Horns of medium length, evenly divergent, curved upwards and forwards throughout their length, except just at their bases. Female hornless. _Range of the Genus._ Restricted to Somaliland. One species only. [Illustration: THE BOOK OF ANTELOPES, PL. LXXIII. _J Smit del et lith_ _Hanhart imp._ The Dibatag. AMMODORCAS CLARKEI. _Published by R. H Porter_] 107. THE DIBATAG. AMMODORCAS CLARKEI (THOS.). [PLATE LXXIII.] _Cervicapra clarkei_, =Thos.= Ann. Mag. N. H. (6) vii. p. 304 (1891). Gazelle from Somaliland allied to _Lithocranius_, =Scl.= P. Z. S. 1891, p. 197. _Ammodorcas clarkei_, =Thos.= P. Z. S. 1891, p. 207, pls. xxi. & xxii. (head and skull); =Scl.= P. Z. S. 1892, p. 101; =Ward=, Horn Meas. (1) p. 128 (1892), (2) p. 173 (1896); =Lyd.= Horns and Hoofs, p. 240 (1893); =Scl.= P. Z. S. 1892, pp. 101 & 118; =Swayne=, P. Z. S. 1895, p. 318 (habits); =id.= Seventeen Trips to Somaliland, p. 310 (1895); =Hoyos=, Zu den Aulihan, p. 181 (1895); =Elliot=, Publ. Chicago Mus., Zool. i. p. 124 (1897). VERNACULAR NAME:--_Dibatag_ of Somalis (_Clarke_, _Swayne_, _and others_). Height at withers about 31 inches. General colour of body dark purplish rufous, no dark or light lateral or pygal bands present. Head with handsome sharply-defined Gazelline markings; the central facial band rich fulvous rufous, no darker spot on muzzle; light facial streaks long, sharply defined, and extending to the sides of the muzzle, pure white; areas round eyes and ears also whitish, though not sharply defined, connected with each other and continuous with the white facial streaks. Dark facial streaks present but not prominent. Back of ears dull whitish. Chin and interramia white. Cheeks below white markings, throat, and whole of neck dark purplish rufous, continuous with the back. Belly pure sharply-defined white, but on the chest this colour is broken by two projections running down from the dark throat-colour on each side of the middle line to between the elbows. Limbs, except their inner sides above, coloured like the back, but gradually passing lower down into fulvous instead of rufous. Knee-brushes present but small. Back of hams white, the white not projecting into the dark body-colour. Tail long, well-haired, but not crested, blackish above and below, except just at its base. Skull-dimensions in an adult male:--Basal length 7·5 inches, greatest breadth 3·7, muzzle to orbit 4·2. Horns attaining about 11 or 12 inches in length; their basal halves broadly ringed, their long forwardly-directed terminal halves smooth and evidently corresponding to the short smooth recurved tips of ordinary Gazelline horns. _Female._ Similar to the male, but without horns. _Hab._ Eastern parts of Central Somaliland, restricted to the Dolbahanta and Marehán countries S.E. of Berbera.