126 BULLETIN OF WISCONSIN NATURAL HISTORY SOCIETY. VOL. 2. NO. 2. 
30 trees, I failed to find a bat. That they were there I feel sure, 
which goes to show how well their color and position harmonize 
with their surroundings, when hanging head downward, with 
their wungs wrapped about them, as they take their daylight sleep. 
When they first appeared each evening they would fly close about 
the trees, within the dark shadows, then rise high in the air and 
work off toward the northwest. This northwestward movement 
was observed each evening when I visited their haunts. 
One was found dead on the ground, evidently in nowise in- 
jured, by which I learned their identity. 
I certainly had never seen them here before, which can be 
explained when we remember the well-known migratory habits of 
the bat tribe. 
Lasionycteris noctivagans (Silvery Black Bat.) 
An abundant species, particularly so about the streets of the 
city, in the early evening, where they may be seen in numbers, 
darting about among the trees. 
I have knowledge of several houses, where these bats roost in 
large numbers betw^een the closed blinds and the windows. One 
of these roosts was investigated one year, during the height of the 
bat season, and there was an almost solid column of bats the 
whole length of the blind — clinging to blind and window casings 
— a conservative estimate being 300 bats. 
My Otis hicifugus (Little Brown Bat.) 
This species came with the migration of Hoary Bats in Sep- 
tember, 1901, previous to which I had never taken them. 
One morning some 60 were found in a granary, having gained 
access through a broken window pane. They used this roost for 
only three nights, after which they were seen no more. 
Castor fiber (Beaver.) 
Exterminated Species. 
The Beavers, many years ago, had constructed a dam on the 
creek which flows out of the present lake at this place. Prior to 
that time our lake was merely a stream flowing through extensive 
marshes. This dam gave to our city its present name, but the 
Beaver has long since disappeared from the county. 
Odocoileus virginianus (Common Deer.) 
Many years ago these ruminants occurred here, so old settlers 
inform me. 
The Porcupine {Erethizon dorsatuui) and the Black Bear 
(Ursns americanus) doubtless were found here years ago, and the 
Canada Lynx {Lynx canadensis) doubtless has occurred. 
