RED-BACKED MOUSE 



Species and Subspecies of the Genus Evotomys. 



Gapper Red-backed Mouse. — Evotomys gapperi gapperi 

 (Vigors). 

 As just described. Found "From Massachusetts, New 

 Jersey, and Pennsylvania northward and from the Atlantic 

 coast westward to the Rocky Mountains in Canada." 

 (Bailey) 



White Mountain Red-backed Mouse. — Evotomys gapperi och- 

 raceiis Miller. 

 Slightly larger than typical gapperi, duller and paler. 

 Dorsal area poorly defined, dull rusty rufous; sides buffy 

 clay color. Total length, 6 inches; tail vertebrae, 1.6 

 inches; hind foot, .76 inch. Found in "The White Moun- 

 tains of New Hampshire and (probably eastward to) 

 Nova Scotia." (Bailey) 



Rhoads Red-backed Mouse. — Evotomys gapperi rhoadsi Stone. 

 Resembling typical gapperi but dorsal stripe slightly darker. 

 Upperparts chestnut; sides buffy gray. Total length, 5.6 

 inches; tail vertebrae, 1.5 inches; hind foot, .8 inch. Found 

 in region about Mays Landing, Atlantic County, New 

 Jersey; limits of range unknown. 



Loring Red-backed Mouse. — Evotomys gapperi loringi Bailey. 

 Size small, color bright. Upperparts (winter) pale reddish 

 hazel; sides ashy; feet and underparts white; tail bicolor, 

 blackish brown and whitish. Summer pelage dark rich 

 chestnut above. Total length, 5 inches; tail vertebras, 

 1.3 inches; hind foot, .7 inch. Found in "Timbered valleys 

 along edge of plains in Minnesota and eastern North and 

 South Dakota." (Bailey) 



Athabasca Red-backed Mouse. — Evotomys gapperi athahascce 

 Preble. 

 Resembling typical gapperi in size but lighter colored. 

 Upperparts as in typical gapperi, but face and sides grayer ; 

 underparts white. Total length, 5.8 inches; tail vertebrae, 

 1.6 inches; hind foot, .72 inch. Found in vicinity of 

 Fort Smith, Slave River, Mackenzie, Canada. 



Gale Red-backed Mouse. — Evotomys gapperi galei (Merriam). 

 Lighter in color than typical gapperi and with slightly 

 longer tail. Upperparts (winter) reddish chestnut, clearly 

 differentiated from buffy gray sides; feet and underparts 

 whitish to yellowish gray. Total length, 5.8 inches; tail 

 vertebrae, 1.8 inches; hind foot, .72 inch. Found in " Boreal 

 Zone of mountains of Colorado and northward along 

 eastern ranges of Rocky Mountains to northern Montana." 

 (Bailey) 



British Columbia Red-backed Mouse. — Evotomys gapperi 

 satiiratus Rhoads. 

 Resembling typical gapperi but larger, longer tailed and 

 with conspicuous areas over lateral glands of males. Upper- 

 parts bright reddish chestnut; sides dark gray; underparts 



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