214 BULLETIN" 19, UNITED STATES NATIONAL MUSEUM. 



Microtus pennsylvanicus pennsylvanicus — Continued. 



Range. — Eastern United States and westward as far as Dakota 

 and Nebraska, shading into M. modestus of the western plains 

 and Rocky Mountains. In a general way it occupies the 

 transition zone from the Atlantic coast to the edge of the 

 Great Plains, 



*Microtus pennsylvanicus nigrans Rhoads. 



1897. Microtus 'pennsylvanicus nigrans Rhoads, Proc. Acad. 



Nat. Sci. Philadelphia, p. 307. June 18, 1897. 

 Type Locality.— Currituck, Currituck County, North Carolina. 

 Range. — Coast region of northern North Carolina and southern 

 Virginia, in the austroriparian zone. 



*Microtus pennsylvanicus acadicus Bangs. 



1897. Microtus pennsylvanicus acadicus Bangs, Amcr. Nat., 



vol. 31, p. 239. March, 1897. 

 Type Locality. — Digby, Nova Scotia. 

 Range. — Nova Scotia and Prince Edward Island. 



*Microtus pennsylvanicus shattucki Howe. 



1901. Microtus pennsylvanicus sJiattucM Howe, Proc. Portland 

 Soc. Nat. Hist., vol. 2, p. 201. December 31, 1901. 



Type Locality. — Tumble Down Dick Island, near Long Island, 

 Penobscot Bay, Maine. 



t*Microtus pennsylvanicus modestus (Baird). 



1857. Arvicola modesta Baird, Mamm. N. Amer., p. 535. 



1894. Arvicola insperatus Allen, Bull. Amer. Mus. Nat. Hist., 



vol. 6, p. 347. December 7, 1894. (Custer, Black Hills, 



Custer County, South Dakota.) 

 1900. Microtus pennsylvanicus modestus Bailey, North Amer. 



Fauna, No. 17, p. 20. June 6, 1900. 

 Type Locality. — Cochetopa ("Sawatch") Pass, Saguache 



County, Colorado. 

 Range. ^ — -Rocky Mountains and western plains from New Mexico 



to British Columbia, and from the Black Hills of South Dakota 



to central Idaho, and beyond, with slight variation, to the 



plains of the Columbia, mainly in transition zone. 



*Microtus pennsylvanicus fontigenus (Bangs). 



1896. Microtus fontigenus Bangs, Proc. Biol. Soc. Washington, 

 vol. 10, p. 48. March 9, 1896. 



1897. Microtus pennsylvanicus fontigenus Miller, Proc. Boston 

 Soc. Nat. Hist., vol. 28, p. 14. April 30, 1897. 



Type Locality. — Lake Edward, Quebec, Canada. 

 Range. — Eastern Canada, in the Hudsonian zone. 



