WHITE-FOOTED MOUSE 



of tail sharply marked off from white underside. Total 

 length, 5.6-6.4 inches; tail vertebrte, 2.2-2.^ inches; hind 

 foot,_.72-.76 mch. Found in "Prairie region of the upper 

 Mississippi Valley in southern Wisconsin, Minnesota, Illi- 

 nois, Indiana, eastern Ohio, Iowa, Missouri, Oklahoma and 

 the eastern or humid parts of Kansas, Nebraska, South 

 Dakota and North Dakota; north to southern Manitoba 

 Upper Austral and Transition Zones, meeting the range of 

 P. m. nebrascensis along the border between the humid and 

 the arid^subdivisions." (Osgood) 

 Pallid White-footed Mouse.— Per omyscus maniculatus palles- 

 cens (Allen), 

 Smaller and paler than bairdi, which it otherwise resembles. 

 Upperparts pale russet with light sprinkling of dusky, darkest 

 on back; ochraceous buff spots at anterior bases of ears and 

 about base of tail in interfemoral region; "ankles" lightly 

 washed with brownish; tail dusky brownish on upperside 

 white below; underparts creamy white. Total length 4 8- 

 5.2 inches; tail vertebras, 2-2.1 inches; hind foot, .6-.68 

 inch Found m "Central Texas, from the vicinity of the 

 northern boundary at Gainesville south to the region imme- 

 diately west of Corpus Christi Bay. Lower Sonoran Zone ' ' 

 (Osgood) 



Chihuahua Plains Mouse. —Peromyscus maniculatus blandus 

 (Osgood). 

 Occurring in two color phases, buff or grav; size rather 

 small but larger than pallescens. Upperparts (gray phase) 

 pale vmaceous buff lightly sprinkled with dusky to produce 

 a general effect of grayish drab; white and vinaceous buff 

 ear tufts conspicuous; buff phase, pinkish buff above, with 

 dusky mixture to produce a pale cinnamon effect. Total 

 q'^^ 00 ^-^T.^-^ inches; tail vertebra, 2.4-3 inches; hind foot, 

 ^4-88 inch. Found m "Lower Sonoran Zone of western 

 lexas from the Pecos Valley westward; north along the 

 Pecos Valley and other Lower Sonoran valleys of southern 

 New Mexico to about latitude 34° north; south in Mexi- 

 co. ... " (Osgood) 

 Sonoran White-footed Mouse. — Peromyscus maniculatus 

 sonoriensis (Le Conte). 

 General appearance much like that of osgoodi but slightly 

 darker and with longer tail. Found as two color phases 

 but not as dimorphic in color as blandus. Pale, and prevail- 

 ing phase: upperparts ochraceous buff finely mixed with 

 dusky which is rather uniform over back and sides; broad 

 white edging on ears which are dusky; tufts at bases of ears 

 with pure white hairs anteriorly, but mainly ochraceous 

 buff; no well-defined dusky orbital ring or whisker spot; 

 ankles white to buffy with light dusky wash; underparts 

 white to creamy white. Dark phase: upperparts with 

 heavier dusky mixture on ground color of ochraceous to 

 tawny ochraceous; hairs darker at base; dusky face mark- 



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