120 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 



Microtus californicus (Peale) . 



1848. Arvicola californica PEALE, U. -S. explor. exp., vm, 

 mamm. and ornith., p. 46. 



1897. [Microtus'] californicus TROUESSART, Catal. mamm., 

 pt. in, p. 563. 



TYPE LOCALITY. Vicinity of San Francisco Bay, California. 



Microtus californicus vallicola Bailey. 



1898. Microtus californicus vallicola BAILEY, Proc. biol. soc. 

 Washington, xn, p. 89. April 30, 1898. 



TYPE LOCALITY. Lone Pine, Inyo County, California. 



Microtus californicus constrictus Bailey. 



1900. Microtus californicus constrictus BAILEY, North Amer. 



fauna, no. 17, p. 36. June 6, 1900. 



TYPE LOCALITY. Cape Mendocino, Humboldt County, Cali- 

 fornia. 



Microtus edax (Le Conte). 



1853. Aroicola edax LE CONTE, Proc. acad. nat. sci. Phila., 

 vi, p. 405. 



1896. Microtus edax ALLEN, Bull. Amer. mus. nat. hist., vm, 

 p. 268. December 4, 1896. 



TYPE LOCALITY. California, south of San Francisco. 



Microtus scirpensis Bailey. 



1900. Microtus scirpensis BAILEY, North Amer. fauna, no. 



17, p. 38. June 6, 1900. 

 TYPE LOCALITY. Amargosa River, near Nevada line, Inyo 



County, California. 



Microtus operarius (Nelson). 



1893. Arvicola operarius NELSON, Proc. biol. soc. Washing- 

 ton, vm, p. 139, December 28, 1893. 



1897. \Microtus\ operarius TROUESSART, Catal. mamm., pt. 

 in, p. 564. 



TYPE LOCALITY. St. Michaels, Norton Sound, Alaska. 



Microtus macfarlani Merriam. 



1900. Microtus macfarlani MERRIAM, Proc. Washington 

 acad. sci., n, p. 24. March 14, 1900. 



TYPE LOCALITY. Fort Anderson, Anderson River, Macken- 

 zie, Canada. 



