318 BULLETIN 17 8, UNITED STATES NATIONAL MUSEUM 



Balrd's description is based on six specimens, three from Fort Yuma, Calif., 

 and three from "Colorado bottom, Calif." There is nothing to indicate that 

 any one specimen was regarded as more typical than any of the others. It 

 now seems best to regard as cotypes only the three that came from Fort 

 Yuma, since this is a definite locality. The three specimens from "Colorado 

 bottom" are here treated as paratypes. Much of the description is based on 

 details of the soles of the feet, which could be seen more readily in alcoholic 

 specimens. Two of the Fort Yuma specimens were in alcohol, while aU the 

 "Colorado bottom" specimens were skins. 



*Peromyscus eremicus arenarius Mearns. 



Preliminary Diagnoses of New Mammals from the Mexican Border of the 

 United States, p. 2, May 25, 1896. (Reprint: Proc. U. S. Nat. Mus. 19: 

 138, Dec. 21, 1896.) 

 =Peromyscus eremicus Baird. See Osgood, North Amer. Fauna 28 : 239, Apr. 17, 

 1909. 



?5^. Skin and skull. Adult male. Rio Grande, about 6 miles 

 35413 ' 



from El Paso, El Paso County, Tex. February 25, 1892. Col- 

 lected by E. A. Mearns and F. X. Holzner. Original number 

 1513. 

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



f Peromyscus eremicus avius Osgood. 



North Amer. Fauna, 28: 247, Apr. 17, 1909. 

 147024. Skin and skull. Adult female. Ceralbo Island, off east 

 coast of southern Lower California, Mexico. February 13, 1906. 

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

 19125. 

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



*Peromyscus eremicus carmeni Townsend. 



Bull. Amer. Mus. Nat. Hist. 31 : 126, June 14, 1912. 

 198408. Skin and skull. Male. Carmen Island, Gulf of California, 

 Lower California, Mexico. April 3, 1911. Collected by H. E. 

 Anthony. Original number 109. 



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



f Peromyscus eremicus insulicola Osgood. 

 North Amer, Fauna 28: 246, Apr. 17, 1909. 

 147010, Skin and skull. Adult male. Espiritu Santo Island, off 

 east coast of southern Lower California, Mexico. February 9, 

 1906. Collected by E. W. Nelson and E. A. Goldman. Original 

 number 19077. 



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



f Peromyscus eremicus papagensis Goldman. 



Proc. Biol. Soc. Washington 30 : 110, May 23, 1917. 



