484 THE AMERICAN NATURALIST. [Vor. XXXIV. 
to be Peromyscus canadensis. The scarcity of this species 
seems remarkable. 
4. Evotomys gapperi. — A sail series was eal: mostly 
along the borders of woods. 
5. Microtus .— The meadow mouse of Prince 
Edward Island is apparently an intermediate form between 
M. pennsylvanicus and M. terrenove. It has the slightly more 
flaring zygoma and slightly greater interorbital constriction of 
the latter species. Regarding the enamel pattern of ;z 3, which 
Bangs! considers a characteristic feature of M. terrenove, I 
have not been able to distinguish any constant difference 
between that species and M. pennsylvanicus, although I. have 
examined carefully the skulls of both species. The nose 
patches in my specimens, while more pronounced than in M. 
pennsylvanicus from New Brunswick and other points, are less 
so than in M. terrenove ; and the color of the back is about 
intermediate between that of the latter species and of M. penn- 
sylvanicus from New Brunswick, some skins having the brown- 
ish gray color of New Brunswick specimens, and others the 
reddish cast of ¢errenove. The under parts are similar in 
M. terrenove, M. pennsylvanicus from New Brunswick, and in 
the Prince Edward Island skins. The hind foot in M. ter- 
rænovæ ranges, according to Bangs, from 22 to 25 mm., while 
in my specimens it varies from 20 to 2 3 mm. 
On the whole, I think the Prince Edward Island specimens 
are more similar to M. terrenove than to M. pennsylvanicus, 
but that they represent an intermediate stage between the two 
species, to which stage the New Brunswick pennsylvanicus skins 
show a decided approach. The specimens of M. pennsylvanicus 
from New Brunswick, to which I have referred in this com- 
parison, came from the northern portion of the province, in the 
region of the Tobique River. It would, I think, be premature 
to attempt to name the Prince Edward Island form without 
having for comparison a series of skins from the coast of New 
Brunswick, opposite Prince Edward Island, and also from the 
Magdalen Islands, which lie in the Gulf of St. Lawrence, 
1 Description of a New Field Mouse from Codroy, Newfoundland, Proc. Biol. 
Soc. Washington, vol. ix, pp. 129-132. 
