224 MICROTIN^ 



Type.—BM., No. 12.4.1.85; adult female, skin and skull, 

 collected June 7, 1910, by Douglas Carruthers. 



Type locality. — Syansk Mountains, 100 miles west of Lake 

 Baikal. Altitude 1600 feet. 



Range. — -Known only from the type locality, where it is found 

 together with E. rutilus and E. rufocanus (see Thomas, Ann. 

 Mag. N.H., [8], 9, pp. 397, 398). 



Characters. — Size small (hind-foot 16 mm. ; condylo-basal 

 length of skull 22-1—23 mm.). 



Colour much as in dark European forms (e.g., E. glareolus 

 hritannicus and E. g. suecicus). Rufous mantle narrower, so that 

 grey flanks are more evident in dorsal view ; head also greyer and 

 less rufous. Sides and under surface dark grey in adults ; light 

 silvery grey in a young specimen. Belly with but little buffy 

 suffusion. 



Skull considerably smaller than in equal-aged E. g. hritannicus, 

 with slightly less expanded zygomata, shorter nasals, slightly 

 longer diastema and with the braincase a little shorter and broader. 



Cheek-teeth normal; -m^ in adults without a fourth inner 

 salient angle or third inner infold, but both structures feebly 

 represented in the young specimen. Anterior root of m^ shows a 

 distinct trace of the originally separate fang supporting the 

 second inner prism. 



For external and cranial measureinents, see tables at end of 

 volume. 



3. Evotomys centralis Miller. 



1906. Evotomys centralis Miller, Ann. Mag. N.H., [7], 17, p. 372; 

 Thomas, ihid., [8], 13, p. 568. 



T^/joe.— B.M., No. 5.12.4.14; adult male, collected by Mr. 

 A. B. Bayley Worthington, Sept. 24, 1904. 



Type locality. — Koksu Valley, Thian-Shan Mountains. 

 Altitude 9000 feet. 



Range.- — Known only from the type locality. 



Characters. — Size small (hind-foot 17 mm. ; condylo-basal 

 length of skull 23 mm.), tail short (about 41% of head and body 

 length). Fur unusually long, dense and soft; hairs of back 

 about 14 mm. in length. General colour pale and dull. Mantle 

 rather narrow, yellowish-brown, conspicuously lined by dusky 

 hair-tips. Face, flanks and rumjJ ashy grey, slightly tinged with 

 yellowish. Under parts whitish grey, rather heavily washed 

 with buff, and not sharjaly contrasted with flanks. Tail very 

 heavily haired, conspicuously pencilled, and sharply bicoloured ; 

 sooty black above and at tip, buffy-white below. Hands and feet 

 soiled white above. Feet darkened on outer side of ankles. 



Skull, compared with E. g. hritannicus of equal age, slightly 

 larger, with narrower braincase, shorter molars, longer nasals and 

 diastema. Zygomata a little less expanded anteriorly. 



