124 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
1896. M[^icrotus'] mogollonemU Miller, Proc. biol. soc. 
lYashington, xi, p. 68. April 21, 1896. 
Type locality. — Bakers Butte, 31ogolloii Mountains, Yava¬ 
pai County, Arizona. 
"^Microtus xanthognathus (Leach). 
1815. Arvicola xanthognatha Leach, Zool. miscell., i, p. 60. 
1885. Arvicola xanthognathus Tree, Proc. U. S. nat. inns., 
VII (1884), p. 597. 1885. 
1896. M[icrotus'] xanthognathus Miller, Yorth 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, ji. 190. March 24, 1894. 
1896. Microtus chrotorrhinus Vyog. biol. soc. Wash¬ 
ington, X, p. 49. March 9, 1896. 
Type loCxVlity. — Head of Tuckerman’s Bavine, Mount Wash¬ 
ington, Coos County, Yew Hampshire. Altitude, 5300 feet. 
Microtus chrotorrhinus ravus Bangs. 
1898. Microtus chrotorrhinus ravus Bangs, Proc. biol. soc. 
AYashington, xii, p. 188. Yovember 16, 1898. 
Type locality.— Black Bay, Strait of Belle Isle, Labrador. 
Subgenus Arvicola Lacep^de. 
1799. Arvicola Lacepede, Tableau des divisions, sous-divisions, 
ordres et genres des mammif^res, p. 10 (Published as supplement 
to Discours d’ouverture et de cloture du cours d’histoire naturelle, 
et tableaux methodiques des mammif^res et des oiseaux). Type.— 
Arvicola aynphihius Lacepede = Mus temestris Linnaeus. 
Microtus richardsoni (DeKay). 
1842. Arvicola richardsoni DeKay’^, Zool. Yew York, mamm., 
p. 91. 
1894. Aulacoyyygs richardsoni Rhoads, Proc. acad. nat. sci. 
Phila., p. 288. October 23, 1894. 
1897. 'i^ficrotus'] richardsoni Trouessart, Catal. mamm., 
pt. Ill, p. 565. 
