212 FIELD MUSEUM OF NATURAL HISTORY ZOOLOGY, VOL. XL 



Map illustrating approximate distribution of Red-backed Mice or Red-backed Voles (.Evotomys) 

 in eastern United States. 



Evotomys gapperi (VIGORS). Type locality Vicinity of Lake Simcoe, Ontario. 

 Description as previously given. 



Evotomys g. loringi BAILEY. (Proc. Biol. Soc. Wash., XI, 1897, p. 125.) Type 

 locality Portland, Traill County, North Dakota. Smaller and somewhat 

 brighter colored than gapperi and with smaller skull. 



Evotomys g. ochraceus MILLER. (Proc. Bost. Soc. Nat. Hist., XXVI, 1894, p. 193.) 

 Type locality Mt. Washington, Coos Co., New Hampshire. Larger and 

 darker than gapperi. 



Evotomys g. rhoadsi STONE. (Amer. Nat., XXVII, 1893, p. 55.) Type locality 

 May's Landing, Atlantic Co., New Jersey. About the size of gapperi, but darker 

 and with shorter tail. 



Evotomys proteus BAILEY. (Proc. Biol. Soc. Wash., XI, 1897, p. 137.) Type 

 . locality Hamilton Inlet, Labrador. Largest of our northeastern forms. 



Evotomys carolinensis MERRIAM. (Amer. Jour. Sci., 3rd ser., XXXVI, 1888, p. 460.) 

 Type locality Roan Mountain, Mitchell Co., North Carolina (altitude 6,000 

 ft.). Dorsal stripe dark chestnut and not sharply defined, shading into color 

 of sides. 



