POCKET MOUSE 



blackish ; spot below ear indistinct ; feet white ; tail mixed 

 buff and dusky above, darker at tip, below buffy; under- 

 parts white. Total length, 7.6 inches; tail vertebras, 4.2 

 inches; hind foot, .96 inch. Found in "Southwestern 

 Utah, southern Nevada, and the adjoining portion of 

 California. Lower Sonoran Zone." (Osgood) 

 Perognathus mesemhriniis Elliot = Perognathus formosus 

 according to Grinnell. 



Subgenus Chaetodipus 



Characterized by medium to large size, harsh or spiny 

 pelage, naked soles of hind feet. 



Baileyi Group 



Bailey Pocket Mouse. — Perognathus baileyi baileyi Merriam. 

 Very large with long, tufted tail, colored like for?nosus. 

 Upperparts grizzled grayish buff; underside of tail whitish. 

 Total length, 8.6 inches; tail vertebrae, 4.8 inches; hind 

 foot, I.I inches. Found in "South central Arizona and 

 thence south into Sonora and northern Lower California, 

 Mexico." (Osgood) 



Hispidus Group 



Hispid Pocket Mouse. — Perognathus hispidus hispidus Baird. 

 Size large; pelage harsh but not spiny; tail about as long 

 as head and body; ^oles of hind feet naked medially. 

 Upperparts mixed ochraceous and black; sides almost as 

 dark as back; lateral line distinct, ochraceous; ears inside 

 dusky, buffy white on margins and outer sides; tail bicolor, 

 black above, whitish below; feet white; underparts white. 

 Total length, 8.2 inches; tail vertebra, 4 inches; hind foot, 

 i.o inches. Found in "Southern and western Texas, north 

 to Oklahoma and south into border States of Mexico. 

 Lower Sonoran Zone." (Osgood) 



Kansas Pocket Mouse. — Perognathus hispidus paradoxus 

 (Merriam). 

 Like typical hispidus but larger and with softer pelage; 

 color duller and paler. Total length, 9 inches; tail verte- 

 bras, 4.3 inches; hind foot, 1.06 inches. Found in "Upper 

 Sonoran Zone of the Great Plains from the Dakotas to 

 Texas, westward to base of Rocky Mountains." (Osgood) 



Oklahoma Pocket Mouse. — Perognathus hispidus maximus 

 Elliot. 

 Resembling typical hispidus but larger in size and brighter 

 in color. Upperparts ochraceous heavily mixed with black, 

 face without so much black; lateral line bright ochraceous 

 buff; inside of ear dusky, outside buffy; feet white; tail 

 above blackish brown, below white, sides iDuffy; underparts 



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