FEB., 1912. MAMMALS OF ILLINOIS AND WISCONSIN CORY. 195 



Map illustrating approximate range of the Prairie White-footed Mouse (P. m. bairdi) and the 

 Canadian White-footed Mouse (P. m. gracilis) , which occur within our limits, together with the south- 

 ern portion of the range of P. maniculatus and type localities of other geographical races of manicidatus, 

 which occur in eastern United States and Canada. 



Peromyscus maniculatus (WAGNER). (Wieg. Arch. f. Naturg., XI, I, 1845, p. 148.) 

 Type locality Labrador. Upper parts brown, the middle of the back decidedly 

 darker than the sides; under parts white or grayish white (the hairs plumbeous 

 gray at bases with white tips); tail bicolor and pencillate (blackish above, 

 whitish below). Total length, 7 to 7.75 in. (178 to 197 mm.); tail vertebrae, 

 3 to 3.75 in. (76 to 95 mm.); hind foot, .75 to .87 in. (19 to 22.5 mm.). 



Peromyscus m. gracilis (LECoNTE). Type locality Michigan. Similar to man- 

 iculatus but tail longer (3.75 to 4 inches), hind foot smaller and skull smaller 

 and narrower; characters and measurements given on page 194. 



Peromyscus m. bairdi (Hov & KENNICOTT). Type locality Bloomington, McLean 

 County, Illinois. Somewhat darker, tail shorter (less than 2.75 in.); for 

 description and measurements see page 190. 



Peromyscus m. abietorum (BANGS). (Proc. Biol. Soc. Wash., X, 1896, p. 49.) Type 

 locality James River, Nova Scotia. Similar to gracilis, but paler and some- 

 what grayer. 



