18 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
vertebrae, 34.4 ; hind foot, 18.8 ; ear from meatus, 14. Ten specimens 
in red pelage from the north shore of Lake Superior average: total 
length, 135.4; tail vertebrae, 36.4; hind foot, 19.3; ear from 
meatus 4 13.8. 
No cranial or dental characters were claimed for Evotomys \fus- 
codorsalis ’ by the original describer, and I am unable to find any in 
the large series of skulls that I have examined. Skulls and teeth of 
individuals of approximately the same age are so exactly similar that 
it is impossible to say, without examining the labels, which belong 
with red skins and which with brown. 
The peculiar appearance of Evotomys \fuscodorsalts ’ due to the 
entire lack of red is even more noticeable in freshly killed specimens 
than in skins. So much is this the case that when I first trapped 
the brown animals I was convinced of their specific distinctness. 
Careful comparison of fresh specimens, however, showed that in all 
external characters, except color, the red and brown individuals 
were exactly alike. It also showed, what is not always so apparent 
in dried skins, that, however different the actual color of red and 
brown specimens may be, the color pattern is exactly similar in the 
two. 
Wherever Evotomys ‘fuscodorsalis ’ has been found, E. gapperi 
has also been taken, and the two are invariably trapped in the same 
crevices and runways. At Nepigon and Peninsula Harbor it hap¬ 
pened that I caught the brown phase in heavy woods only and the 
red phase in deep woods and comparatively open places indifferently. 
Since the proportion of red to brown at these localities is probably 
as great as forty to one, the fact that the former was found in the 
greater variety of situations does not indicate that it prefers a dif¬ 
ferent habitat. 
The chain of intermediates between the most extreme red and 
brown specimens of this species 1 is so complete in the series col¬ 
lected by Mr. Goldthwaite at Hamilton Inlet, Labrador, that it is 
impossible to draw any line between the two phases. In the Lake 
Superior specimens the intergradation is almost as perfect. These and 
others from Quebec and New Brunswick vary so much among them- 
selves that several are worth detailed description. 
'$ ad. (No. 4215, collection of Gerrit S. Miller, Jr., Peninsula 
Harbor, Ontario, September 29, 1896) ; dorsal stripe, sharply 
1 While the Hamilton Inlet series is clearly Evotomys gapperi it is probably not refer¬ 
able to the typical subspecies. 
