FEB., 1912. MAMMALS OF ILLINOIS AND WISCONSIN CORY. 101 



GROUP 3. Length of body, without tail, (nose to root of tail) less than 8 inches. 

 SECTION 1. Back marked with several distinct stripes. 



Back with but 2 whitish stripes and 5 black ones; rump rufous chestnut; 

 nose to root of tail, about 5 inches; tail vertebrae, 3 to 3> inches. 

 Occurs within our limits from northern Illinois southward. 



CHIPMUNK. Tamias strialus, p. 128. 



Similar to preceding but somewhat larger; general color grayer and rump 

 pale cinnamon brown with only a slight rusty tinge; spaces between 

 black stripes on back distinctly grayish nearly to the rump; nose. to. 

 root of tail, about 5% inches; tail vertebrae, about 3^ inches. 

 Occurs in northern Illinois and northward throughout Wisconsin. 



GRAY CHIPMUNK. Tamias striatus griseus, p. 130. 



Back with 4 pale stripes and 5 black ones; face with whitish stripe above 

 and below the eye; size small; nose to root of tail, about 4^ inches; 

 tail, about 3.K inches. Occurs within our limits only in northern 

 Wisconsin. LITTLE CHIPMUNK. 



Eutamias borealis neglectus, p. 135. 



Back with alternating pale and dark brown stripes, each dark stripe with 

 row of pale rounded spots down the middle; nose to root of tail, about 

 1% inches; tail, about 3K inches. 



STRIPED GROUND SQUIRREL. STRIPED GOPHER. 

 Citellus tridecemlineatus, p. 138. 



SECTION 2. Back not marked with several distinct stripes. 



PART 1. Front and hind legs joined together by thickly furred expansion of 



loose skin extending laterally from sides of the body. 

 Fur on under parts entirely white to the base; nose to root of tail vertebras, 

 about 4 inches; total length, about Q% inches. Occurs throughout 

 whole of Illinois and southern two-thirds of Wisconsin. 



FLYING SQUIRREL. 

 Sciuropterus volans, p. 102. 



Similar to preceding but larger and fur on under parts tipped with white, 

 but plumbeous gray at base instead of all white; nose to root of tail, 

 about 6^2 inches; tail vertebrae, about 5 inches; total length, about 

 \\% inches. NORTHERN FLYING SQUIRREL. 



Sciuropterus sabrinus, p. 106. 



PART 2. Front and hind legs not joined by an expansion of loose skin extend- 

 ing laterally from the body. 



Upper parts reddish brown; under parts white or whitish; upper surface 

 of tail reddish brown, the hairs near the end subterminally marked 

 with black; entire length, including tail vertebrae, between 12 and 14 

 inches. RED SQUIRREL. CHICKAREE. 



Sciurus hudsonicus loquax, p. 122. 



