EVOTOMYS 241 



by Wosnesscnsky, in 1845; Nos. 443 and 7583; both young 

 (examined by the Hon. Ivor Montagu). 



Type local it II. —" Ivamtschatka." 



Range. — Ivamtschatka. Common on the mainland and upon 

 Bchring Island. 



Characters. — Size small (hind-foot 16-18 mm. ; condylo-basal 

 length of skull 22-23 mm.) ; tail short, averaging about 30% 

 of the head and body length. Fur short, hairs on back in 

 December specimen about 8 mm. in length ; tail well clothed with 

 stiff bristly hairs forming a terminal pencil about 6 mm. long; 

 soles thinly haired from heel to middle row of pads. 



Colour bright; mantle well defined laterally, extending from 

 crown of head to root of tail, brightest in winter when the tint is 

 near cinnamon-rufous, whereas in autumn and summer it is a 

 clear deep tawny. Cheeks and flanks much greyer and paler, but 

 distinctly tinged with ochraceous buff. Under surface grey, 

 irregularly darkened by slaty bases of hairs, with or without a 

 more or less well-marked buff suffusion. Tail slender, less densely 

 haired than in E. rutilus, bicoloured, reddish or tawny like the 

 back above, clear cream-buff below. Feet and hands whitish. 

 Immature specimens much darker and duller. 



Skull slightly narrower and more depressed than in E. rutilus, 

 with the rostral protuberances large and placed relatively far 

 forwards. Auditory bullae very small, not large as in E. rutilus. 

 Cheek-teeth of normal pattern ; m^ with the third inner fold and 

 fourth inner angle usually more or less well developed. 



For external and cranial diviensions, see tables at end of 

 volume. 



Remarks. — This well-marked member of the rutilus group is 

 perhaps best characterized by its small auditory bullae, very 

 bright, narrow and sharply contrasted rufous mantle, short and 

 rather thin fur. The colour and pelage, particularly the extent to 

 which the tail and feet are clothed, are subject apparently to a 

 good deal of seasonal change, which is but imperfectly understood, 

 and perhajis is comj^Hcated by the house-haunting habits of the 

 species. Some interesting notes by Mr. N. G. Buxton ujion the 

 food-stores and general habits of this vole have been pubUshed by 

 Allen in the 2>aper cited above. 



19. Evotomys jochelsoni Allen. 

 1903. Evotomys jochelsoni Allen, Bull. Amer. Mus. N.H., 19, p. 148. 



Type. — American Museum N.H., No. 19538; adult female, 

 collected, February 1902, by W. Jochelson, of the Jessup North 

 Pacific Expedition. 



Type locality. — Verkhne KoHmsk, middle Kolyma River, 

 N.E. Siberia. 



Characters. — Size small (hind-foot 17 mm. ; total length of 

 skull 22 mm.). Back from front of crown to tail, bright rufous, 



