new Gazelle from Central Arabia. 163 



is, barely reaches to the level of the anterior canthus, the 

 whole forehead, over an area roughly corresponding to the 

 frontal bones, being white. Ears long, their backs uniformly 

 pale fawnish white. Body pale fawn, of about the tint of 

 G. dorcaSj much paler than in the dark G. muscatensis. 

 Pale lateral band scarcely visible ; dark lateral band and 

 pygal band pale brown, little marked, scarcely darker than 

 the dorsal colour. Limbs whitish or very pale fawn through- 

 out ; distinct knee-tufts present. 



Skull of about the size and proportions of that of G. dorcas, 

 but the nasals are longer and the premaxillae shorter; the 

 nasal opening is consequently shorter and also broader. 

 Posteriorly the nasals are more broadly rounded. Bullae 

 much inflated. 



Horns unfortunately not perfectly describable, as in the 

 only old male they have had their ends cut off, and the type 

 is rather immature. So far as can be seen, however, they 

 are of a somewhat lyrate shape, short, not very strongly 

 curved backwards, and with their ends turned inwards towards 

 each other. Female with horns of the usual proportions. 



As to measurements, the distance from the calcaneum to 

 the tip of the hoof round the curve is 305 millim., the same 

 measurement in G. muscatensis being about an inch less. 

 The ears, moistened, are about 135 millim. from notch to tip. 



Skull of the type : basal length 150 millim. ; greatest 

 length 167; greatest breadth 77; nasals, length 57, breadth 

 22 ; nasal opening 42 x 24 ; gnathion to orbit 88 ; gnathion 

 to front of tooth-row 36 ; palate length 86. 



The horns of the type are just 200 millim. (8 inches) in 

 length round the curve outside, and, judging from comparison 

 with the older specimen, would have probably become about 

 a couple of inches longer. 



Hob. Nejd, Central Arabia. 



Type Brit. Mus. 97. 1. 14. 5. 



Dr. Jayakar says in his letter : " Among the mammals 

 are four Keem Gazelles from the Nejd desert, and one from 

 Dahireh, the north-western district of Oman. It is probable 

 that the species extends down to the desert behind Oman, 

 as that is continuous with the Nejd desert." 



No described species really needs any detailed comparison 

 with G. marica, which differs from nearly all known Gazelles 

 by its obsolete face- markings. Of the few species similarly 

 pale-faced, G. leptoceros and Loderi are much larger and 

 have wholly different elongate horns, and G. gutturosa, sub- 

 gutturoscij and picticaudata have hornless females. 



