Fes., 1912. MamMats oF ILLiInoris anD WIsconsIN— Cory. 195 
OKLA. Pa P. m-. gracilis 
ries | 
m. bairds 
P. Oe 
TREX. 
P: im, argentatus 
P. m. nubiterrae 
eee 
of intergradation 
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 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 vertebre, 
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. 
