184 Fretp Museum oF NaturaL History — Zoéxocy, Vor. XI. 
GROUP 2. Species which occur in southern Illinois. 
SECTION 1. General color of upper parts brown but not golden brown. 
Total length usually more than 7 inches; tail vertebrae more than 3 inches. 
WESTERN Cotton Mouss. 
Peromyscus gossypinus megacephalus, p. 196. 
Total length less than 7 inches (usually about 6.75 in.); tail vertebre not 
exceeding 3 inches (usually 2.75 to 3 in). WHITE-FOOTED Mouse. 
Peromyscus leucopus, p. 184. 
Total length 5.50 to 6.50 inches; tail vertebra less than 2.75 inches. 
PRAIRIE WHITE-FOOTED Mouse. 
Peromyscus maniculatus bairdi, p. 190. 
SECTION 2. General color of upper parts golden brown. Upper parts, includ- 
ing head, rich golden brown. SOUTHERN GOLDEN Mouse. 
Peromyscus nuttalli aureolus, p. 198. 
GROUP 3. Species which occur in northern Wisconsin. 
Tail vertebre usually from 3.25 to 4 inches long. 
CANADIAN WHITE-FOOTED Mouse. 
Peromyscus maniculatus gracilis, p. 193. 
Subgenus PEROMYSCUS Gloger. 
Plantar tubercles 6; ears dark or dark with whitish edges; dentine 
spaces of molars mostly confluent. 
Peromyscus leucopus (RAFINESQUE). 
WHITE-FOOTED Mouse. DEER Mouse. WHITE-FOOTED Woop 
5 Mouse. 
Musculus leucopus RAFINESQUE, Amer. Monthly Mag., III., 1818, p. 446. 
Peromyscus leucopus Ruoaps, Proc. Acad. Nat. Sci. Phila., 1896 (1897), p. 187 
(Tennessee). Haun, Ann. Rept. Dept. Geol. & Nat. Resources Ind., 1908 (1909), 
p. 496 (Indiana). OsGoop, N. Amer. Fauna, No. 28, 1909, p. 113 (Kentucky, 
Tennessee, etc.). 
Type locality — Western Kentucky. 
Distribution — From the Atlantic coast of Virginia and North Carolina 
westward around the southern end of the Allegheny Mountains, 
through northern South Carolina and Georgia to Oklahoma, north 
to southern Illinois and south to southern Louisiana. 
Description — Adult: Upper parts brown, darker on middle of back 
than on sides; under parts white, the concealed bases of the hairs 
slaty gray, the tips white; upper surface of tail brown, under surface 
whitish. 
Young: Feet white; plumbeous gray all over except the belly 
where the hairs are tipped with white. 
