MAMMALS 317 



M. minor (Meir.). Size very small; length 133 mm.; tail 36mm.; hind 

 foot 16 mm.; color peppery gray above, buff below: northern border of 

 the Great Plains from Minneapolis to eastern North Dakota and Alberta. 



M. californicus (Peale). Color dull buff or brownish; belly whitish; 

 length 171 mm.; tail 49 mm.; hind foot 21 mm.; mammae 8; fur coarse: 

 Pacific slope; in dry meadows. 



Subspecies of M. californicus 



M. c. californicus (Peale). California west of the Sierras, from 

 San Diego to southern Oregon. 



M. c. vallicola Bailey. Larger and darker : valleys east of the Sierras. 



M. c. constrictus Bailey. Smaller and grayer: coast region near 

 Cape Mendocino. 



M. edax (LeConte). Color dark gray; belly whitish; length 217 

 mm.; tail 72 mm.; hind foot 25 mm.; feet large and stout: bottom of the 

 San Joaquin and Sacramento Valleys; Lower Austral zone. 



M. toumsendi (Bachman). Color dark brown; belly grayish; tail 

 black; length 226 mm.; tail 66 mm.; hind foot 26 mm.; ears conspicuous: 

 region west of the Cascades from British Columbia to Yaquina Bay, 

 Oregon; Transition zone. 



M. mordax (Merr.). Color dark gray; belly whitish; tail long; 

 feet small; length 200 mm.; tail 77 mm.; hind foot 22 mm.: Rocky 

 Mountains from latitude 60 to New Mexico and the eastern slopes of 

 the Cascades and Sierras; common on the banks of mountain streams; 

 Hudsonian and Canadian zones. 



M. macrurus Merr. Color dark brownish gray; length 220 mm.; 

 tail 88 mm.; hind foot 24 mm.: Olympic Mountains to Alaska; along 

 cold streams. 



M. angusticeps Bailey. Color dark brownish gray, darkest on the 

 face; tail distinctly bicolor; length 170 mm.; tail 56 mm.; hind foot 22; 

 skull very narrow: coastal region of northwestern California and south- 

 ern Oregon. 



M. montanus (Peale). Color dark gray; belly whitish; length 175 

 mm.; tail 52 mm.; hind foot 21 mm.: eastern Oregon; northern Cali- 

 fornia to Nevada. 



Subspecies of M. montanus 



M. ?n. arizonensis Bailey. Color more ferrugineous : eastern Arizona ; 

 Transition zone. 



M. m. rivularis Bailey. Larger and lighter colored: Washington 

 County, Utah; Lower Sonoran zone. 



