116 PROCEEDINGS; BOSTON SOCIETY NATURAL HISTORY 



Evotoniys nivarius Bailey. 



1897. Erotormjs nivarius Bailey, Proc. biol. soc. Washing- 

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

 Type locality. — Xorthwest slope of Mt. Ellinor, Olympic 

 Mountains, AVasliington. Altitude, 4(>00 feet. 



Evotomys proteus Bangs. 



1897. Evotoniys proteus Bangs, Proc. biol. soc. Washington, 



XI, p. 137. May 13, 1897. 

 Type locality. — Hamilton Inlet. Labrador. ' 



Genus MICROTUS ^ Schrank. 



1798. Jlicrotus Sciiraxk, Fauna Boica, i, Iste Abth., p. 72. 

 Type. — Jlicrotus terrestris ScnR\:sii.=: J/ns arvah's I*ai.i.as (by 

 elimination). 



Subgenus MicPtOTus Schrank. 



* Microtiis borealis (Richardson). 



1828. Arvico/a borealis Richardsox, Zool. journ., iii, p. 517. 

 1885. Arvicoia ripariiis borealis TpwUE, Proc. U. S. nat. mus., 



VII (1881), p. 597. 1885. (Part.) 

 1897. \_Microtas'\ borealis Trouessart, Catal. mamm., pt. 



Ill, p. 563. 

 Type locality. — Great Bear Lake, Mackenzie, Canada. 

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

 Phila., 1891, p. 286, October 23, 1894), but not mentioned by 

 Bailey. 



* Microtus pennsylvanicus (Ord). 



1815. JIns iK-nnsiiJvanica Ord, Guthrie's geography, 2d 



Amer. ed., ii, p. 292. 

 1885. Arvicoia ripdrius riparius True, Proc. U. S. nat. mus., 



VII (1884), p. 597. 1885. (Part.) * 



1 Revised l>y Bailey, North Amer. fauna, no. 17. June 6, 1900. 



