2G0 Mr. 0. Thomas on 



cream-bufF for tlieir middle zone, tlieir ends tawny, ■witliont 

 black tips. Under surface between bufFy and ochraceous buff. 

 Sides of neck and area round and over slioulders clear bufFy, 

 without tawny tips, this contrasting with the top of the neck, 

 which is darkened by the tawny ends of the hairs. Head 

 brown, becoming gradually tawny posteriorly. Hands and 

 feet buff. Tail dull bufFy or pinkish bufF, the end scarcely 

 darker. 



Skull about as in true A. litlledalei. 



Dimensions of tiie type (measured in the flesh) ; — 



Head and body 470 mm.; tail 220; hind foot 82; ear 28. 



Skull : upper length 95 ; basilar length 84 ; greatest 

 breadth 57 ; length of nasals 39 ; length of upper tooth- 

 row 21. 



JIab. as above. 



Ti/pe. Adult female. Original number 118. Collected 

 20th June, 1908. 



This is probably the marmot called A. caudatus by 

 SevertzofF. It has, of course, nothing to do with that species, 

 from which it is even further away than A. litlledalei, of 

 which I provisionally make it a subspecies. It is readily 

 distinguished from the latter by its paler ground-colour, the 

 prominent pale areas on the sides of the neck, and by the 

 absence of a black tip to the tail. 



An imperfect skin from Suok, N.W. Mongolia, presented 

 to the Museum by Mr. H. J. Elwes, would also appear to be 

 referable to this form. 



8. Arctomys centralis, sp. n. 

 Arctomys dickrous, Biichner, nee Anderson. 



(J . 121 (immature). Ak-sai Plateau, 120 miles N. of 

 Kashgar. 12,000'. 



A small species of a colour intermediate between the 

 brown marmots of the /ii7nalayanus group and the yellow ones 

 of the caudatus- litthdahi type. Fur of back for its basal 

 two-fifths blackish brown, then two-fifths cream-buff, the 

 terminal fifth dark brown. Belly strongly contrasted dark 

 rufous. 



Dimensions of the type (measured in skin) : — 



Head and body (stretched) 600 mm. ; tail 155. 



Skull : upper length 95 ; condylo-basal length 96 ; greatest 

 breadth 62"5 ; nasals 41 x 16 3 ; palatilar length 50 ; length 

 of upper tooth-series 24. 



Hah, Tian-shau. Type from Mt. Boro-choro. 



Type. Old male. B.M. no. 92. 1. 1. 5. Collected loth 



