1886. ] of the Common Eastern Chipmunk. 237 
“is considerably grayer, and the black lines of the back have no 
brownish margin. In a specimen from Washington [D. C.], the 
chestnut tints are darker than described above” (North American 
Mammals, 1857, 294). But his material was not sufficiently 
extensive to enable him to appreciate the constancy and signifi- 
cance of the differences noted. | 
Allen, in his most valuable paper on Geographical variation in 
color in North American squirrels, said: ‘‘ The increase in in- 
tensity of color from the north southward” is well illustrated 
in “ Tamias striatus, representatives of which from the southern 
parts of New York and Pennsylvania are much more highly 
colored than are those from Northern New England and the 
British Provinces” (Proc. Bost. Soc. Nat. Hist., Xv1, 1874,4). Later, 
however, the views above expressed seem to have undergone 
some modification, for the same author observes: “The very 
large number of specimens before me indicate that the present 
Species preserves great constancy of coloration. * * * Speci- 
mens from Southern localities are considerably brighter colored 
than those from more Northern sections, and average a little 
smaller. The difference, however, in either respect, is not very 
great ” (Monographs of North American Rodentia, 1877, 784- 
785). 
The examination of more than two hundred specimens has 
led me to differ with Mr. Allen in his last expressed views. 
His remarks concerning the deepening of color southward might 
have been stated more strongly, and still fall within the limits of 
truth.’ In respect to size, if the body as a whole was meant, my 
measurements of upwards of one hundred specimens in the flesh 
do not show the Southern animal to be the smaller, and the largest 
individual that has fallen under my notice came from Monticello, 
Mississippi. If, however, we turn to the extremities, the case is 
different, for the length of both fore and hind feet is greater in 
northern than in southern specimens, as shown in the accom- 
Panying tables: 
eS eos eee 
2 Mr. Allen’s views, as above enunciated, were based upon the examination of 
upwards of one hundred and fifty specimens; still, it is but fair to state that the 
Sreat majority of these specimens came from Northern localities, and were either 
YPical of the Northern form or intermediate between it and the Southern. He had 
æ four skins from sọ far south as Washington, D. C., and had not seen å single 
individual from the Carolinas. 
. 
