116 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY 



Evotomys nivarius Bailey. 



1897. Evotomys nivarius BAILEY, Proc. biol. soc. Washing- 

 ton, xi, p. 136. May 13, 1897. 



TYPE LOCALITY. Northwest slope of Mt. Ellinor, Olympic 

 Mountains, Washington. Altitude, 4000 feet. 



Evotomys proteus Bangs. 



1897. Evotomys proteus BANGS, Proc. biol. soc. Washington, 



.xi, p. 137. May 13, 1897. 

 TYPE LOCALITY. Hamilton Inlet, Labrador. 



Genus MICROTUS 1 Schrank. 



1798. Microtus SCHRAXK, Fauna Boica, i, Iste Abth., p.. 72. 

 Type. Microtus terrestris SCHRAXK = Mas arvalis PALLAS (by 

 elimination). 



Subgenus MICROTUS Schrank. 



* Microtus borealis (Richardson). 



1828. Arvicola borealis RICHARDSOX, Zool. journ., in, p. 517. 

 1885. Arvicola riparius borealis TRUE, Proc. U. S. nat. mus., 



vii (1884), p. 597. 1885. (Part.) 

 1897. \_Microtus~] borealis TROUESSART, Catal. mamm., pt. 



in, p. 563. 



TYPE LOCALITY. Great Bear Lake, Mackenzie, Canada. 

 Regarded as a distinct species by Rhoads (Proc. acad. nat. sci. 

 Phila., 1894, p. 286, October 23, 1894), but not mentioned by 

 Bailey. :,:,:? -xu; I H: 



* Microtus pennsylvanicus (Ord). 



1815. Mus pennsijlvanica ORD, Guthrie's geography, 2d 



Amer. ed., n, p. 292. 

 18*85. Arvicola riparius riparius TRUE, Proc. U. S. nat. mus., 



vii (1884), p. 597. 1885. (Part.) 



1 Revised by Bailey, 'North Amer. fauna, no. 17. June C, 1900. 



