Feb., 1912. Mammals of Illinois and Wisconsin — Cory. 195 



p. m. gracilis 



P. m. abietorum 



© 



P. .71. eremus 







P: m. argentatus 



O 



P. m. nubilerrae 



rea of intergrada'tion 



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. tnaniculatus and type localities of other geographical races of maniculatus , 

 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 (Hoy & 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. 



