128 PROCEEDINGS : BOSTON SOCIETY NATURAL HISTORY. 



Micro tus bairdi Merriam. 



1897. Microtus bairdi MERRIAM, Proc. biol. soc. Washington, 



xi, p. 74. April 21, 1897. 

 TYPE LOCALITY. Glacier Peak, Crater Lake, Klamath County, 



Oregon. Altitude, 7800 feet. 



Subgenus PEDOMYS Baird. 



1857. Pedomys BAIRD, Mamm. N. Amer., p. 517. Type. 

 Arvicola austerus LE COXTE. 



* Microtus austerus (Le Conte) . 



1853. Arvicola austerus LE CONTE, Proc. acad. nat. sci. Phila., 



vi, p. 405. 

 1885. Arvicola austerus TRUE, Proc. U. 8. nat. mus., vn 



(1884), p. 597. 1885. 

 1896. Microtus austerus MILLER, North Amer. fauna, no. 



12, p. 9. July 23, 1896. 



TYPE LOCALITY. Kacine, Racine County, Wisconsin. 

 Allen (Bull. Amer. mus. nat. hist., x, p. 458, November 10, 

 1898) calls attention to the fact that the description of Wagner's 

 Hypudaeus ochrogaster (Schreber's Saugthiere, Suppl., in, p. 592, 

 1843) "admirably fits" this species, which he therefore proposes shall 

 stand as Microtus ochrogaster (p. 459). The name ochrogaster is 

 not mentioned by Bailey. 



Microtus ludovicianus Bailey. 



1900. Microtus ludovicianus BAILEY, North Amer. fauna, no. 



17, p. 74. June 6, 1900. 

 TYPE LOCALITY. Iowa, Calcasieu Parish, Louisiana. 



Microtus haydenii (Baird). 



1857. Arvicola (Pedomys) haydenii BAIRD, Mamm. N. Amer., 

 p. 543. 



1894. Arvicola (Pedomys) haydenii ALLEX, Bull. Amer. 

 mus. nat. hist, vi, p. 328. November 7, 1894.' 



1895. Microtus (Pedomys) haydenii ALLEX, Bull. Amer. 

 mus. nat. hist., vn, p. 267. August 21, 1895. 



TYPE LOCALITY. Fort Pierre, Stanley County, South Dakota. 



