4 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. OO 



larger bulla; ; of quite different proportions than skull of campbelli; 

 longer and narrower ; audital bullse large. 



Measurements of type.— Head and body, 102 mm. ; tail vertebrae, 

 13; hind foot, 13.5, without claws. Skull: Greatest length, 27; 

 condylobasal length, 25 ; zygomatic breadth, 13 ; nasals, 11.1 ; interor- 

 bital breadth, 3.7 ; breadth of braincase, 11.1 ; upper tooth row, 4.0. 



Remarks. — A series of seventeen specimens of Phodopus crcpi- 

 dafus was collected. The species seems to have no nearer known 

 relative than P. campbelli, from northeastern Mongolia, which it 

 resembles much more than it does songarus of the Siberian plains. 

 It inhabits the isolated Chuisaya Steppe, near the Mongolian border, 

 between the Kurai Mountains and the frontier range. 



OCHOTONA NITIDA, sp. nov. 



Type from Tchegan-Burgazi Pass, Altai Mountains, Siberia (near 

 Mongolian border, south of Kosh-Agatch) . No. 175390, United 

 States National Museum ; skin and skull ; adult $. Collected July 

 8, 1912, by N. Hollister. Orig. No. 4257. 



General characters. — Differs from Ochotona alpiiia. its nearest 

 relative, in smaller size, smaller skull, and darker coloration ; with 

 more dark reddish-brown and blackish above, and less yellowish 

 below, in fresh fall pelage. Lining of ear cream-buff, not black as 

 in alpina; soles of feet considerably darker, almost black. 



Color. — Fresh fall pelage : General color of upperparts dark 

 mummy brown, a mixture of russet and black ; nose, cheeks, and area 

 behind ear lighter. Ears outside blackish-brown ; inside pale cream 

 buff, with no black, a faint narrow band of brownish bordering the 

 rim of huffy. Sides bright cinnamon, with less blackish and brown 

 than back, blending into the pure cinnamon of lower sides and under- 

 parts. Hands and feet grayish-buffy, the soles of feet blackish, not 

 brown as in alpina. Summer specimens in the long left-over winter 

 coat are much lighter, and lack most of the blackish and cinnamon 

 color. The underfur is broadly dark slate; the individual hairs 

 banded with cream buff and tipped with black-. The type specimen 

 shows both pelages, the animal having renewed the coat on the for- 

 ward half of body. 



Measurements of type- Head and body, 208 mm. ; hind foot, 30. 

 Skull : ( )ccipitonasal length, 47.6; condylobasal length, 43.6; greatest 

 breadth, 22.4; length of nasals, 15; least interorbital constriction, 

 5.1 ; length of upper tooth row, 8.5 ; lower tooth row, 8.5. 



