FIELD BOOK OF MAMMALS 



vertebrse, 1.4 inches; hind foot, .8 inch. Found in the 

 Guadalupe Mountains, El Paso County, Texas; in Transi- 

 tion Zone. 

 MogoUon Mountain Meadow Mouse. — Microtus mogoUonen- 

 sis (M earns). 

 "Size small; tail and feet short; color dull rusty brown; fur 

 long and soft; ears not concealed. . . . Upperparts dull 

 rusty brown, brightest on tips of ears; sides slightly paler; 

 belly cinnamon or buffy gray; feet grayish brown; tail 

 brownish gray above, grayish below." (Bailey) Total 

 length, 5.2 inches; tail vertebrae, 1.14 inches; hind foot, .72 

 inch. Found in "Plateau country of central Arizona." 

 (Bailey) 



Xanthognathus Group 



Yellow-cheeked Meadow Mouse. — Microtus xanthognathus 

 (Leach). 

 Size very large; yellow on nose and ear patch; side glands 

 in adult males. Upperparts (early summer) dark sepia to 

 bister, heavily sprinkled with coarse, black hairs; bright 

 rusty yellowish on sides of nose and ear patch and a wash 

 of same shade about eye and on cheek; tail faintly bicolor, 

 blackish and dusky gray; feet soot}^; underparts dusky gray, 

 sooty on pectoral region. Total length, 8.6 inches; tail 

 vertebras, 2 inches; hind foot, 1.04 inches. Found in 

 "Northwestern Canada and Alaska, from central Alberta 

 north to the Arctic coast and west to central Alaska." 

 (Bailey) 



Chrotorrhinus Group 



Rock Vole. — < Microtus chrotorfhinus chrotorrhinus (Miller). 

 Resembling pennsylvanicus in size and general proportions, 

 but hind foot smaller, ears larger, and color much different. 

 Upperparts (summer) bright glossy bister sprinkled with 

 black; dull orange-rufous from nose to eyes; yellowish about 

 ears and rump; feet dark gray; tail above, grayish brown, 

 below, slightly paler; underparts dark gray. Winter 

 pelage darker and with more rusty above. Total length, 

 6.8 inches; tail vertebrae, 1.9 inches; hind foot, .78 inch. 

 Found in "Mount Washington, the Catskills, central 

 Quebec, and northern New Brunswick, in the Hudsonian 

 Zone." (Bailey) 



Gray Rock Vole. — Microtus chrotorrhinus ravus Bangs. 



Grayer than typical chrotorrhinus and more yellow on nose 

 and face. Upperparts (summer) grayish bister; yellowish 

 on nose, face, and rump ; feet buffy gray ; tail above, brown- 

 ish, below, slightly paler; underparts dark gray washed 

 with white. Total length, 6.5 inches; tail vertebras, 2 

 inches; hind foot, .86 inch. Found about Black Bay, 

 Strait of Belle Isle, Labrador. 



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