190 Fretp Museum or Naturat History — Zoétoey, Vor. XI. 
Peromyscus maniculatus bairdi (Hoy & KEnnicort). 
PRAIRIE WHITE-FOOTED Movuse. 
PRAIRIE DEER Mouse. Bairp’s DEER Mouse. MicuicaNn DEER 
MovseE. 
Mus bairdii Hoy & KENnicoTtT, in Kennicott, Agr. Rept. for 1856, U. S. Patent 
Office Rept., 1857, p. 92. 
Peromyscus bairdi SNYDER, Bull. Wis. Nat. Hist. Soc., II, 1902, p. 116 (Wisconsin). 
Ho.uister, Bull. Wis. Nat. Hist. Soc., VI, 1908, p. 40 (Wisconsin). 
Peromyscus michiganensis JACKSON, Proc. Biol. Soc. Wash., XX, 1907, p. 72 (Mis- 
souri). Jb., Bull. Wis. Nat. Hist. Soc., VI, 1908, p. 21 (Wisconsin). Haun, 
Proc. U. S. Nat. Mus., XXXII, 1907, p. 459 (Indiana). 
Peromyscus maniculatus bairdi Haun, Ann. Rept. Dept. Geol. & Nat. Resources 
Ind., 1908 (1909), p. 502 (Indiana). Oscoop, N. Amer. Fauna, No. 28, 1909, 
p. 79 (Illinois, Indiana, Iowa, Michigan, Minnesota, Missouri, Wisconsin, etc.). 
Howe tt, Proc. Biol. Soc. Wash., XXIII, 1910, p. 26 (Illinois, Missouri). 
Woop, Bull. Ill. State Lab. Nat. Hist., VIII, 1910, p. 544 (Illinois). 
Type locality — Bloomington, McLean Co., Illinois. 
Distribution — Prairie region of the upper Mississippi Valley in Wis- 
consin, Illinois, Indiana, Minnesota, eastern Ohio, Iowa, Missouri, 
Oklahoma, and eastern portions of Nebraska, Kansas, South 
Dakota, and North Dakota; north to southern Manitoba. 
Special characters —Resembles P. 1. noveboracensis but somewhat 
smaller, tail shorter, and general color slightly darker (less brownish). 
Description — Upper parts brown, the middle of the back dark brown, 
much darker than the sides; under parts white or whitish, the bases 
of the hairs slaty gray, the tips white. When the hair is short 
and worn, the dark bases are not entirely concealed, giving a gray- 
ish appearance to the under parts. Upper surface of tail dark; 
under surface pale. 
Measurements — Total length, 5.50 to 6.50 in. (140 to 165 mm.); tail 
vertebra, 2.25 to 2.75 in. (57 to 69.5 mm.); hind foot, .7o to .75 
in. (18 to 19 mm.). 
The Prairie White-footed Mouse is abundant in suitable localities 
in the greater portion of Illinois and Wisconsin, and, as its name implies, 
it inhabits dry, cultivated fields and prairies, but it also is found in 
open woods where the growth is small and scattered. Regarding its 
habits, I cannot do better than to quote Robert Kennicott who had 
unusual opportunities for observing it. He says, ‘Not having, on the 
prairies, the shelter found by its timber-loving cousins, in old stumps 
and trees, this species digs burrows. These are rather simple, with 
few or no side-passages, and often with but one entrance, the depth 
and extent being variable, but never great. The nest is small, com- 
