580 U. S. NATIONAL MUSEUM BULLETIN 205 



(Bearberry Creek west of Olds) , and northeastern British Columbia (Peace 

 River) ; south to Red Deer River in central Alberta and Athabaska Lake in 

 northwestern Saskatchewan; and east to Churchill, Manitoba (Anderson, Nat. 

 Mus. Canada Bull. 102 (1946) , p. 151, Jan. 24, 1947) . 



albipes — group 

 Phenacomys albipes Merriamf * 



1901. Phenacomys albipes Merriam, Proc. Biol. Soc. Washington, vol. 14, 



p. 125, July 19, 1901. 

 Type Locality. — Redwoods, near Areata, Humboldt Bay, Humboldt County, 

 Calif. Range. — Occurs in a coastal strip of unknown width from Areata, Hum- 

 boldt County, Calif., north to vicinity of Columbia River probably, and east as 

 far as Vida, Oreg. 



longicaudus — group 



Phenacomys longicaudus Truef* 



1890. Phenacomys longicaudus True, Proc. U. S. Nat. Mus., vol. 13, p. 303, 

 Nov. 15, 1890. 



Type Locality. — Marshfield, Coos County, Oreg. Range, — From vicinity 

 of Monte Rio and Camp Meeker in Sonoma County, and interiorly to Bridge- 

 ville, Humboldt County, and South Fork Mountain, Trinity County, in north- 

 western California (Grinnell, Univ. California Publ. Zool., vol. 40, No. 2, p. 

 184, Sept. 26, 1933) northward through timbered portions of western Oregon 

 to Columbia River (V. Bailey, North Amer. Fauna No. 55 (June), p. 194, Aug. 

 29,1936). 



Phenacomys silvicola A. B. Howell* 



1921. Plienacomys silvicolus A. B. Howell, Journ. Maram., vol. 2, No. 2, 

 p. 98, May 2, 1921. 



Type Locality. — Five miles southeast of Tillamook, Tillamook County, Oreg. 

 Range. — Known only from type locality, and from Corvallis, Oreg. ; undoubtedly 

 confined to forested area of humid coast belt. 



Genus ORTHRIOMYS 35 Merriam 

 1898. Orthriomys Merriam, Proc. Biol. Soc. Washington, vol. 12, p. 106, 

 Apr. 30, 1898. (Type, Microtus umbrosus Merriam.) 



Orthriomys umbrosus (Merriam) f* 



1898. Microtus umbrosus Merriam, Proc. Biol. Soc. Washington, vol. 12, p. 



107, Apr. 30, 1898. 

 1941. Orthriomys umbrosus Ellerman, The families and genera of living 



rodents, vol. 2, p. 585, Mar. 21, 1941. 

 Type Locality. — Mount Zempoaltepec, Oaxaca, Mexico. Altitude, 8,200 feet. 

 Range. — Known only from east slope of Mount Zempoaltepec. Zonal range, 

 humid Upper Austral. 



36 Regarded as a valid genus by Ellerman. The families and genera of living rodents, 

 vol. 2, p. 585, Mar. 21, 1941. 



