MILLER: MAMMALS OF ONTARIO. 
11 
The skull equals the largest eastern specimens in dimensions, but 
the mandible, especially in the region between the incisors and 
molars, is distinctly more heavily built than in any others that I have 
seen. The audital bullae appear to be slightly smaller than usual, 
though not peculiar in form. The zygomatic processes of the 
maxillaries are shorter than in any other skulls that I have seen, and 
as a result the zygomatic arches as a whole are more oblique to the 
main axis of the skull. The peculiarities of this specimen are so 
great as to suggest that the form of Zapus insignis inhabiting the 
north shore of Lake Superior is at least subspecifically distinct from 
the typical animal. 
Measurements of Zapus insignis from Ontario. 
Locality. 
North Bay, Ontario. 
4i 44 u 
44 44 44 
44 44 44 
44 44 44 
44 44 44 
44 44 44 
4 4 4 4 4 4 
44 44 44 
Peninsula Harbor, Out. 
Number. 
X 
$ 
’ji 
Total 
length. 
4259 
A 
230 
4260 
A 
235 
4261 
A 
220 
4262 
A 
230 
4266 
A 
240 
4267 
A 
230 
4263 
? 
232 
4264 
? 
228 
4265 
? 
226 
4268 
? 
255 
Tail 
vertebrae. 
Hind foot 
Ear from 
meatus. 
142 
30 
14.4 
144 
31 
16.4 
130 
30 
16.8 
145 
31 
17 
144 
32 
17 
139 
31 
16.4 
139 
31.4 
16.8 
136 
30 
16 
140 
30.8 
15.6 
160 
QO 
•Jo 
16.6 
Fiber zibethicus (Linn.). 
The muskrat is very numerous at North Bay, Peninsula Harbor, 
and Nepigon. 
Mr. Brooks found it common at Mount Forest and Milton. 
Gapper mentions the species as occurring in the region between 
York and Lake Simcoe. 
Synaptomys fatuus Bangs. 
The small lemming recently described by Mr. Bangs from Lake 
Edward, Quebec, 1 is common at North Bay, where I trapped seven¬ 
teen specimens. I did not find the animal at Nepigon, but took 
three at Peninsula Harbor. 
1 Proc. Biolog. Soc. Washington, March 0,180G, vol. 10, p. 47. 
