MILLER: MAMMALS OF ONTARIO. 
13 
small mammals may be caught in the cavities inhabited by the 
lemmings. 
I have compared my Ontario specimens with those taken in 
Quebec by Mr. Bangs and also with examples from New Hampshire 
and Maine in Mr. C. F. Batchekler’s collection. They are in every 
way typical. A few of the older skulls are larger than any of those 
hitherto collected, but none show any approach to Synaptomys 
cooperi. Six of the females taken have well-developed mammae. 
As usual in the subgenus Synaptomys there are six of these, two 
inguinal and four pectoral. One caught at North Bay on Septem¬ 
ber 1 contained three large embryos, and others taken during August 
showed indications of recent sexual activity. 
MlCKOTUS PENNS YLVANICUS PENNSYLVANICUS (Ol'd) . 
The common meadow mouse is abundant in the clearings at 
North Bay. 
Abundant at Milton and Mount Forest (Brooks). 
Recorded by Gapper from the region between York and Lake 
Simcoe. 
While Microtus pennsylvanicus probably ranges throughout 
Ontario, the typical subspecies is so far as known restricted to the 
Transition and Canadian zones. 
Measurements of Microtus pennsylvanicus pennsylvanicus from 
Ontario. 
Locality. 
Number. 
Sex. 
Total 
length. 
Tail 
vertebrae. 
Hind foot. 
Ear from 
meatus. 
North Bay, Ontario. 
4082 
$ 
154 
41 
20.4 
12.8 
t t it 
t t 
4083 
$ 
171 
47 
21 
15.6 
it it 
it 
4086 
$ 
165 
46 
21 
13 
it 4 i 
t t 
4087 
s 
162 
48 
19 
13 
it it 
t i 
4088 
$ 
161 
45 
19 
13.4 
it it 
t t 
4090 
$ 
161 
50. 
21 
14 
it it 
t t 
4091 
$ 
183 
50 
21 
16 
i i it 
t t 
4092 
$ 
180 
53 
21 
15.6 
it t i 
i t 
4094 
$ 
180 
50 
21 
14 
it it 
U 
4084 
? 
178 
46 
20 
14 
it i t 
t t 
4085 
? 
160 
45 
19 
12.4 
tt t t 
tl 
. 4089 
? 
162 
48 
21 
13 
it fc t 
i 4 
4093 
? 
176 
51 
21 
13.4 
it k t 
•• 
4095 
? 
180 
52 
20 
15 
it it 
tt 
4090 
9 
172 
48 
21 8 
14 
