120 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
Microtus californicus (Peale). 
1848. Arvicola californica Peale, U. S. explor, exp., yiii, 
mamiii. and ornitb., p. 46. 
1897. [3Iicrotus] californicus Thouessaet, Catal. mamm., 
pt. Ill, p, 563. 
Type LOCALiTAL — Vicinity of San Francisco Bay, California. 
Microtus californicus vallicola BailcA . 
t.' 
1898. 3Iicrotm califoniicas vallicola Bailey, Proc. biol. soc. 
Washington, xii, p. 89. April 30, 1898. 
Type localital — Lone Pine, Inyo County, California. 
Microtus californicus constrictus Bailey. 
1900. Microtus californicus constrictus Bailey, Xorth Ainer. 
fauna, no. 17, p. 36. June 6, 1900. 
Ty"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. Alicrotiis edax Allen, Bull. Amer. inus. nat. hist., viii, 
p. 268. December 4, 1896. 
Ta^pe localital— California, south of San Francisco. 
Microtus scirpensis Bailey. 
1900. Microtus scirpensis Bailea", North Amer. fauna, no. 
17, p. 38. J^ne 6, 1900. 
Ta"pe locality. — Amargosa River, near Nevada line, Inyo 
County, California. 
Microtus operarius (Nelson). 
1893. Arvicola operarius Nelson, Proc. biol. soc. Washing¬ 
ton, VIII, p. 139. December 28, 1893. 
1897. \^3ficropus'] operarius Teouessaet, Catal. mamm., pt. 
Ill, p. 564. 
Ta^pe localital — St. Michaels, Norton Sound, Alaska. 
Microtus macfarlani Merriam. 
1900. 3Iicrotus macfarlani Meeeiam, Proc. Washington 
acad. sci., ii, p. 24. March 14, 1900. 
Ta^pe locality^.— Fort Anderson, Anderson River, Macken¬ 
zie, Canada. 
