590 U. S. NATIONAL MUSEUM BULLETIN 205 



(Vogelsang Lake, Yosemite National Park) ; zonal range, Transition to Hud- 

 sonian (Grinnell, Univ. California Publ. Zool., vol. 40, No. 2, p. 186, Sept. 26, 

 1933) ; recorded also at 12,000 feet at McAfee Meadow and at 10,400 feet at 

 Big Prospector Meadow, both in White Mountains, Mono County, Calif.; and 

 west-central Nevada from Pyramid Lake south to Mount Grant and eastward 

 along Truckee Canal at least to eastern border of Lyon County (Hall, Mammals 

 of Nevada, p. 546, July 1, 1946) . 



Microtus montanus canicaudus Millerf * 



1897. Microtus canicaudus Miller, Proc. Biol. Soc. Washington, vol. 11, p. 67, 

 Apr. 21, 1897. 



1951. Microtus montanus canicaudus Hall and Kelson, Univ. Kansas. Publ. 



Mus. Nat. Hist., vol. 5, No. 7, p. 77, Oct. 1, 1951. 

 Type Locality. — McCoy, Willamette Valley, Polk County, Oreg. Range. — 

 Willamette Valley eastward at least to Hood River and Wapinitia, Oreg. 



Microtus montanus canescens V. Bailey f* 



1898. Microtus nanus canescens V. Bailey, Proc. Biol. Soc. Washington, vol. 

 12, p. 87, Apr. 30, 1898. 



1938. Microtus montanus canescens Hall, Proc. Biol. Soc. Washington, vol. 51, 

 p. 133, Aug. 23, 1938. 



Type Locality. — Conconully, Okanogan County, Wash. Range. — Lower levels 

 in dry belt of southern British Columbia east of Cascade Mountains (Okanogan 

 and Osoyoos in Okanogan Valley, and Midway and Myers Creek in Kettle River 

 Valley), Canada (Anderson, Nat. Mus. Canada Bull. 102 (1946), p. 157, Jan. 24, 

 1947) ; and southward in eastern foothills of Cascade Mountains from British 

 Columbia boundary, probably to Columbia River; recorded east to Benton City, 

 Wash. (Dalquest, Univ. Kansas Publ. Mus. Nat. Hist., vol. 2, p. 349, Apr. 9, 1948) . 



Microtus montanus nanus (Merriam)f* 



1891. Arvicola (Mynomes) nanus Merriam, North Amer. Fauna No. 5, p. 63, 

 July 30, 1891. 



1938. Microtus montanus nanus Hall, Proc. Biol. Soc. Washington, vol. 51, 

 p. 133, Aug. 23, 1938. 



Type Locality. — Pahsimeroi Mountains, head of Pahsimeroi River, Custer 

 County, Idaho. Altitude, 9,350 feet. Range. — From Clearwater drainage basin 

 in central Idaho (Davis, The Recent mammals of Idaho, p. 316, Apr. 5, 1939) 

 westward as far as 5 miles east of Wallula in southeastern Washington (Dalquest, 

 Univ. Kansas Publ. Mus. Nat. Hist., vol. 2, p. 348, Apr. 9, 1948) and to Hay 

 Creek on ridge between John Day and Deschutes Rivers in Blue Mountain section 

 of northeastern Oregon (V. Bailey, North Amer. Fauna No. 55 (June), p. 204, 

 Aug. 29, 1936) ; southward to northeastern corner of Nevada (Hall, Mammals of 

 Nevada, p. 545, July 1, 1946), northern Utah, including Wasatch and Uinta 

 Mountains (Hall, Univ. California Publ. Zool., vol. 37, No. 1, p. 6, Apr. 10, 1931; 

 Kelson, Univ. Utah. Biol. Ser., vol. 11, No. 3, p. 96, Feb. 15, 1951), and Rocky 

 Mountains from Montana southward into Wyoming. 



Microtus montanus pratincolus Hall and Kelson* 



1951. Microtus montanus pratincolus Hall and Kelson, Univ. Kansas Publ. 

 Mus. Nat. Hist., vol. 5, No. 7, p. 75, Oct. 1, 1951. 



