Feb., 191 2. Mammals of Illinois and Wisconsin — Cory. 137 



shore of Lake Superior. He writes, ''Although it is universally dis- 

 tributed outside of thick woods at Nepigon and Peninsula, the little 

 chipmunk shows a marked preference for open rocky hillsides, while 

 the big chipmunk prefers the edge of the forests, where stumps and 

 logs furnish it a more congenial shelter. . . . While T. striatus on 

 the north shore of Lake Superior hibernates near the end of September, 

 immediately after the first heavy frosts, T. quadrivittatus remains active 

 much later — probably until the snow cuts off its food supply. The 

 small chipmunk was actively running about in the light snow during 

 the second week of October, 1896, although the temperature during 

 the day averaged about 15° F. On October 23, 1 found an adult female 

 in a nest built of feathers and soft vegetable fibers at the end of a 

 tunnel under a clump of bearberry. The tunnel was about two feet 

 long and terminated a foot or more beneath the surface in a chamber 

 about the size of a cocoanut. The chamber was completely filled by 

 the nest, which contained, in addition to its occupant, a small store of 

 seeds of various weeds and wild fruits." (/. c, p. 31.) 



Specimens examined from Wisconsin and adjoining states: 

 Wisconsin — Camp Douglas, Juneau Co., 8; Lac Vieux Desert, Vilas 

 Co., 7; Conover, i; (M. P. M.) St. Croix Dam, Douglas Co., 5; 

 Pembine, i; Divide, Vilas Co., i; Marinette, 10; Upper St. Croix 

 Lake, 5; Yellow River, Burnett Co., 5; Mouth Namekagan River, 

 i; Cataline, 3; Kelly Brook, Oconto Co., 5; (0. C.) Fisher Lake, 

 Iron Co., 2 = 48. 

 Michigan — Park Siding, 12 ; Sevey, i = 13. 



Subfamily MARMOTINiE. 

 Genus CITELLUS Oken. 



Citellus Oken, Lehrb. der Naturg., Zool., II, 1816, p. 842. Type Mus 



citellus Linn. 



Form squirrel-like, but tail less bushy; color pattern variable; 

 cheek pouches developed; hind feet with five developed toes; front feet 

 with four developed toes and a rudimentary thumb. Skull relatively 

 heavier than that of Sciurus; postorbital processes slender and spine- 

 like; upper premolars two, the first much smaller than second; ante- 

 orbital foramen round or oval with tubercle on outer lower edge. Two 

 species belonging to this genus occur in Illinois and Wisconsin. 



I — I o — o 2 — 2 ^ ~~ ^ 



Dental formula: I. j C. j Pm. j M. ^^ — ^=22. 



i-i 0-0 i-i 3-3 



