carte BATCHELDER — SOME JUMPING MICE 5 
A female from Orwell, Vermont, measured, in total length, 229; tail verte- 
bree, 130; hind foot, 30 mm., all of which are within the limits of variation of 
the Keene Valley series. 
A comparison of Z. /. canadensis with a jumping mouse found 
on Mt. Desert Island, Maine, shows the latter to differ in so many 
respects that I am led to distinguish it as 
Zapus hudsonius hardyi’ subsp. nov. 
Type, from Mt. Desert Island, Hancock County, Maine; taken August 24, 
1898, by C. F. Batchelder; adult 9, no. 1597, coll. C. F. Batchelder. 
Subspecific characters.— Similar in color pattern to Zapus hudsontus canaden- 
sis. The dark area of back and head is blacker, and the buffy of the sides 
paler, than in that subspecies. The white of the under parts is purer, 
especially on the throat, the hinder part of belly, and inside of thighs. The 
upper surface of the hind feet is silvery white, instead of pale grayish as in 
Z. h. canadensis ; there is a similar though less difference in the fore feet. 
The under side of the tail (at least in dried skins) is much more distinctly 
white, as contrasted with the pale gray of canadensis. 
In comparison with canadensis the skull averages slightly flatter and 
squarer, but the rostrum is apt to be more distinctly deflected. The anteorbi- 
tal foramen, when seen from in front, is somewhat triangular in shape, whereas 
in canadensis its outline approaches an elongated oval. The posterior wall of 
the orbit is more convex, the brain cavity encroaching more upon the orbit 
than in canadensis. 
Ten adults (four males and six females) yield the following average measure- 
ments: total length, 223.5; tail vertebra, 137.6; hind toe, 31.8; ear, 18.3 mm. 
The heightened contrast between the colors of the median area 
and of the sides, as compared with canadensis, is due in part 
to the black hairs being of an intense pure black, instead of 
brownish black, partly to the wholly black hairs apparently being 
more numerous, and partly to the paler and colder shade of the 
buffy hairs. 
Geographical considerations naturally raise a question as to the 
possibility of applying to this Zapus J. W. Dawson’s name 
acadicus,” which was based on specimens taken at Halifax, Nova 
1 Named for Mr. Manly Hardy of Brewer, Maine, a life-long student of the natural history of 
Maine, whose keen, painstaking, accurate observation might well serve as a model to all who 
come after him. 
2 Edinb. New Philos. Journ., n. s., III, 1856, p. 2, pl. I. 
