Feb., 1912. Mammals of Illinois and Wisconsin — Cory. 221 



Map illustrating approximate distribution of the Prairie Meadow Mouse (Microtus ochrogaster) 

 and allied forms belonging to the subgenus Pedomys. 



Microtus ochrogaster (Wagner). Type locality — Uncertain — "Mississippi Val- 

 ley." Description as previously given. 



Microtus 0. ludovicianus (Bailey). (N. Amer. Fauna, No. 17, 1900, p. 74.) 

 Type locality — Iowa, Calcasieu Parish, Louisiana. Very slightly different 

 from ochrogaster. It is supposed to differ in having audital bullae larger and 

 rostrum and nasals more slender. 



Microtus minor (Merriam). (Amer. Nat., XXII, 1888, p. 600.) Type locality^ 

 Bottineau, base of Turtle Mountains, North Dakota. Similar in coloration to 

 ochrogaster, but decidedly smaller, the skull smaller and narrower. Total length, 

 about 5.25 in. (133 mm.); tail vertebrae, 1.37 in. (35 mm.); hind foot, .63 in. 

 (16 mm.). Not as yet recorded from within our limits, but might be looked 

 for in northwestern Wisconsin. 



