124 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 



1896. M[icrotus] mogollonensis MILLER, Proc. biol. soc. 



Washington, xi, p. 68. April "21, 1896. 

 TYPE LOCALITY. Bakers Butte, Mogollon Mountains, Yava- 



pai County, Arizona. 



* Microtus xanthognathus (Leach). 



1815. Arvicola xanthognatha LEACH, Zool. niiscell., i, p. 60. 

 1885. Arvicola xanthognathus TRUE, Proc. U. S. nat. mus., 



vii (1884), p. 597. 1885. 

 1896. M\icrotus\ xanthognathus MILLER, North Amer. fauna, 



no. 12, p. 66. July 23, 1896. 

 TYPE LOCALITY. Hudson Bay. 



Microtus chrotorrhinus (Miller) . 



1894. Arvicola chrotorrhinus MILLER, Proc. Boston soc. nat. 

 hist., xxvi, p. 190. March 24, 1894. 



1896.' Microtus chrotorrhinus BANGS, Proc. biol. soc. Wash- 

 ington, x, p. 49. March 9, 1896. 



TYPE LOCALITY. Head of Tuckerman's Ravine, Mount Wash- 

 ington, Coos County, New Hampshire. Altitude, 5300 feet. 



Microtus chrotorrhinus ravus Bangs. 



1898. Microtus chrotorrhinus ravus BANGS, Proc. biol. soc. 



Washington, xn, p. 188. November 16, 1898. 

 TYPE LOCALITY. Black Kay, Strait of Belle Isle, Labrador. 



Subgenus ARVICOLA Lacepede. 



1799. Arvicola LACEPEDE, Tableau des divisions, sous-divisions, 

 ordres et genres des mammiferes, p. 10 (Published as supplement 

 to Discours d'ouverture et de cloture du cours d'histoire naturelle, 

 et tableaux methodiques des mammiferes et des oiseaux). Type. 

 Arvicola amphibius LACEPEDE = Mus terrestris LINNAEUS. 



Microtus richardsoni (DeKay). 



1842. Arvicola richardsoni DEKAY, Zt>ol. New York, mamm., 



p. 91. 

 1894. Aulacomys richardsoni RHOADS, Proc. acad. nat. sci. 



Phila., p. 288. October 23, 1894. 

 1897. [Microtus'] richardsoni TROUESSART, Catal. mamm., 



pt. in, p. 565. 



