Genus I. HIPPOTRAGUS. 
Type. 
Egocerus, Desm. Mamm. i. p. 475 (1822) (nec Aigoceros, Pall. 
Zool. Ross.-As. i. p. 224 (1811) yee ty pL. LEVCOPH AUS: 
Aigocerus, H. Sm. Griff. An. K. v. p. 324 (1827) ere H. LEUcOPHEUS. 
Hippotragus, Sund. Pecora, K. Vet.-Ak. Handl. 1844, p. 196 (1846). H. LEUCOPHAUS. 
Ozanna, Brehm, Thierl. iii. p. 227 (1880) (in synonymy) . H. NIGER. 
Size large; form high and comparatively slender, less stout and bovine 
than in the succeeding genera. Muzzle hairy. Tail long and tufted. 
Mamme 4. Large accessory hoofs present. 
Skull proportionally long, its frontal region very convex upwards, the large 
horn-cores rising almost vertically above the posterior half of the orbits. 
Lachrymal fissures almost or quite obsolete. No anteorbital fossa. 
Premaxille not reaching to the nasals. 
Horns medium or long, slightly but evenly divergent, nearly vertical 
basally, strongly curved backwards above ; heavily ringed. 
Female with horns similar to those of the male, but shorter, slenderer, and 
much smoother. 
Range of the Genus. Africa south of the Sahara, but not occurring in the 
great Congo Forest. 
Of this genus, which contains some of the handsomest Antelopes in 
existence, we recognize three species, one of them (alas!) now extinct. 
The widely distributed Roan Antelope may be provisionally separated into 
four local subspecies, which require further elucidation. 
A. General colour greyish or pale brown. Horns not or but little longer 
than the head. 
a. Size smaller. Face without black markings . 110. ZH. leucopheus. 
b. Size larger. Face with strongly contrasted black and white markings. 
lll. H. equinus. 
B2 
