304 PROCEEDINGS : BOSTON SOCIETY NATURAL HISTORY 



Genus AULACOMYS Rhoads. 



1894. Atdacomys Rhoads, Amer. nat., xxviii, p. 182. February, 

 1894. Type. — Aulacomys arvicoloides Rhoads. 



Regarded by Miller (North Amer. fauna, no. 12, pp. 18, 66, July 

 23, 1896) as identical with the subgenus Arvicola (p. 124). 



Microtus principalis Rhoads. 



1895. Miiyrotus principalis Rhoads, Amer. nat., xxix, p. 940, 



October, 1895. 

 Type locality. — Mount Baker Range, British Columbia, 

 Canada. Altitude, 6000 feet. 

 Regarded by Bailey (North Amer. fauna, no. 17, p. 62, June 6, 

 1900) as identical with Microtus richardsoni arvicoloides (p. 125). 



Microtus pumilus Elliot. 



1899. Microtus (^Layurtis) p>u'mili(s Elliot, Field Columbian 



mus., publication 30, zool. ser., i, p. 226. February 1, 1899, 



Type locality. — Happy Lake, Olympic Mountains, Clallam 



County, Washington. Altitude, about 5000 feet. 



Regarded by Bailey (North Amer. fauna, no. 17, p, 68, June 6, 



1900) as an immature Phenacomys. 



Microtus morosus Elliot. 



1899. Microtus tnorosus Elliot, Field Columbian mus., publi- 

 cation 30, zool. ser., i, p. 227. Februaiy 1, 1899. 

 Type locality. — Boulder Lake, Olympic Mountains, Clallam 

 County, "Washington, Altitude, about. 5000 feet. 

 Regarded by I?ailey (North Amer. fauna, no, 17, p. 70, June 6, 

 1900) as identical with M. oreyoni (p. 127). 



Synaptomys stonei Rhoads. 



1893. Synaptomys stonei Rhoads, Amer, nat., xxvii, p. 53. 



January, 1893. 

 Type locality. — Mays Landing, Atlantic County, New Jersey. 

 Regarded by Merriam (Proc, biol, soc. Washington, x, p, 58, 

 March 19, 1896) as identical with 8. cooperi (p. 132). 



Geomys nelsoni Merriam. 



1892. Geomys nelsoni Merriam, Proc, biol. soc. Washington, 

 VII, p. 164. September 29, 1892. 



