MICROTUS. 239 



Geogr. Distr. Plateau County of eastern Arizona at head of the 

 Little Colorado River. 



b. Microtus montanus rivularis (Bailey). 



Microtus nevadensis rivularis Bailey, Biol. Soc. Wash., xii, 1898, 



p. 87. 

 Microtus montanus rivularis Elliot, Syn. N. Atn. Mamm., F. C. M. 

 Pub., II, 1901, p. 184. Zool. Ser. 

 Utah Meadow Vole. 



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

 Geogr. Distr. Known only from the type locality. 



569. Microtus nanus (Merriam). 



Arvicola nanus Merr., N. Am. Faun., No. 5, 1891, p. 62, pi. 11, 



figs. 5, 6. 

 Microtus nanus Elliot, Syn. N. Am. Mamm., F. C. M. Pub., 11, 

 1901, p. 184. Zool. Ser. 

 Dwarf Meadow Vole. 



Type locality. Pahsimeroi Mountains, Idaho. Altitude, 9,350 

 feet. 



Geogr. Distr. Rocky Mountains and other ranges from central 

 Idaho, southward to Central Nevada and southern Colorado. 



a. Microtus nanus canescens Bailey. 



Microtus nanus canescens Bailey, Proc. Biol. Soc. Wash., xii, 

 1898, p. 87. Elliot, Syn. N. Am. Mamm., F. C. M. Pub., 11, 

 1901, p. 185. Zool. Ser. 

 Gray Meadow Vole. 



Type locality. Conconully, Okanogan County, Washington. 

 Geogr. Distr. Northern Washington and southern British Colum- 

 bia, east of the Cascades. 



570. Microtus canicaudus Miller. 



Microtus canicaudus Miller, Proc. Biol. Soc. Wash., xi, '1897, 

 p. 67. Elliot, Syn. N. Am. Mamm., F. C. M. Pub., 11, 1901, 

 p. 185. Zool. Ser. 

 Gray-tailed Meadow Vole. 



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

 Geogr. Distr. Willamette Valley, Oregon, and southern Washing- * 

 ton, on eastern slopes of the Cascade Mountains. 



571. Microtus dutcheri Bailey. 



Microtus dutcheri Bailey, Proc. Biol. Soc. Wash., xii, 1898, p. 85. 

 Elliot, Syn. N. Am. Mamm., F. C. M. Pub., 11, 1901, p. 185. 

 Zool. Ser. 



