120 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 



Microtus californicus (Peale). 



1848. Arviaola californica Peale, U. S. explor. exp., viii, 

 mamm. and ornitL., p. 40. 



1897. \_Microtiis\ caUj'ornirus Tkoukssart, Catal. mamm., 

 pt. Ill, p. 563. 



Type LOCALITY. — Vicinity of Sau Francisco Bay, California. 



Microtus californicus vallicola Bailey. 



1898. Jlicrotus californicus vallicola Bailey, Proc. biol. soc. 

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



Type locality. — Lone Pine, Inyo County, California. 



Microtus californicus constrictus Bailey. 



1900. Microtas califorjiicas co/istrict>/f< Bailey, Xorth Amer. 

 fauna, no. 17, p. 30. June 0, 1900. 



Ta'pe LOCALITY. — Cape Mendocino, Humboldt County, Cali- 

 fornia. 



Microtus edax (Le Conte). 



1853. Aroicola edax Le Coxte, Proc. acad. nat. sci. Phila., 

 VI, p. 405. 



1896. Microtus edax Allex, Bull. Amer. nius. nat. hist., viii, 

 p. 268. December 4, 1890. 



Type locality. — California, south of 8an Francisco. 



Microtus scirpensis Bailey. 



1900. Microtus scirpensis Bailey. Xorth Amer. fauna, no. 



17, p. 38. June 6, 1900. 

 Type hocality. — Aniargosa Riyer, near Xeyada line, Inyo 

 Connty, California. 



Microtus operarius (X'elson). 



1893. Arvicola oprtrarius Xelsox, Proc. biol. soc. Washing- 

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



1897. '[JSIicrotas^^ operarius Tkoitessart, Catal. mamm., pt. 

 Ill, p. 504. 



Ty'PE locality. — St. 'Michaels, Xorton Sound, Alaska. 



Microtus macfarlani Merriani. 



1900^. Jlicrotus macfarlani Meeriam, Proc. Washington 

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



Type locality. — Fort Anderson, Anderson River, Macken- 

 zie, Canada. 



