456 Field Museum of Natural History — Zoology, Vol. XI. 



Remarks — This species resembles M. subulatus, but differs in having 



a more rounded and less sharp-pointed tragus and shorter ears. 



In M. subulatus the ears when laid forward extend considerably 



beyond the end of the nose. 



The known range of this species includes the whole of Illinois and 

 Wisconsin. I have examined specimens from Hardin and Pope coun- 

 ties, Illinois; Miller records it from Warsaw and West Northfield 

 (/. c, p. 62); and H. Allen, from Cook and Alexander counties (/. c, 

 p. 80). 



Specimens from Wisconsin are reported by Jackson from Dodge, 

 Jefferson, Milwaukee, Rock and Waukesha counties (/. c, 1908, p. 32), 

 and he states the species is very abundant at Cassville, Grand Co., 

 and along the Mississippi River (/. c, 1910, p. 90); I have examined 

 specimens from Dodge, Burnett, Polk, Rush and Pierce counties; and 

 Dr. H. V. Ogden's collection contains specimens from Iron, Milwaukee, 

 and Waukesha counties. 



The Little Brown Bat is a natural cave dweller and is often found 

 in great numbers in such places, especially in winter; but during its 

 wanderings in summer it takes up its abode in almost any place which 

 offers concealment, such as in a hollow tree, behind a window blind, 

 or in a garret or outbuilding. I once found a dozen or more com- 

 fortably reposing behind a window blind which had remained closed 

 for some time. Mr. W. E. Snyder states that in September, 1901, 

 in Beaver Dam, Wisconsin, he found 60 Bats of this species in a gran- 

 ary, to which they had gained access through a broken window pane. 

 They remained there three nights only, after which they were seen no 

 more (/. c, p. 126). Hahn states that in winter this species is found 

 in enormous numbers in Wyandotte and other caves in southern 

 Indiana {I. c, p. 622), and they are known to frequent caves near 

 Rosiclaire and elsewhere in southern Illinois. 



In describing the habits of this species Stone and Cram say: "Most 

 northern bats become thoroughly dormant in cold weather, and it has 

 been stated, on good authority, that their daily sleep is, in reality, 

 hibernation, differing from the sleep of other warm-blooded animals 

 in the same manner that their winter hibernation does. But this 

 probably only refers to certain species. The little brown bats that 

 spend the days behind my blinds apparently only sleep in the ordinary 

 way, as they frequently get to crowding and nudge and poke each other 

 with their sharp bony elbows, becoming half awake and squeaking 

 peevishly as they endeavor to arrange themselves more comfortably 

 for the remainder of their nap. But this activity may be due to the 

 increased irritability of the muscular fibre, which is said to be an in- 



