FEB., 1912. MAMMALS OF ILLINOIS AND WISCONSIN CORY. 157 



Marmota monax canadensis (ERX.). 

 CANADA WOODCHUCK. 



[Glis] canadensis ERXLEBEN, Syst. Regni Anim., I, 1777, p. 363. 



Arctomys monax canadensis ALLEN, Bull. Amer. Mus. Nat. Hist., XI, 1898, p. 456. 



Type locality Hudson Bay. 



Distribution Ranging from northern Wisconsin and northern New 

 England, northward to Hudson Bay and west in Canada to about 

 longitude 120 and latitude 60. Intergrades in northern Wiscon- 

 sin with monax. 



Description (Specimen from Murray Bay, Province of Quebec, 

 Canada.) General appearance of M. monax, but smaller and colora- 

 tion of under parts decidedly more rusty brown; whole crown 

 brownish black, brownish black of crown including the eye and 

 extending considerably below it ; rest of upper parts grizzly, the hairs 

 being broadly tipped with gray. The tawny under fur on the back 

 usually has a very slight rufous brown tinge, under parts rusty brown 

 or red brown; muzzle pale; feet black; tail brownish black mixed 

 with brown hairs. 



Measurements Total length, about 20.25 m - (5 J 5 mm.) ; tail vertebrae, 

 about 4.25 in. (108 mm.); hind foot, 3 in. (74 mm.). 



Remarks Woodchucks from extreme northern Wisconsin, while not 

 typical canadensis, approach much nearer to that form than to 

 monax. A specimen taken by Mr. W. H. Osgood at Conover, 

 Vilas Co., Wisconsin, August 1 1, 1910, has the whole crown brownish 

 black and the rusty coloration of the under parts closely approach- 

 ing canadensis. Its measurements are as follows: (No. 18392, cJ 1 ) 

 Total length, 526 mm.; tail vertebras, 137 mm.; hind foot, 69 mm. 

 An adult male, killed at Minagua, Vilas Co., measured: Total 

 length, 520 mm.; tail vertebrae, 125 mm.; hind foot, 70 mm. 

 Specimens examined : 



Wisconsin Conover, Vilas Co., i; (O. C.) Mercer, Iron Co. (skull), i; 

 Langlade Co., (skulls), 2; (O.) Minagua, Vilas Co., 1 = 5. 



Minnesota Aitken, (melanistic), i. 



Canada Murray Bay, Province of Quebec, 4. 



