544 
An examination of the table shows that young are born at all 
times of the year from January to October inclusive. It would seem 
likely that the same individual might produce three ltters a year. 
The number in a litter is rather small, varying from two to five, 
with an average of a little less than four. 
Apparently the sexes are separated during a good part of the 
year. At any rate the specimens caught during a night in a limited 
area almost invariably show a great preponderance of one or the 
other sex. 
Although these mice are supposed to be nocturnal in their 
habits, Fisher has shown that a number of them are taken by hawks.* 
Many are caught by owls, which, with weasels, skunks, and snakes, 
are probably their chief enemies in this vicinity. 
Although these mice are undoubtedly the most numerous mam- 
mals in the county, from an economic standpoint they are probably 
of little importance. They enter grain and corn fields and nest 
under the shocks, but the grain or corn eaten at first 1s usually waste. 
If, however, corn is allowed to remain in the shock till late in the 
winter, considerable damage may be done to it by these mice. They 
are said to enter barns and granaries in winter. A few such in- 
stances in this state have come to my notice. 
WHITE-FOOTED PRAIRIE-MOUSE. 
Peromyscus maniculatus batrdi (Hoy and Kennicott). 
Mus bairdit Hoy and Kennicott, Kennicott, Agr. Rep. Comm. Patents, 1856, pp. 
SO), 18h, SA 
Peromyscus michiganensis of authors, not of Audubon and Bachman. 
According to the recent arrangement of the genus by Osgood the 
maniculatus group, containing some 30 forms, is scattered over vari- 
ous parts of North America from the arctic plains on the north to 
the central part of Mexico on the south. The form bazrdi, of which 
the type locality is Bloomington, McLean county, Illinois, is said 
to have the following range: ‘‘Prairie region of the upper Mississippi 
Valley in southern Wisconsin, Minnesota, Illinois, Indiana, eastern 
Ohio, Iowa, Missouri, Oklahoma, and the eastern or humid parts of 
te The Hawks and Owls of the United States,’ Bull. No. 3, Div. Ornith. and 
Mamm., U. S. Dept. Agr. 
