DESCRIPTION OF A NEW GAZELLE FROM NORTH- 

 WESTERN MONGOLIA 



By N. HOLLISTER 



Among - specimens of the great game of the Altai, collected by Dr. 

 Theodore Lyman in 191 2 for the United States National Museum 

 and the Museum of Comparative Zoology at Harvard, is a new 

 gazelle from Mongolia, which may be known by the following 

 description : 



PROCAPRA ALTAICA, new species 



Type from Suok Plains, near south end of Bain-Chagan Pass. 

 Little Altai, Mongolia. United States National Museum, No. 175 179, 

 skin and skull of adult male. Collected July 5, 19 12, by Theodore 

 Lyman. (Orig. No. 4382 N. H.) 



General characters. — Nearest to Procapra gutturosa, but with 

 colored area of back more extensive ; skull broader ; molar teeth 

 larger ; and horns much more spreading. 



Color of type (in summer coat). — General color of upperparts 

 and sides, ochraceous-buff ; face from nostrils to between eyes drab, 

 sharply cut off from buff of sides of muzzle and head, which blends 

 into the white of chin and upper throat. Ears scantily haired with 

 light buff ; small rump patch of white, sharply marked by the brown 

 spot on the spike-like tail. Outside of legs light buff, with a shading 

 of drab near hoofs. Underside of neck buff ; underparts of body 

 and insides of legs white, sharply marked from buff of sides of body 

 and outer sides of legs. 



Skull, teeth and horns. — -Compared with skulls of Procapra gut- 

 turosa from the Mongolian Plateau, north of Kalgan, China, the 

 skull of this new gazelle is generally heavier and broader, especially 

 broader across middle of maxillary region ; basioccipital short and 

 square ; mandible weak, the horizontal rami very low and slender. 

 Teeth larger, the upper row shorter, but the molars considerably 

 wider; m s with posterior column 11.5 millimeters across, as against 

 8.8, 9.3, and 9.4 in specimens of gutturosa, Posterior lobe of m 3 not 

 directly in line with interior cusps of molar row, as in gutturosa, but 



Smithsonian Miscellaneous Collections, Vol. 60, No. 19 



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