PLATE XVIII. 
AIGOCERUS EQUINA._THE ROAN ANTELOPE, OR BASTARD GEMSBOK. 
Bastard Gemsbok of the Cape Colonists. Htak of the Matabili. - 
GENERIC CHARACTER.—Adult male about five. feet high at the shoulder, and nine in extreme length. General contour 
exceedingly stout and muscular.. Horns very robust, above two feet in length, strongly bent back scimitar-wise, rounded, and 
nearly parallel; with from twenty-five to thirty prominent rings, more remote as they recede from the orbits, and extending to 
within about four inches of the points. Face and head hoary black, with a large white streak before and behind each eye, 
formed of a pencil of long hairs. A white spot between the horns, and a white mouth and muzzle. Ears of asinine dimen- 
sions, full fourteen inches in. length, pointed, and the tips bent back very eccentrically; of a grey dun colour tipped with black. 
Tail descending to the hocks; slender, black, and tuftéd. Hide black. Hair coarse, fans scant, and undulating ; mixed red 
and white, ‘forming a roan or strawberry. Beneath the throat and neck idee and whiter, and towards the flanks often flea- 
bitten and clouded with sienna, which colour extends more or less over the lower portions of the. legs. “Neck furnished with 
a stiff upright mane, terminating at the withers. * Head large and heavy; nose abrupt; mouth extremely wide. A half muzzle. 
No suborbital sinus. 
Female similar, but hornless. Mamme two. Gregarious in small herds or families, but rare.  Inhabits chiefly the ele- 
vated ridges about the source of the Vaal and Limpopo rivers. 
