4 BATCHELDER — SOME JUMPING MICE [Pee 
appears to be so great as to make it reasonably certain that — 
whatever true Audsontus may be—it is at least subspecifically 
distinct from any of the forms under consideration. Neverthe- 
less, the evident intergradation between the latter makes it 
extremely improbable that they are specifically separable from 
hudsonius. It therefore seems best to treat them as subspecies of 
that species. 
After Zimmermann’s Dipus hudsonius, the next name that was 
applied to a member of this group was Dipus canadensis, pub- 
lished’ by Davies in 1798, in the Transactions of the Linnzan 
Society. Davies gave a colored plate and a description of the 
animal, based upon two specimens taken within a few miles of the 
city of Quebec. To this name unquestionably must be referred 
a well-defined form of which I have specimens from Quebec and 
from northern New York and Vermont. It may be described as 
follows : 
Zapus hudsonius canadensis (Davies). 
Head and back, above a line running from nose, through eye and base of 
ear, to root of tail, are dusky olive brown. Sides of head and of body, below 
this line, are light grayish buff. Neither of these areas has really a uniform 
color; that of the median tract is caused by a mixture of brownish black hairs 
with others which are of the same color but tipped with light yellowish brown; 
while the sides are covered with dull buff hairs with a scanty admixture of 
others of a brownish black, through which the plumbeous under fur shows 
slightly. The colors of the sides extend onto the upper surface of the legs as 
far as wrists and ankles. The under parts, from upper lip to base of tail, 
including under surface of legs, vary from milk white to pale creamy. Between 
this and the sides there is usually an imperfectly defined line of bright buff. 
The upper surface of the hind feet is dull light grayish, that of the fore feet 
similar but more yellowish. ‘The tail is dull brownish gray above, pale grayish 
beneath. All the colors of individuals taken early in summer are brighter 
than they appear in autumn specimens. 
The specimens I have examined from the type locality lack measurements 
taken in the flesh. I therefore give averages of a series of twenty-one adult 
males and thirteen adult females from Keene Valley, Essex Co., New York. 
Males: total length, 216.8; tail vertebra, 129.4; hind foot, 31.4; ear, 
16.9 mm. 
Females: total length, 216.5; tail vertebra, 129.1; hind foot, 31.1; ear 
(12 specimens), 16.3 mm. 
1 Trans, Linn. Soc. IV, p. 157, pl. VIII. 
