NORTH AMERICAN LAND MAMMALS. 227 



Subgenua Chilotus Baird. 



1857. Chilotus Baird, Mamm. N. Amer., p. 516. Type, Arvicola 

 oregoni Bachman. 



*Microtus oregoni oregoni (Bachman). 



1839. Arvicola oregoni Bachman, Joiirn. Acad. Nat. Sci. 



Philadelphia, vol. 8, pt. 1, p. 60. 

 1885. Arvicola oregonus True, Proc. U. S. Nat. Mus., vol. 7, 



(1884), p. 597. 1885. 



1896. Microtus oregoni Miller, North Amer. Fauna, No. 12, 

 p. 9. July 23, 1896. 



1899. Microtus morosus Elliot, Field Coliimb. Mus., piibl. 



30, zool. ser., vol. 1, p. 227. February 1, 1899. (Boulder 



Lake, Olympic Mountains, Clallam County, Washington. 



Altitude, about 5,000 feet.) 

 Type Locality. — Astoria, Clatsop County, Oregon. 

 Range. — Pacific coast region from northern California to Puget 



Sound. 



t*Microtus oregoni adocetus Merriam. 



1908. Microtus oregoni adocetus Merriam, Proc. Biol. Soc. 



Washington, vol. 21, p. 145. June 9, 1908. 

 Type Locality. — South Yolla Bolly Mountain, western Tehama 

 County, California. 



t*Microtus serpens Merriam. 



1897. Microtus serpens Merriam, Froc. Biol. Soc. Washmg- 

 ton, vol. 11, p. 75. April 21, 1897. 



Type Locality. — Agassiz, British Columbia, Canada. 



Range. — Low country of southern British Columbia and north- 

 ern Washington between the Cascade Mountains and Puget 

 Sound. 



t* Microtus bairdi Merriam. 



1897. Microtus bairdi Merriam, Proc. Biol. Soc. Washmgton, 



vol. 11, p. 74. April 21, 1897. 

 Type Locality. — Glacier Peak, Crater Lake, Klamath County, 



Oregon. Altitude, 7,800 feet. 

 Range. — Known only from the type locality, but probably 



restricted to the Iludsonian zone of the higher Cascades. 



Genus LAGURUS Gloger.^ 



1841. Lagurus Gloger, Gemeinn. Hand- u. Hilfsbuch d. 

 Naturgesch., vol. 1, !>. 97. Tyi>'S Lagurus migratorius Gloger 

 =Mus lagurus Pallas. 



» Revised by Bailey, North Amer. Fauna, No. 17, pp. 67-70, Juno 6, 1900. 



