MAMMALS OF THE MEXICAN BOUNDARY. 



441 



Measurements of 58 specimens of Peromyscus eremicus anfhonyi — Continued. 



a American Museum of Natural History. 

 PEROMYSCUS EREMICUS ARENARIUS Mearns. 

 EASTERN DESERT MOUSE. 



Peromyscus eremicus arenarius Mearns, Proc. U S. Nat. Mus., XIX, 1896, p. 138 (p. 2 

 of advance sheet issued May 25, 1896; original description). — Miller and Rehn, 

 Proc. Bost. Soc. Nat. Hist., XXX, No. l,Dec. 27, 1901, p. 73 (Syst. Results Study 

 N. Am. Mam. to close of 1900). 



{Peromyscus eremicus] arenarius, Elliot, Field Col. Mus., Zool. Ser., II, 1901, p. 136 

 (Synop Mam. N. Am.); IV, 1904, p. 191 (Mam. Mid. Am.). 



Raton of the Mexicans. 



Type-locality. — Bank of the Rio Grande, about 6 miles above El 

 Paso, El Paso County, Texas. (Type, skin and skull. Cat. No. HHI, 

 U. S. National Museum.) 



Description. — Similar to typical Peromyscus eremicus, but paler, 

 with the pelage grayer and more silky, and the ears smaller. The 

 upper surface is pale ochraceous drab finely mixed with black, with- 

 out a darker median area; ears almost naked, but with a slight pubes- 

 cence on the convex surface; tail dusky drab mixed with hoary above, 



