120 Bailey The American Voles of the Genus Evotomys. 



Evotomys wrangeli sp. nov. 



Type from Wrangel, Wrangel Island, Alaska. No. 74724, 9 ad., U. S. 

 Nat. Mus., Biological Survey Coll. Collected Sept. 1, 1895, by C. P. 

 Streator. Collector's number, 4835. 



Geographic distribution. Known only from Wrangel and Revillagigedo 

 Islands, southern Alaska. 



General characters. A large, dull-colored species entirely distinct from 

 any known form. Tail short, rarely twice as long as hind foot ; fur thick 

 and long in both young and adults collected early in September ; ears well 

 clothed with short hairs, distinctly rufous tipped. Side glands well de 

 veloped in one specimen of the series. 



Color. Dorsal area dull dark chestnut with a liver brown tone, cover 

 ing whole back from eyes to base of tail, including ears, and shading 

 gradually into the sepia gray of sides and cheeks ; sides more or less suf 

 fused with buffy yellowish ; belly dark plumbeous, washed with whitish 

 or buffy -ochraceous ; projecting part of ear and tuft of long hairs in front 

 of ear color of back; no postauricular spot; feet dusky gray in adults, 

 sooty in young; tail bicolor, soiled buffy below, blackish above, darker 

 and less distinctly bicolor in immature specimens. In one adult cf 1 , No. 

 74728, the white hairs covering the side glands form oval patches half an 

 inch in length. 



Cranial characters. Skull long and narrow', not thick or angular; ros 

 trum long and decurved; zygomata smoothly arched; nasals usually 

 notched, rarely truncate posteriorally, terminating on a line with pre- 

 maxillse ; frontals slightly concave posteriorally ; audital bulke of medium 

 size ; palatine bones short, anterior end rounded, posterior edge straight ; 

 lateral bridges complete before maturity ; incisors large, molar series long. 



Measurements. Average of 4 adults (2 $ and 2 9 ) from Wrangel : total 

 length, 147 ; tail vertebrae, 37 ; hind foot, 20. Skull of type : basal length, 

 24.3; nasals, 8 ; zygomatic breadth, 13.5; mastoid breadth, 11; alveolar 

 length of upper molar series, 5.5. 



Remarks. The above description is based on 18 specimens from Wrangel, 

 taken from September 1 to 12. The series includes specimens of every 

 size, from quarter-grown young to old adults, and shows very uniform 

 coloration, except the usual brightening with age and variation in color 

 of belly. Four specimens in worn summer pelage have the dorsal area 

 brighter chestnut and the sides decidedly more yellowish than in the rest 

 of the series. All of the specimens from Loring have the bellies strongly 

 washed with buffy-ochraceous, while more than half of those from 

 Wrangel have whitish bellies. 



In no way does E. wrangeli show a close relationship to any other Ameri 

 can species. In size and relative proportions it comes closest to E. dawsoni, 

 from which it differs widely in coloration and more widely in cranial 

 characters. With the long-tailed species south and east of its range there 

 is no need of comparison. 



Specimens examined. Total number, 35, from two islands on the coast 

 of Alaska: Wrangel, 18; Loring, 17. 



