266 MICROTIN^ 



266. Evotomys dawsoni insularis Heller. 



1910. Evotomys dmosoni insularis Heller, Univ. Calif. Publ. Zool., 5, 

 p. 339; Miller, " List," 1912, p. 210; " List," 1924, p. 401. 



Type. — University of California Museum Vertebrate Zoology, 

 No. 557 ; adult male, collected June 20, 1908, by E. Heller. 



Type locality. — Canoe Passage, Hawkins Island, Prince William 

 Sound, Alaska. 



Range. — Kjiown from the type locality and from North-East 

 Bay, Hinchinbrook Island. 



Characters. — Size and proportion as in E. d. dawsoni. 



Colour : mantle ferruginous rufous from snout to base of 

 tail ; sides yellowish to level of ears ; under parts and feet light 

 greyish without any yellowish suffusion. A concealed whitish 

 spot at base of ear. Tail bicoloured, above reddish like the back, 

 below tawny brownish. 



Skull said to be distinguished from that of E. orca by its 

 greater zygomatic breadth, larger nasals, and conspicuously 

 larger auditory bullse. 



For external and cranial measurements, see table at end of 

 volume. 



27. Evotomys orca Merriam. 



1900. Evotomys orca Merriam, Proc. Washington Acad. Sci., 2, p. 24; 

 Miller, " List," 1912, p. 210; " List," 1924, p. 401. 



Type.—\J.^. Nat. Mus., No. 98028; adult female, collected 

 June 28, 1899, by A. K. Fisher. 



Type locality. — Orca, Prince William Sound, Alaska. 



Characters. — Size and proportions nearly as in E. dawsoni, but 

 colour darker and skull with still smaller auditory bullse. 



" Dorsal area dark chestnut or hazel; sides yellowish or buffy 

 drab, intimately mixed with black hairs and darkest on rump; 

 face very dark, grizzled with bufEy grey and black ; under parts 

 deep bufiy or buffy ochraceous, the plumbeous under fur showing 

 through; hind-feet dusky; tail above dusky from base to tip, 

 below buffy." 



Skull like that of E. daivsoni, with large subquadrate braincase 

 and strongly developed post- orbital squamosal crests; auditory 

 bullae decidedly smaller. Upper incisors decidedly larger. 

 Mandibular angular processes " less flaring." 



For external and cranial measurements, see table at end of 

 volume. 



28. Evotomys gapperi Vigors. 

 (Synonymy under subspecies.) 



Range. — Widely distributed in North America between 64° 

 and 40° N. latitude. 



Characters. — Essential characters of body, pelage, skull and 

 teeth substantially as in E. glareolus. 



