ANTILOPINiE 41 



6. Pace-markings distinct ; size larger. 



«'. "White area on buttocks larger; forehead 



and muzzle rufous G. yarhandensis. 



b\ White area on buttocks smaller ; forehead 



greyish, muzzle white G. seistanica. 



B. Females horned ; no goitre in males ; white area 

 on buttocks usually smaller. 

 a. No puffy elevation on nose. 



a". Forehead white ff. marioa. 



V. Forehead coloured. 



a^. General colour very pale, flank and pygal 

 bands practically obsolete; horns long 



and slender O. leptoceros. 



v. General colour darker; horns shorter 

 and stouter. 

 a?. Flank-band generally more or less 

 indistinct, never wholly black. 

 a*. A more or less distinct nose-spot. 

 a^. Flank-band, pygal band, and nose- 

 spot faint and ill-defined; coat 

 smooth, 

 a^. Size larger ; forehead light 

 rufous, lips and tip of muzzle 

 whitish ; horn-tips slightly in- 

 turned G. fuscifrons. 



V. Size smaller ; forehead and 

 muzzle dark rufous ; horn-tips 



not perceptibly inturued G, bennetti. 



b^. Flank-band, pygal band, and nose- 

 spot much darker. 



a. Coat rough ; horns nearly 



straight, 

 a'. Size larger (26-7 in. at shoul- 

 der) G. cuvieri. 



6'. Size much smaller G. gazella. 



b. Coat smooth. 



a'. Size larger (24-5 in. at shoul- 

 der) ; horn-tips not inturned G. arabica. 



v. Size smaller (21-2 in. at shoul- 

 der) ; horn-tips strongly in- 

 turned G. muscatensis. 



6*. Nose-spot variable, often absent. 



a. Nose - spot usually present ; 



general colour rufous fawn ; 

 flank - band dusky rufous ; 

 horns short, with tips hooked 

 inwards; size smaller G. Kttoralis. 



b. Nose - spot usually absent ; 



general colour sandy fawn ; 

 flank-band indistinct ; horns 



