282 BULLETIN 17 8, UNITED STATES NATIONAL MUSEUM 



"'^ . Skin and skull. Adult female. Amarsrosa River (near Ne- 

 33385 ^ ^ 



vada line [spring near Shoshone, altitude 1,560 feet]), Inyo 



County, Calif. February 26, 1891. Collected by Vernon Bailey. 



Original number 2520. 



Well-made skin in good condition ; skull Grade A. 



fMicrotus serpens Merriam. 



Proc. Biol. Soc. Washington 11 : 75, Apr. 21, 1897. 

 =Microtus oregoni serpens Merriam. See Hatfield and Hooper, Murrelet 

 16: 34, May 1935. 



76303. Skin and skull. Adult male. Agassiz, British Columbia, 

 Canada. December 2, 1895. Collected by C. P. Streator. Orig- 

 inal number 5068. 



Well-made skin in good condition ; skull Grade A. 



fMicrotus sitkensis Merriam. 



Proc. Biol. Soc. Washington 11 : 221, July 15, 1897. 

 73839. Skin and skull. Young adult male. Sitka, Alaska. Au- 

 gust 3, 1895. Collected by C. P. Streator. Original number 

 4745. 



Well-made skin in good condition ; skull Grade A. 



*Arvicola trowbridgii Baird. 



Mammals of North America, p. 529, 1857. 

 =Microtus calif omicus (Peale). See Bailey, North Amer. Fauna 17: 35, June 6, 

 1900. 



-—-■ Moimted specimen and skull. Monterey, Monterey County, 



Calif. Collected by W. P. Trowbridge. Cataloged January 4, 



1855. 



The mounted specimen is a poor-looking object, with patches devoid 

 of hair on each side. Skull Grade A. 



*Microtus tshuktshorum Miller. 



Proc. Biol. Soc. Washington 13 : 11, Jan. 31, 1899. 

 ~^- In alcohol, skull removed. Adult female. Plover Bay, 



Bering Strait, northeastern Siberia. 1865. Collected by John 

 Davison. Cataloged January 12, 1866; skull, November 10, 1898. 



Specimen is fairly well preserved; hair raflier loose; a considerable 

 bare patch on right side ; skull Grade A. 



fMicrotus umbrosus Merriam. 



Proc. Biol. Soc. Washington 12 : 107, Apr. 30, 1898. 

 68480. Skin and skull. Adult female. Mount Zempoaltepec, 

 altitude 8,200 feet, Oaxaca, Mexico. July 10, 1894. Collected 

 by E. W. Nelson and E. A. Goldman. Original number 6412. 

 Well-made skin in good condition ; skull Grade A. 



