POCKET MOUSE 



white below. Total length, 4.6 inches; tail vertebrae, 2 

 inches; hind foot, .6 inch. Found in northern Texas, 

 Wheeler County southwest to Ward County. 



Dusky Pocket Mouse. — Perognathus flavescens perniger 

 Osgood. 

 Very much like typical flavescens in size but much darker in 

 color. Upperparts intense black to brownish black, sides 

 and head mixed black and ochraceous buff; ears narrowly 

 edged with buffy; a bright buffy spot at lower base of ear; a 

 broad ochraceous buff lateral line; feet buffy; tail above, 

 dusky, below, whitish ; underparts rich ochraceous buff with 

 white on chin and narrow stripe down throat and breast. 

 Total length, 5.6 inches; tail vertebrae, 2.7 inches; hind 

 foot, .72 inch. Found in southeastern South Dakota, Clay 

 County; limits of range unknown. 



Merriam Pocket Mouse. — Perognathus merriami merriajni 

 Allen. 

 Pelage softer than in flavescens; ears small, colors bright; tail 

 scantily haired; sole of hind foot hairy on upper half. 

 Upperparts ochraceous buff heavily sprinkled with black, 

 darkest along dorsal region from nose to tail ; sides brighter, 

 more ochraceous; buff on ears and on spot behind ears; a 

 white subauricular spot; black transverse stripes on nose; 

 tail not sharply bicolor; underparts pure white. Total 

 length, 4.7 inches; tail vertebrse, 2.3 inches; hind foot; .64 

 inch. Found in "Subtropical region of southern Texas and 

 northeastern Mexico, and Lower Sonoran of central Texas. 

 The known range extends from Alta Mira, Tamaulipas, 

 northward to Washburn, Texas, and from this point south- 

 westward to the vicinity of Roswell, N. Mex. ; on the east it 

 reaches San Antonio, and on the west follows up the Rio 

 Grande as far as Comstock." (Osgood) 



Dutcher Pocket Mouse. — Perognathus merriami gilvus Osgood. 

 Slightly paler and yellower than typical merriami and pelage 

 softer; somewhat larger. Total length, 4.8 inches; tail 

 vertebrae, 2.3 inches; hind foot, .66 inch. Found in "West- 

 ern Texas and southeastern New Mexico. " Lower Sonoran 

 Zone." (Osgood) 



Baird Pocket Mouse. — Perognathus flavus flavus Baird. 



Very small; pelage very soft; tail short, moderately haired; 

 sole of hind foot hairy on upper half. Upperparts pinkish 

 buff with light sprinkling of black, darkest on back; lateral 

 line not sharply differentiated ; a prominent buffy spot back 

 of ear; tail almost concolor, slightly dusky above, pale buffy 

 below; underparts pure white. Total length, 4.5 inches; 

 tail vertebras, 2 inches; hind foot, .6 inch. Found in 

 "Upper and Lower Sonoran Zones from northeastern 

 Colorado and western Nebraska to northern Mexico, ex- 

 tending westward into central Arizona and eastward to 

 western Texas." (Osgood) 



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