410 



BULLETIN 56, UNITED STATES NATIONAL MUSEUM. 



PEROMYSCUS ARIZONA (Allen). 

 APACHE WOOD MOUSE. 



Sitomys americanus arizona Allen, Bull. Am. Mus. Xat. Hist., VI, Art. XIII, Nov. 7, 



ls'.tl, pp. 321, 322 (original description); VII, p. 229, Juno 29, 1895. 

 [Peromyscus americanus] arizonse, Elliot, Field Col. Mus., Zool. Ser., II, 1901, p. 125 



(Synop. Mam. X. Am.). 

 Peromyscus texanus arizonse, Miller and Rehn, Proc. Bost. Soc. Xat. Hist., XXX, No. 



1, Dec. 27, 1901, p. 84 (Syst. Results Study X. Am. Mam. to close of 1900). 

 [Peromyscus texensis] arizonse, Elliot, Field Col. Mus., Zool. Ser., IV, 1904, p. 186 



(Mam. Mid. Am.). 



Type-locality. — Fairbank, about 20 miles north of the Mexican 

 Border, on the San Pedro River, in Cochise County, Arizona. (Type, 

 skin and skull, in the American Museum of Natural History.) 



Geographical range. — The habitat of Peromyscus arizonse is the 

 wooded banks of streams of the Elevated Central Tract. Specimens 

 were taken on the San Bernardino, San Pedro, and Santa Cruz rivers, 

 along the Boundary Line; and on the Verde River, in central Arizona. 



Fig. sti.— Peromyscus arizon.*:. Skull, o, dorsal view; 6, ventral view; c, lateral view. 



At present it is known only from the wooded streams of Sonora and 

 Arizona, never having been taken in open or rocky country, away 

 from water. 



Description. — A large, rather stout mouse. In winter the upper 

 surface is tawny wood brown, mixed with gray and black; middle 

 area above considerably darker than the sides; feet and under parts 

 pure white; under pelage slate-gray; tail sharply bicolor, clove brown 

 above, white below; ears scantily clothed, drab, without distinct 

 hoary edging. In summer the coat is drab, lacking the tawny shade 

 of winter; and the under surface shows much of the gray basal por- 

 tion of the hair between the narrow points. The young are mouse 

 gray, and may he horn at any season of the year, those of winter hav- 

 ing longer pelage than in summer. The mamma' are \l:,. Length, 

 is:, mm.; tail vertebrae, 85; hind foot, 23. Skull (fig. 86), 28 by 14.5. 



Remarks. — The nearest relative of this species is the Peromyscus 

 tornillo, from which it is separated, on the Boundary Line, by the San 



