468 Fretp Museum or Naturat History — Zoétocy, Vor. XI. 
Type locality — Philadelphia, Pennsylvania. 
Distribution — Greater portion of the United States and southern 
Canada, from the Atlantic to the Pacific, except the southern parts 
of the Gulf states where it is replaced by a slightly different form. 
Description — Ears short and furred at base; tip of tail extending 
slightly beyond interfemoral membrane; wings and interfemoral 
membrane naked; general color of body sepia brown, paler on 
under parts, the back often showing a tinge of yellowish or cinna- 
mon; fur when rubbed showing darker brown at base; number 
of teeth in upper jaw 14. 
Measurements — Total length, about 4.40 in. (111.6 mm.); tail, 1.62 
in. (41 mm.); foot, .40 in. (10 mm.). 
The range of the Brown Bat includes the whole of Illinois and 
Wisconsin, and, while there is little doubt that it occurs in more or 
less numbers throughout both states, actual records are few. It is 
found in Indiana (Hahn); Missouri (Miller); and is reported from 
Minnesota by Herrick. The Milwaukee Public Museum collection 
contains seven specimens of this species from Milwaukee, which are 
all that are known to have been taken in Wisconsin. For Illinois, 
Miller records it from Richland and Hancock counties (/. c., p. 97), 
and Wood reports two specimens from Urbana, Champaign County ,— 
a very meagre list for a species which in 1893 Dr. Harrison Allen con- 
sidered to be ‘‘probably the most common species of any in the United 
States.” 
The Brown Bat, so far as known, differs but little in habits from 
those of our other species, except that according to Hahn in Indiana 
it does not have the same partiality for caves, comparatively few 
being found in such places (J. c., p. 633). They are strictly insectiv- 
orous and the good they do may be judged from the statement of Dr. 
R. W. Shufeldt who says: ‘‘They drink a good deal and have simply 
enormous appetites. One specimen, in the course of a single night, 
consumed 21 June-bugs (Lachnosterna fusca), leaving only a few legs 
and the hard outside wing-sheaths.”’* 
While some individuals may migrate southward more or less at the 
approach of cold weather, a considerable number at least remain in 
the North and hibernate. Ward records specimens taken in Mil- 
waukee between December 18 and February 6 (J. ¢., 1910, p. 181); 
and Seton mentions a specimen found dormant at Ottawa, Canada, 
December 3, 1894.} 
* Chapters, Nat. Hist. United States, 1897, p. 440. 
} Life Histories of Northern Animals, II, 1909, p. 1182. 
