416 BULLETIN 128, UNITED STATES NATIONAL MUSEUM. 



Microtus mordax abditus A. B. Howell. 



1923. Microtus mordax ahditus A. B. Howell, Journ. Mamm., 



vol. 4, p. 36. February 9, 1923. 

 Type Locality, — Walker's Ranch, Pleasant Valley, 8 miles 

 south of Tillamook, Tillamook County, Oregon. 



t*Microtus macrurus Merriam. 



1898. Microtus macrurus Merriam, Proc. Acad. Nat. Sci. Phila- 

 delphia, p. 353. October 4, 1898. 



Type Locality. — Lake Cushman, Olympic Mountains, Mason 

 County, Washington. 



Range. — The typical form: Olympic Mountains. With slight 

 variation along the coast strip of British Columbia and Alaska 

 north to Yakutat. 



Microtus coronarius Swarth. 



1911. Microtus coronarius Swarth, Univ. Calif. Publ. ZooL, vol. 



7, p. 131. January 12, 1911. 

 Type Locality. — Egg Harbor, Coronation Island, Alaska. 



t*Microtus angusticeps Bailey. 



1898. Microtus angusticeps Bailey, Proc. Biol. Soc. Washington, 

 vol. 12, p. 86. April 30, 1898. 



Type Locality. — Crescent City, Del Norte County, California. 



Range. — Coast region or northwestern California and south- 

 western Oregon. 



t*Microtus alticola alticola (Merriam). 



1890. Arvicola (Mynomes) alticolus Merriam, North. Amer. 

 Fauna No. 3, p. 67. September 11, 1890. 



1895. Microtus alticolus Allen, Bull. Amer. Mus. Nat. Hist., 

 vol. 7, p. 219. June 29, 1895. 



Type Locality. — Little Spring, San Francisco Mountain, Coco- 

 nino County, Arizona. Altitude, 8,200 feet. 



Range. — Boreal zone of San Francisco Moimtain, from 8,200 

 feet altitude up to timber line at 11,000 feet. 



*Microtus alticola leucophaeus (Allen). 



1894. Arvicola leucophseus Allen, Bull. Amer. Mus. Nat. Hist., 



vol. 6, p. 320. November 7, 1894. 

 1900. Microtus alticolus leucophseus Bailey, North Amer. 



Fauna, No. 17, p. 53. June 6, 1900. 

 Type Locality. — Graham Mountains, Graham County, Arizona. 

 Range. — Known only from the type locality. 



