FEBRUARY 8, 1899 VoL. I, PP. 3-7 
PROCEEDINGS 
OF THE 
NEW ENGLAND ZOOLOGICAL CLUB 
SOME UNRECOGNIZED JUMPING MICE OF THE 
GENUS ZAPUS. 
BY CHARLES F. BATCHELDER. 
RECENT writers generally have assumed that Zapus hudsonius 
was so little susceptible to variation that, throughout the eastern 
portions of its range at least, the name Audsonius of Zimmermann 
was everywhere applicable, even in a subspecific sense. Exam- 
ination of extensive series of specimens from a number of localities 
in the Atlantic States and Canada shows, nevertheless, consider- 
able geographical variation, and brings to light several subspecies 
that have been overlooked within this area. 
In attempting to make any separation between different forms 
of this group, one is met by what at first seems to be an awkward 
stumbling-block. Zimmermann, whose name Dépus hudsonius, 
given in 1780,' has undoubted priority for the original species, 
stated its habitat as “ Hudson’s Bay.” As far as I am aware, no 
specimens are now available for comparison from anywhere in the 
regions immediately adjacent to Hudson’s Bay, and it is needless 
to say that this author’s description is not sufficiently explicit for 
use in discriminating subspecies. Hence the identity of Audsonius 
proper cannot now be determined. This, however, in the present 
case, is not so serious a difficulty as it might seem, for the readi- 
ness of these jumping mice to vary under differing environment 
1 Geogr. Gesch,, II, p. 358, no. 268, 
