304 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY- 
Genus AULACOMYS Rhoads. 
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1894. Aulacomys Rhoads, Amer. nat., xxviii, p. 182. February, 
1894. Type. — Aulacomys arvsicoloides Rhoads. 
Regarded by Miller (North Amer. fauna, no. 12, pp. 18, 66, July 
23, 1896) as identical with the subgenus Armcola (p. 124). 
Microtus principalis Rhoads. 
1895. Microtus principalis Rhoads, Amer. nat., xxix, p. 940. 
October, 1895. 
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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 riclmrdsoni armcoloides (p. 125). 
Microtus pumilus Elliot. 
1899. Microtus (^Layurus) pnmilus 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 PheyKicornys. 
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Microtus morosus Elliot. 
1899. Microtus morosus Elliot, Field Columbian mus., publi¬ 
cation 30, zool. ser., i, p. 227. February 1, 1899. 
Type locality. — Boulder Lake, Olympic Mountains, Clallam 
County, Washington. Altitude, about 5000 feet. 
Regarded by Bailey (North Amer. fauna, no. 17, p. 70, June 6, 
1900) as identical with M. oregoni (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^7 cooperi (p. 132). 
Geomys nelsoni Merriam. 
1892. Geoynys nelsoyii Merriam, Proc. biol. soc. Washington, 
VII, p. 164. September 29, 1892. 
