MAMMALS OF UTAH 67 



TRUE'S MOUSE: TRUE'S DEER MOUSE 



PEROMYSCUS TRUEI (Shufeldt) 



Hesperomys truei Shufeldt, Proc. U. S. Nat. Mus. 1886, v. 

 407, pi. XXI, figs. 1, 5, 8. 



Peromyscus truei Elliot, Syn. N. Am. Mamm. F. C. M. Pub., 

 II, 1901, p. 139. Zool. Ser. 



Description — Fur moderately long and silky. Upper 

 parts a pale brown, darkest on back caused by a slight mix- 

 ture of black hairs. Feet and under parts white. Tail with 

 distinct pencil; upper part blackish. Ears very large, 1.0 

 in specimen described. Total length, 7.25; tail vert., 3.5; 

 hind foot, 0.95. (Warren.) 



Distribution — ^True's mouse is found throughout Ne- 

 vada, Utah and New Mexico, its range being practically co- 

 extensive with the juniper and pinyon belt. 



Habits — True's deer-mouse, easily distinguished by its 

 protruding eyes and immense ears, inhabits rocky places and 

 subsists chiefly on juniper berries, seeds and insects. 



DESERT HARVEST MOUSE 



REITHRODONTOMYS MEGALOTIS MEGALOTIS (Baird) 



Reithrodon megalotis Baird, Mamm. N. Am., 1857, p. 451. 



Reithrodontomys megalotis Allen, Bull. Am. Mus. Nat. Hist. 



V. 1893, p. 79; VII, 1895, p. 125. 

 Reithrodontomys megalotis deserti Allen, Bull. Am. Mus. Nat. 



Hist. VII, 1895, p. 127 (Oasis Valley, Nev.). 

 Reithrodontomys megalotis sestinensis Allen, Bull. Am. Mus. 



Nat. Hist. . XIX, 1903, p. 602, (Rio Sestin, northwestern 



Durango). 



Description — Color, unworn winter pelage : upper parts 

 mixed blackish brown and light ochraceous-buff, darkest in 

 middle of back, shading to nearly pure buff on sides; feet 

 and underparts white ; tail hair-brown above, whitish below ; 

 ears drab, usually with a tuft of ochraceous-buff hairs at 

 base. Unworn summer pelage : Similar to the fresh winter 

 pelage, but colors less strongly contrasted and black varia- 

 tions of upper parts much reduced. Worn spring and sum- 

 mer pelage : General tone browner and colors less contrasted 



