MAMMALS OK TIIK MEXICAN BOUNDARY 



4:u 



little shorter in the northern specimens; bu1 I can discern no other 

 difference of importance. The alleged difference in the form of the 

 frontal bones referred to by Mr. Ethoads a is due to difference of age 

 in the specimens examined. The skull and teeth of P. c. insignis are 

 shown in figs. 07 and 98. 



Habits and local distribution. — This large mouse is an inhabitant of 

 rocky places where bushes and oak trees grow. Young in the gray 

 coat were obtained &i Tecate, in Lower California, June 28, 1894; and 

 a female, containing two large young, was taken the same daw 



Miasm; m, nts of I ) specimt ns of Peromyscus ccHifornieus insignis. 



PEROMYSCUS EREMICUS (Baird). 

 WESTERN DESERT MOUSE. 



Hesperomys eremicus Baibd, Mam. X. Am., L857, pp. 17!', 180 (original description); 



Rep. U. S. and Mex. Bound. Sun., II, l'i. 2, .Mam.. 1859, p. II. 

 Peromyscus eremicus, Allen, Bull. Am. Mas. Nat. Hist., VII, p. 226, June 29, 1895 



Milleb and Rehn, Proc. Bost. Soc. Nat. Hist., XXX, No. I. Dec 27, p. 72 (Syst. 



Results Study X. Am. Mam. to dose of 1900). 

 [Peromyscus] eremic is, Elliot, Field Col. Mus.,Zool. Ser.,II, 1901, p. L36 1 Sj nop. Mam. 



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



Type-locality. — Old Fort Yuma, San Diego County, California. 

 (Co-types in the U. S. National Museum.) 



Geographical range. -Tropical and lower Sonoran /ones of the 

 Western Desert Tract. 



a Pror. Acad, Nat, Sci. Phila., L895, p 34 



