128 PROCEEDINGS : BOSTON SOCIETY NATURAL HISTORY. 



Microtus bairdi Meniam. 



1S97. Microtus bairdi ^Lii.RRixM, Proc. biol. soc. Wasliington, 



XI, p. 74. April 21, 1S97. 

 Type locality. — Glacier Peak, Crater Lake, Klamath County, 

 Oregon. Altitude, 7800 feet. 



Subgenus Pedomys Baird. 



1857. Pedomtjs Bated, Mamm. X. Araer., p. 517. T^q^e.- 

 Arvicola a aster us Le Co'te. 



* Microtus austerus (Le Conte) . 



l85o. Ari'iroJa austerus Le Coxte, Proc. acad. uat. sci. Pliila., 



VI, p. 405. 

 1885. Arcicola austerus True, Proc. U. 8. nat. mus., rii 



(1884), p. 597. 1885. 

 1896. 3Iicrotus austerus ^Milleu, Xortli Amer. fauna, no. 



12, p. 9. July 23, 1890. 

 Type locality. — Kacine, Uacine County, Wisconsin. 

 Allen (Bull. Anier. nius. nat. hist., x, p. 458, Xovember 10, 

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

 Hi/pudaeus ochrof/aster C^chveher's Sjiugthiere, Suppl., iii, p. 592, 

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

 stand as 3licrotus oc/irof/aster (\). 459). The name ochrogaster is 

 not mentioned by Bailey. 



Microtus ludovicianus Bailey. 



1900. Microtus hulovicianus Bailey, Xorth Amer. fauna, no. 



17, p. 74. June 6, 1900. 

 Type locality. — Iowa, Calcasieu Parish", Louisiana. 



Microtus haydenii (Baird). 



1857. Arvicola (Pedohu/s) haydenii Baird, Mamm. X. Amer., 

 p. 543. ' . 



1894. Arvicola {Pedomi/s) hayclenii Allex, Bull. Amer. 

 mus. nat. hist., vi. p. 328. Xovember 7. 1894. 



1895. Microtufi (Pedorni/s) haydenii Allex, Bull. Amer. 

 mus. nat. hist., vii. p. 207. August 21, 1895. 



Type locality. — Fort Pierre, Stanley County, South Dakota. 



