EVOTOMYS 243 



Type locality. — Aoyama, Hokkaido, Japan. Altitude 400 

 feet. 



Range. — Hokkaido, Japan. 



Characters. — Resembling E. glareolus in general appearance. 

 Size medium (hind-foot 17 mm.; condylo-basal length of skull 

 24-7 mm.). 



Rufous mantle covering the whole top of head and breadth of 

 back, fairly well defined laterally, especially on the fore-quarters ; 

 rather redder than in E. glareolus, approaching " hazel " of Ridg- 

 way. Sides greyer. Belly washed with pale buff, not sharply 

 defined laterally. Ears bright rufous. Hands and feet pale 

 brownish-white above. Tail of medium length, well-haired and 

 tufted, dark brown above, dull white below, the terminal tuft 

 black above, whitish below. 



Skull rather flatter than in E. glareolus, with a low weak muzzle 

 and less convex frontal contour. Palatal foramina longer. 

 Choanae broad and low, their structure as usual. Compared with the 

 skull of E. amurensis that of E. mikado is considerably larger, with 

 slightly less expanded zygomata, narrower interorbital region and 

 braincasc, shorter molars, diastema, and nasals ; nasals ex- 

 panded anteriorly, but with straight lateral borders ; rostral 

 protuberances very salient ; auditory bullae rather large. 



Cheek-teeth (Fig. 78, 6, 7) with the same essential pattern as in 

 E. glareolus but, like those of E. amurensis, showing a remarkable 

 antero-posterior compression, great breadth, and unusually sharp 

 salient angles; m^ very complex with four outer and five inner 

 salient angles. 



For external and cranial measurements, see tables at end of 

 volume. 



D. — nifocanus group. 

 22. Evotomys rufocanus Sundevall. 



(Synonymy under subspecies.) 



Type locality. — ^Lappmark, Sweden. 



Range.- — Northern Europe and Asia including Japan. In 

 Europe southwards to Dovre, Norway; in Asia to the Syansk 

 Mountains, Lake Baikal, Mongolia, Shansi, Korea, and south- 

 wards to Sze-chwan and Hupeh. Inhabiting Saghalien and 

 ranging throughout Japan from Hokkaido southwards to Kiushiu 

 and Shikoku. 



Characters. — A robust species with massive skull and heavy 

 Microtus-like cheek-teeth which, however, develop roots when 

 perfectly mature. 



Size large (hind-foot 17-21 mm.; condylo-basal length of 

 skull in adults with rooted molars 25-3-28-5 mm. or more). 

 Tail varying in length, in different subspecies, from about one- 

 third to about two-thii'ds of the length of the head and body. 



