FIELD BOOK OF MAMMALS 



Missouri Thirteen-striped Ground Squirrel. — Citellus tride- 

 cemlineatus hadius (Bangs). 

 Color of upperparts with more red than in typical tridecem- 

 lineatiis. Ground color of upperparts rich chestnut; light 

 markings buff; underparts strongly buff; tail above, chest- 

 nut at base, the hairs with blackish band and buffy tips, 

 below, deep rusty red, tipped with buff. Total length, ii 

 inches; tail vertebrae, 3.9 inches; hind foot, 1.5 inches. 

 Found in Missouri and northern Oklahoma. 



Black Hills Ground Squirrel. — Citellus tridecemlineatits oliva- 

 ceus (Allen). 

 About same size as typical tridecemlhieatus but different in 

 color. Ground color of upperparts dusky brown to blackish 

 without any dark reddish tinge; pale markings pale buffy 

 with slight olivaceous tinge; underparts strong cream buff, 

 the hairs not dusky at base. Total length, 10 inches; tail 

 vertebrce, 3.5 inches; hind foot, 1.4 inches. Found in the 

 Black Hills, South Dakota; limits of range unknown. 



Pale Striped Ground Squirrel. — Citellus tridecemlineatus pal- 

 lidus (Allen). 

 Paler in color than typical tridecemlineatus and slightly 

 smaller; ground color of upperparts chestnut sparingly 

 mixed with black, the light markings creamy white, the 

 light stripes nearly as wide as the dark ones; pelage of un- 

 derparts pale yellowish white to base. Total length, 9 

 inches; tail vertebree, 3 inches; hind foot, 1.3 inches. 

 Found from Montana and southwestern North Dakota 

 southeast to Kansas and south to western Texas and eastern 

 New A'lexico. 



Small Striped Ground Squirrel.- — Citellus tridecemlineatus par- 

 vus (Allen). 

 Smaller and paler than typical tridecemlineatus or pallidus. 

 Ground color of upperparts russet with a few black-tipped 

 hairs; light markings grayish white to pale creamy white; 

 underparts grayish white. Total length, 8.2 inches; tail 

 vertebra, 3.2 inches; hind foot, 1.2 inches. Found from 

 southeastern Montana through eastern Wyoming into 

 northeastern Utah and northwestern Colorado. 



Allen Striped Ground Squirrel. — Citellus tridecemlineatus 

 alleni (Merriam). 

 Nearly as small as parvus but with coloration as dark as in 

 typical tridecemlineatus ; tail darker and with less reddish 

 than in typical tridecemlineatus. Total length, 8.5 inches; 

 tail vertebrae, 3 inches; hind foot, 1.3 inches. Found on 

 the lower slopes of the Bighorn Mountains of Wyoming; 

 limits of range unknown. 



HoUister Striped Ground Squirrel. — Citellus tridecemlineatus 



hollisteri Bailey. 



"Smaller and darker colored than C. pallidus, larger and 



darker than parvus. In general appearance much like 



alleni, but with darker brown back and crown, and with 



212 



