MILLER AND REHX: NORTH AMERICAN MAMMALS. 119' 



Microtus montanus arizonensis Bcailey. 



ls9s. Mian it Ks montanus arizonensis Bailey, Proc. biol. soc. 



Washington, xii, p. 88. April 30, 1898. 

 Type locality. — Springerville, Apache County, Arizona. 



Microtus montanus rivularis (Bailey). 



1898. Microtus nevadensis rivularis Bailey, Proc. l)iol. soc. 



Washington, xii, p. 87. April 30, 1898. 

 1900. Microtus montanus rivularis Bailey, North Amer. 



fauna, no. 17. p. 29. June 6, 1900. 

 Type locality. — St. George, Washington County, Utah. 



Microtus nanus (Merriam). 



1891. Ari'icola (Jf/nomes) nanus Merriam, North Amer. 

 fauna, no. 5, p. 63. July 30, 1891. 



1897. Microtus nawis Miller, Proc. biol. soc. Washington, 

 XI, p. 67. April 21, 1897. 



Type locality. — Pahsimeroi Mountains, Idaho. Altitude, 

 9350 feet. 



Microtus nanus canescens Baile}-. 



1898. Mil-rot us u'///us canescens Bailey, Proc. biol. soc. 

 Washington, xii, p. 87. April 30, 1898. 



Type locality. — Conconully, Okanogan County, Washington. 



Microtus canicaudus ^filler. 



1^97. Microtus canicaudus Miller, Proc. biol. soc. Washing- 

 ton, XI, p. 67. April 21, 1897. 



Type locality. — McCoy. Willamette Valley, Polk County, 

 Oregon. 



Microtus dutcheri Bailey. 



1898. Microtus dutcheri Bailey, Proc. biol. soc. Washing- 

 ton. XII, J). 85. April 30, 1898. 



Type locality. — Big Cottonwood Meadows, near Mount 

 Whitney, Tulare County, California. Altitude, 10,000 feet. 



Microtus nevadensis Bailey. 



1898. Microtus nevadensis Bailey. Proc. biol. soc. 'Washing- 

 ton, XII, p. 86. April 30, 1898. 

 Type locality. — Ash Meadows, Xye County, Nevada. 



