MILLER AND REHN: NORTH AMERICAN MAMMALS. 119’ 
Microtus montanus arizonensis Bailev. 
1898. Jlicrotus 7710 ntanus arizonensis Bailey, Proc. biol. soc. 
Washington, xii, p. 88. April 30, 1898. 
Type locality. — Springerville, Apache County, Arizona. 
Microtus montanus rivularis (Bailey). 
1898. Jlicrotas 7ierade7isis rirularis Bailey, Proc. biol. soc. 
Washington, xii, p. 87. April 30, 1898. 
1900. 3Iicrotus r7i07ita)ius rivularis Bailey, North Amer. 
fauna, no. 17, p. 29. June 6, 1900. 
Type locality. — St. George, W'ashington County, Utah. 
Microtus nanus (Merriam). 
1891. Arvicola {3I)j7i07nes') 7ia7ius Merriam, North Amer. 
fauna, no. 5, p. 63. July 30, 1891. 
1897. 3Iierotus 7ianus Miller, Proc. biol. soc. Washington, 
XI, p. 67. April 21, 1897. 
Type locality. — Pahsimeroi Mountains, Idaho. Altitude, 
9350 feet. 
Microtus nanus canescens Bailey. 
1898. 3Iic7 •otus 7ia7ius canesce/is Bailey, Proc. biol. soc. 
Washington, xii, p. 87. April 30, 1898. 
Type locality.— Conconully, Okanogan County, Washington. 
Microtus canicaudus Miller. 
1897. Jlicrotus ca7iicaudus Miller, Proc. biol. soc. Washing¬ 
ton, XI, p. 67. April 21, 1897. 
Type LOCALITY.— McCoy, Willamette Valley, Polk County, 
Ore 0 : 011 . 
Microtus dutcheri Bailey. 
1898. Jlicrotus dutcheri Bailey, Proc. biol. soc. Washing¬ 
ton, XII, p. 85. April 30, 1898. 
Type locality. — Big Cottonwood Meadows, near Mount 
Whitney, Tulare County, California. Altitude, 10,000 feet. 
Microtus nevadensis Bailey. 
t/ 
1898. Jlicrotus 7ievadensis Bailey, Proc. biol. soc. Washing¬ 
ton, XII, p. 86. April 30, 1898. 
Type locality. — Ash Meadows, Nye County, Neyada. 
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