FEB., 1912. MAMMALS OF ILLINOIS AND WISCONSIN CORY. 189 



Map illustrating the approximate distribution of the White-footed Mice (Peromyscus leucopus 

 and races) in eastern United States. 



Peromyscus leucopus (RAFINESQUE). Type locality Western Kentucky. Descrip- 

 tion as previously given. 



Peromyscus 1. noveboracensis (FISCHER). Type locality New York. Similar to 

 leucopus, but slightly larger and somewhat paler; pelage longer. 



Peromyscus 1. ammodytes BANGS. (Proc. New Engl. Zool. Club, IV, 1905, p. 14.) 

 Type locality Monomoy Island off coast of southeastern Massachusetts. 

 Similar to noveboracensis, but under parts pure white to roots of hairs. 



Peromyscus I. fusus BANGS. (Proc. New Engl. Zool. Club, IV, 1905, p. 13.) Type 

 locality West Tisbury, Island of Martha's Vineyard, off south coast of 

 Massachusetts. Similar but averaging larger than noveboracensis, and rostrum 

 of skull slightly more elongated. 



