy. Anteorbital glands absent. Tail long, more or less tufted. Mammæ 4. Skull heavily built; without supraorbital pits, with small or no lachrymal fissures, and without anteorbital fossæ. Molars very high and broad, and with accessory internal columns; therefore very similar to those of the Bovinæ, the subfamily containing the Oxen. Horns long, straight, curved, or spiral; present and of approximately equal dimensions in both sexes. _Range of Subfamily._ Ethiopian Region—Africa south of Atlas and Arabia. This subfamily contains some of the largest and finest Antelopes in existence. Three genera are usually recognized, which may be distinguished as follows:— A. Horns straight or curved, not twisted. Hoofs normal. _a._ Horns placed above the orbits, starting nearly vertically upwards and then curving strongly backwards 1. Hippotragus. _b._ Horns placed behind the orbits, slanting backwards nearly in the line of the face 2. Oryx. B. Horns spirally twisted, placed as in _Oryx_. Hoofs broadly rounded. 3. Addax. GENUS I. HIPPOTRAGUS. Type. _Egocerus_, Desm. Mamm. ii. p. 475 (1822) H. leucophæus. (nec _Ægoceros_, Pall. Zool. Ross.-As. i. p. 224 (1811) _Aigocerus_, H. Sm. Griff. An. K. v. p. 324 (1827) H. leucophæus. _Hippotragus_, Sund. Pecora, K. Vet.-Ak. Handl. H. leucophæus. 1844, p. 196 (1846). _Ozanna_, Brehm, Thierl. iii. p. 227 (1880) H. niger. (in synonymy) Size large; form high and comparatively slender, less stout and bovine than in the succeeding genera. Muzzle hairy. Tail long and tufted. Mammæ 4. Large accessory hoofs present.