1908] 
Jackson, List of Wisconsin Mammals. 
21 
males; Total length 151 mm.; tail vertebrae 67.3 mm.; hind foot 
20.5 mm.; /\verage measurements of three females: Total length 
174 mm. ; tail vertebrae 91.6 mm. ; hind foot 21 mm. 
I have always found the Canadian white-footed mouse most 
abundant among alder (Alnus) bushes near pine forests, and par- 
ticularly along gently sloping lake shores. Like other members of 
the genus they are nocturnal, and shortly after dusk they come 
from their holes to hunt for food. While sitting by the camp fire 
one evening I heard some mice not twenty-five feet from me. I 
baited a trap with walnut meat and set it among the alders ; I 
reset it twice, and in less than twenty minutes I had taken three 
adult Peromyscus canadensis. 
Peromyscus leucopus noveboracensis (Fischer). 
Woodland Deer Mouse. 
Peromyscus 1. noveboracensis is quite abundant in deciduous 
woods, being apparently more abundant in the southeastern part 
of the state than elsewhere. Whether its range overlaps that of 
P. canadensis has not yet been determined. 
Peromyscus michiganensis (And. & Bach). 
Michigan Deer Mouse. 
Peromyscus michiganensis is conspicuously absent in the vi- 
cinity of Lake Michigan, but in Walworth, Jefferson and Dodge 
Counties, and west to the Mississippi River it is quite abundant. 
Our knowledge of the northern extension of its range is not satis- 
factory. 
The Michigan white-footed mouse inhabits the prairie regions, 
where it may be found in grassy meadows, in patches of weeds, 
or along old fences ; occasionally it takes its abode in second 
growth timber and in brushwood. In the autumn this species fre- 
quently dwells in corn shocks in company with Microtus ochro- 
gaster, and if undisturbed will remain there to rear its young the 
following spring. The young of Peromyscus michiganensis are 
