Cary — Identity of Eutamias ixdlidus i Allen). 89 



Eutamias pallidus cacodemus subsp. nov. 



BAD LANDS CHIPMUNK. 



Tamias minimus Allen, Bull. Am. Mus. Nat. Hist., Ill, p. 110, 1890 (in 

 part, specimen from " Mauvaises Terres "). 



Type from Sheep Mountain, Big Bad Lands, South Dakota. No. 138,137, 

 U. S. National Museum, Biological Survey Collection, d* adult. Collected 

 September 2, 1905, by Mei-ritt Cary. Original number, 682. 



Geiurul characters.— Size, a trifle larger than pallidus; coloration much 

 paler ; tail very long. 



Cranial c/mrf»dtTS.— Skull similar to that of pallidus, but slightly larger 

 and heavier. 



Color.— Breeding pelage (May and June): Median dorsal stripe blackish, 

 with a slight admixture of ochraceous; lateral stripes pale ochraceous buff, 

 with an olivaceous tinge. Dorsal pair of light stripes cream gray, lateral 

 pair white. Facial stripes pale huffy ochraceous. Ears pale, lacking ochra- 

 ceous of fall specimens. Forehead gray. Sides and back of neck, sides of 

 body and flanks grayish white, with a trace of buff. Feet and rump grayish 

 white, underparts pure white. Undei' surface of tail cream color, with a 

 narrow black submarginal band ; side hairs tipped with white. Hairs on 

 upper surfiice of tail broadly white at base, then banded with black, and 

 apically white, producing a mixed black and white effect. 



A June male from Corral Draw (No. f Hf, Coll. Am. Mus. Nat. Hist., 

 June 9, 1894, W. W. Granger) is commencing to assume the fresh autumn 

 coat on head and shoulders ; while the back and rump present the extreme 

 phase of worn winter pelage, being faded and bleached until the stripes are 

 scarcely discernible. Fre.^Ji posdjreedivg pelage (August and September): 

 Median dorsal stripe dark tawny ochraceous, becoming blackish toward 

 rump ; lateral stripes tawny ochraceous. Dorsal pair of light stripes grayish 

 white; lateral pair broader, pure white. Dark facial stripes ochraceous, 

 weakJy indicated in palest examples. Anterior portion of ears bright 

 ochraceous. Forehead mixed gray and ochraceous, or plain gray. Post- 

 auricular spots large and white. Sides and back of neck (except dorsal 

 stripe), sides of body, and flanks washed with creamy buff, or a very pale 

 ochraceous in darkest individuals. Uitper surfaces of feet grayish white 

 to creamy white. Under surface of tail varying from clay color to cream 

 buft', the black submarginal band narrow. Hairs on upper surface of tail 

 basally and apically cream buff", the median zone black. 



Comparable specimens of E. pallidus in poslbreeding pelage have the 

 sides more strongly ochraceous, the dorsal and lateral stripes much darker, 

 and the under surface of tail ochraceous. 



Measurements. — Average of four adult males from type locality : Total 

 length, 216.5 (210-225) ; tail vertebrae, 103.3 (97-110) ; hind foot, 34.5 (34- 

 35). Type: Total length, 210; tail vertebrae, 100; hind foot, 34. Average 

 cranial measurements : Occipito-nasal length, 32.5 ; basilar length of 

 Hensel, 24.9; zygomatic breadth, 18.4 ; greatest breadth of braincase, 16. 

 Type: 32.3; 24.4; 17.6; 15.6. 



Specimens examined. — Total number, 32, all from South Dakota, as follows : 



