122 PROCEEDINGS : BOSTON SOCIETY NATURAL HISTORY. 



1885. Arvicola townsendi TRUE, Proc. U. S. nat. mus., vn 

 (1884), p. 597. 1885. (Part.) 



1896. M\_icrotus\ townsendi MILLER, North Amer. fauna, no. 

 12, p. 66. July 22, 1896. 



TYPE LOCALITY. Columbia River; according to Bailey 

 (North Amer. fauna, no. 17, p. 46, June 6, 1900), near mouth 

 of Willamette, on or near Wappatoo (or Sauvie) Island. 



Microtus tetramerus (Rhoads) . 



1894. Arvicola (Tetramerodon) tetramerus RHOADS, Proc. 

 acad. nat. sci. Phila., p. 283. October 23, 1894. 



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



17, p. 47. June 6, 1900. 

 TYPE LOCALITY. Beacon Hill Park, Victoria, Vancouver 



Island, British Columbia, Canada. 



Microtus longicaudus (Merriam). 



1888. Arvicola (Mynomes) longicaudus MERRIAM, Amer. 

 nat., xxn, p. 934. October, 1888. 



1895. Microtus (Mynomes) longicaudus ALLEN, Bull. Amer. 

 mus. nat. hist., vn, p. 266. August 21, 1895. 



TYPE LOCALITY. Custer, Black Hills, Custer County, South 

 Dakota. Altitude, 5500 feet. 



Microtus mordax (Merriam). 



1891. Arvicola (Mynomes) mordax MERRIAM, North Amer. 

 fauna, no. 5, p. 61. July 30, 1891. 



1897. \Microtus\ mordax TROUESSART, Catal. mamm., pt. in, 

 p. 564. 



TYPE LOCALITY. Sawtooth (or Alturas) Lake, east base of 

 Sawtooth Mountains, Idaho. Altitude, 7200 feet. 



Microtus macrurus Merriam. 



1898. Microtus macrurus MERRIAM, Proc. acad. nat. sci. 

 Phila., p. 353. October 4, 1898. 



TYPE LOCALITY. Lake Cushman, Olympic Mountains, Wash- 

 ington . 



Microtus angusticeps Bailey. 



1898. Microtus angusticeps BAILEY, Proc. biol. soc. Wash- 

 ington, xii, p. 86. April 30, 1898. 



TYPE LOCALITY. Crescent City, Del Norte County, Califor- 

 nia. 



