122 PROCEEDINGS : BOSTON SOCIETY NATURAL HISTORY. 



1885. Arvicola fow/tsendi True, Proc. U. S.. uat. mus., vii 

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



1896. Ml^icrofus] townsendi Miller, North Amer. fauna, no. 

 12, p. 66. July 22, 1896. 



Type locality. — Columbia River; according to Bailey 

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

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



Microtus tetramerus (Rhoads) . 



1894. Arvtcola {Tetramerodon) tetramerus Rhoads, Proc. 

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



1900. Microtus tetramerus Bailey, Xorth 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 (Mi//<omes) longicaudus Merriam, Amer. 

 nat., XXII, p. 934. October, 1888. 



1895. Jlicrofus (Mi/Nomes) longicaudus Ai.j.^'s, Bull. Amer. 

 raus. nat. hist., vii, p. 266. August 21, 1895. 



Type locality. — Custer, Black Hills, Custer County, South 

 Dakota. Altitude, 5500 feet. 



Microtus niordax (Merriam). 



1891. Arvicola (3Ignornes) morda.v Merriam, North Amer. 

 fauna, no. 5, p. 61. Julj^ 30, 1891. 



1897. [Jlicrotus] mordax Trouessart, Catal. mamm., pt. iii, 

 p. 564. 



Ty'pe 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. — LakeCushman, Ohmipic Mountains, Wash- 

 ington . 



Microtus angusticeps Bailey. 



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

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

 Type locality. — Crescent Citv, Del Xorte County, Califor- 

 nia. 



