90 Cary — Identity of Eutamlas pallidm (Allen). 



Corral Draw (near Sheep Mountain) 12 (Coll. Au). Mus. Nat. Hist., VV. W. 

 Granger) ; Cheyenne River Bad Lands 12, and " Mauvaises Torres " 1 (Coll. 

 U. S. Nat. MuH., L. Stejneger and F. V. Hayden, respectively) ; Sheep 

 Mountain 7 (Biol. Surv. Coll., Merritt Cary). 



Remarks.— iio far as at present known, this beautiful chipmunk, which is 

 by far the palest member of the genus, occurs only in the Big Bad Lands 

 of western South Dakota, and the Hat Creek Basin Bad Lands of extreme 

 northwestern Nebraska*— the Mxiivdises Tears of the French voyageurs. 

 The extreme pallor of coloration is manifestly due to environment. The 

 white, alkaline soil, which supports scarcely a vestige of vegetation over 

 large areas, exerts a strong bleaching effect upon the few mammals re- 

 stricted to the Bad Lands. The most marked instance of this among 

 mammals, aside from chipmunks, is Neoloum rwpkolu, the palest wood-rat, 

 which occurs only among the Bad Lands. 



*While colU'ctiiifi in tlic Iliit Creek Basin in ]'.)01, tlic writer often saw very pale 

 chipmunks iu the Bad Lands of lliat region, but unfortunately eolleeted no specimens. 



