Order CHIROPTERA 



65 



nies of bats are easily recognized by the mounds of (juano and 

 sometimes by the presence of dark stains on the ceilings where 

 clusters of bats have been suspended. The known distribution, 

 in the United States, of five species of bats having a limited 

 range in Illinois is shown in fig. 50. 



Economic Status. — Bats in Illinois are undoubtedly bene- 

 ficial because they feed primarily on insects and aid in reducing 

 the numbers of some important pests. Colonies of bats in build- 



SOUTHEASTERN 1 ^^ SOUTHEASTERN , 

 BAT BIG- EARED BAT' 



Fig. 50. — Known distribution, in the United States, of hats with 

 a restricted range in Illinois. 



