FIELD BOOK OF MAMMALS 



dull bister sprinkled with black; sides grayer; feet dark 

 gray; tail faintly bicolor, blackish and soiled whitish; 

 underparts dull buffy gray. Winter pelage grayer above, 

 tail more distinctly bicolor. Total length, 7.4 inches; 

 tail vertebras, 2.6 inches; hind foot, .84 inch. Found in 

 higher parts of the Black Hills, South Dakota, and down 

 the valleys of some of the cold streams into the Transition 

 Zone. 



Cantankerous Meadow Mouse. — Microtus mordax mordax 

 (Merriam). 

 Resembling longicaudus; no conspicuous hip glands in 

 males. Upperparts (summer) grayish bister; sides grayer; 

 nose dusky; feet dark gray; tail faintly bicolor, dusky and 

 soiled whitish; underparts whitish. Winter pelage lighter 

 colored, more contrast between dorsal region and sides; 

 underparts whiter; tail sharply bicolor; feet whitish. Total 

 length, 7.4 inches; tail vertebrae, 2.8 inches; hind foot, .88 

 inch. Found in "Rocky Mountains and outlying ranges 

 from latitude 60° to northern New Mexico, and south in 

 the Cascades and Sierra Nevada as far as Kaweah and 

 Kern rivers, California. In the Cascades mainly confined 

 to the east slope, but extending west tothe Siskiyous, in 

 southern Oregon, and Salmon and Trinity mountains, in 

 northern California. Found in most of the isolated 

 ranges of eastern Oregon and northern and central Nevada. 

 Common in Canadian and Hudsonian Zones." (Bailey) 



Sierra Nevada Meadow Mouse. — Microtus mordax sierrce R. 

 Kellogg. 

 Resembling typical mordax but color of upperparts and 

 sides slightly darker. "Upperparts mixed cinnamon-buff 

 to tawny olive and brownish black to black; rump and 

 sides grayer; underparts pale gray. Total length, 7.8 

 inches; tail vertebra, 2.7 inches; hind foot, .88 inch. Found 

 in eastern and northern California and adjoining parts of 

 Oregon, in Sierra Nevada, White, and Trinity Mountains. 



San Bernardino Meadow Mouse. — Microtus mordax hernar- 

 dinus Merriam. 

 Very much like typical mordax in size and color but differ- 

 ing in skull characters. Total length, 7.3 inches; tail 

 vertebrse, 2.5 inches; hind foot, .88 inch. Found in the 

 San Bernardino Mountains of southern Cahfomia from 

 7500-9050 feet above sea-level. 



Tillamook Meadow Mouse. — Microtus mordax abditus A. B. 

 Howell. 

 A very large, dark subspecies of mordax. Most nearly 

 like macrurus but darker and with longer foot and tail. 

 Total length, 8.8 inches; tail vertebr^E, 3.7 inches; hind 

 foot, 1. 14 inches. Found "along the humid coast strip 

 from the mouth of the Columbia River to southern Oregon; 

 or possibly into extreme northern California." (Howell) 



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