196 Field Museum or Natural History — Zoology, Vol. XL 



Peromyscus m. eremus Osgood. (N. Amer. Fauna, No. 28, 1909, p. 47.) Type local- 

 ity — Pleasant Bay, Grindstone Island, Magdalen Islands. "Similar to P. m. 

 ahietorum, but color darker and tail shorter; similar to P. maniculatus, but paler 

 and slightly smaller." (Osgood.) 



Peromyscus m. argentatus (Copeland & Church). (Proc. Biol. Soc. Wash., XIX, 

 1906, p. 122.) Type locality ^— Grand Harbor, Island of Grand Manan, New 

 Brunswick, Color more grayish than either maniculatus or ahietorum, 



Peromyscus m. nubiterrcB (Rhoads). (Proc. Acad. Nat. Sci. Phila., 1896 (1897), 

 p. 187.) Type locality — Summit of Roan Mountain, North Carolina, alti- 

 tude 6370 feet. Similar to gracilis, but averaging smaller; tail longer than head 

 and body. 



Peromyscus gossypinus megacephalus (Rhoads). 



Western Cotton Mouse. 



Sitomys megacephalus Rhoads, Proc. Acad. Nat. Sci. Phila., 1894, p. 254. 

 Peromyscus gossypinus mississippiensis Rhoads, Proc. Acad. Nat. Sci. Phila., 



1896 (1897), p. 189. 

 Peromyscus gossypinus megacephalus Osgood, N. Amer, Fauna, No. 28, 1909, p. 



138 (Tennessee, Arkansas, etc.). Howell, Proc. Biol. Soc. Wash., XXIII, 1910, 



p. 26 (Illinois and Missouri). 



Type locality — Woodville, Alabama. 



Distribution — Southern Illinois, western Kentucky and Tennessee, 

 to northern Alabama, thence through northern Mississippi, eastern 

 and southern Arkansas to Oklahoma, eastern Texas and western 

 Louisiana. 



Western Cotton Mouse {Peromyscus gossypirus megacephalu 



