Maininah fro/n Central Asid. 39'.) 



slightly less than in M. sikimensis. Fur of medium length ; 

 hairs of back about "J-IO nun. in length (summer). General 

 colour above near broccoli-brown, not of such a warm tone as 

 in M. a</res(is -inongol. Under surface washed with pale 

 drab, llaiuls and t'ect dull whitish. Tail pale brown above, 

 whitish below, the two colours not sharply contrasted. 



iSkull on the whole lil^e that of a large M. agrestis, higli^ 

 with well-marked angles and a long waist. Lateral pits of 

 posterior palate large, deep, the septum between them reduced 

 to a mere linear ridge. Bulhe fairly large, rather larger 

 than in Euro])ean agresfis, decidedly smaller than in M. ti. 

 mongol, much larger than in M. tiikimensis. 



Teeth on the whole as in JJ. agrestis, the extra prism on 

 »r well developed, but, as in M. sikimensis, there is also an 

 extra postero-interiial angle on m^, though rather smaller than 

 in that species. M^, in the single specimen, almost exactly 

 as tigured by Blasius in his M. " campestris " (fig. 208, p. 375), 

 a rudimentary fourth external angle similarly present, and no 

 doubt equally variable. JYj also about as in " canipestris," 

 though the three elements of the anterior trefoil are more 

 nearly shut off from each other. 



Dimensions of the type (measured in flesh) : — 



Head and body 109 mm. ; tail 44; hind foot 18"5 ; ear 13. 



Skull : condylo-basal length 26'8 ; condylo-incisive length 

 27'5; zygomatic breadth 15'5; length of nasals 7'5; poste- 

 rior breadth on lips of meatus 13; height of muzzle 4*7 ; 

 palatilar length 14"2 ; diastema 8 ; palatal foramina 5*7 ; 

 upper molar series (crowns) 6'5. 



Hah. & Tgjye as above. 



This species is no doubt a member of the agrestis group, 

 but shows an interesting approximation to M. sikimensis by 

 possessing an extra cusp on m^ as well as on wt^, no other 

 true Microtus being known in which both cusps are present. 

 It has, however, nothing of the peculiar coppery colour of 

 iM. sikimensis, and its bulla? are much larger than is the case 

 in that animal. 



The Chinese M. millicens, also with an extra cusp on m-, 

 as in M. agrestis, is in all other respects quite a different 

 vole, and in no way nearly allied to the present species. 



27. Microtus {Stenocra/iius) tianshanicus, Biichn. 



S . 210. Great Altai, eastern slopes (Suok). 7000'. 



cJ. 221. Great Altai East (Chagan Kol). 8000'. 



S. 222, 223. Great Altai West (Kran Valley). 8000'. 



