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A. Arabiea, Hemprich and Ehrenb. Symb. Phys. t. 5 ; Licbt. Saugth. 
t. 6.— A. Cuvieri, Ogilby, Proc. Zool. Soc. 1840, 35; Frazer. Zool. 
JLypica, t. 
Var. Nose with a dark spot or streak. 
Var. Larger, legs thicker. 
Gazella Boreas, var. Gray, Knowsley Menag. t. 3. 
Inhabits N. Africa; shore of Red Sea; Mogador ( Wiltshire ). 
The Earl of Derby has specimens which he calls Gazella vera, 
figured Knowsley Menag. t. 3 ; they are rather larger, greyer, and 
the legs are much thicker and heavier than the specimens from the 
shore of the Red Sea. The fur is similar, but not quite so long on 
the under side of the neck. The Kevel gris (F. Cuvier, Mam. Lith.) 
well represents this variety. 
The A. Cuvieri of Ogilby, from Morocco, is a much larger animal 
than the common G. Boreas, but agrees with it in other characters, 
except, it is said, in having longer ears. 
M. F. Cuvier (Mam. Lithog. vii. t. 8. ? .) has figured and described 
an Antelope from Sennaar under the name A. leptoceros, which he 
says is very like A. Boreas, but has larger horns, those of the males 
being twice and of the females half as long again as the head. The 
horns vary greatly in length in our specimens. 
ft Upper part of sides with a pale streak. 
2. Gazella Isabella. The Isabella Gazelle. 
Fur short, very soft; pale yellowish brown, with a broad, rather 
paler oblique streak on the upper part of the side ; knee-tufts, front 
of face and lower face-streak, darker yellow brown ; upper face-streak, 
chest, back edge of tarsus, under side of feet, inside of limbs, belly 
and vent, white ; tail black. Female, horns very slender, longer than 
the head. Young, paler, the lower part of the sides rather darker. 
Gazella Isabella, Gray, Ann. and Mag. Nat. Hist. 1846.— Anti¬ 
lope Iridis (Bie Iris Antelope), Licht.— A. Boreas, Licht. Darstell. 
t. 5.— A. Boreas, var. a. Sundevall. 
Inhabits N. Africa ; Egypt (J. Burton, Esq.), Kordofan ( Sundev.). 
This species is easily known from the foregoing by the softness and 
fineness of the fur, and the lower side-streak being of the same colour 
as the back, and from it and the following by having no dark edge to 
the anal disc. 
3. Gazella subgutturosa. The Jairon. 
Pale brown; upper part of sides with a broad, rather paler streak ; 
erown and knee-tufts greyer ; face-streak indistinct; nose, lower part 
ot sides, belly, hinder side of fore and front side of hinder limbs and 
anal disc white ; streak on haunches dark brown ; end of tail blackish. 
Antilope subgutturosa, Guldenst.; Pallas ; FI. Smith, Griff. A. K. 
t. 183. f. 5, horns.— Capra Ahu, Kcemp.— A. Boreas, var. persica , 
Riippell. —Gazella subgutturosa, Gray, K. Men. 4. 
Inhabits Tartary, Armenia and North Persia. Cab. Brit. Mus. 
Larger than the Chikara. 
No. CCVIII. —Proceedings of the Zoological Society, 
