Gary Identity of Eutamias pallidus (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 Merritt Gary. Original number, 682. 



General characters. Size a trifle larger than pallidus; coloration much 

 paler ; tail very long. 



Cranial characters. 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 buffy 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. Feetandrump grayish 

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

 narrow black submarginal band ; side hairs tipped w T ith white. Hairs on 

 upper surface 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 fif , Coll. Am. Mus. Nat. Hist., 

 June 9, 1894, W. AV. 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. Fresh postbreeding 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, 

 weakly 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.- Upper surfaces of feet grayish white 

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

 buff, 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 postbreeding 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 : 



