476 



REPOTIT OF STATE GEOLOOTST. 



Acad. Sci. for 1893, p. 128. Stone and Cram, Amer. Ani- 

 mals, p. 161, 1903. 



Citellus [tridecemlineatus] Allen, Bull. Amer. Mus. Nat. Hist., 

 Vol. XVI, p. 375, 1902. 



Diagnostic characters. — Back striped with six lines of buffy 

 white and seven wider stripes of brown ; stripes on the lower part 

 of the sides not all very distinct, however. 



Description. — The ground color of the back is a light chocolate 

 brown when viewed at a little distance, the hairs being banded with 

 chestnut and black. A rather faint row of light spots runs from the 

 back of the head to the base of the tail, through the middle of a 

 brown stripe. On each side of this, the pale stripes alternate with 

 the brown, the latter being all marked with a row of pale dots ex- 

 cepting the outer one, which is usually indistinct and without the 

 row of pale spots. The solid stripes are of nearly uniform width, 

 the light ones being about two millimeters wide and the brown ones 

 six millimeters. On the back of the neck the light spots become 

 joined in a solid stripe. The pale spots vary in distinctness and 

 size. Between them there is often an indistinct spot that is darker 

 than the rest of the brown. 



The forehead is tinged with yellowish brown. The lips are pale 

 buff. The ears, lower cheeks, throat, belly and feet vary from pale 

 buff to light yellowish brown. The tail above is chestnut in the 

 middle, this being bordered with a black line which is followed by 

 an outer fringe of buff. Below, the middle is lighter and the black 

 line is indistinct. 



The fore feet have very long, comparatively straight claws. 

 The external ear is a mere rim, two or three mm. in height. There 

 are large cheek pouches opening between the teeth and the lips. 



Measurements. — Average of three individuals from Porter 

 County: Total length, 275 mm. (11 in.) ; tail, 101 mm. (4 in.) ; 

 hind foot, 34 mm (% in.). 



Slmll and teeth. — The skull resembles that of the chipmunk in 

 form and size. The braincase is usually a little broader in the 

 I)resent species and the skull more convex above. The spermophiles 

 all have five cheek teeth, however, instead of four as in the chip- 

 munks. In the chipmunks the incisors are usually yellow or 

 brown, while in the present species they are white. 



Range. — This little ground squirrel has a range extending from 

 Saskat(!hewan to Oklahoma and from the western border of the 

 I)lains to northwestern Ohio. In Indiana it is found only in the 

 })rairio portion, not extending much south or east of the Wabash 



