Order CHIROPTERA 



67 



and ringers brown or black; upper jaw with 1 or 3 pair- 

 of premolars 8 



8. Upper jaw with 1 pair of incisors; tragus curved and less 



than 4 mm. (about 1 £ in.) from notch to tip 



evening bat, Nycticeius humeralis 



Upper jaw with 1 pairs of incisors; tragus straight and 

 more than 4 mm. from notch to tip 9 



9. Ear large, extending 3 or 4 mm. (about l/£ in.) beyond end 



of snout when laid forward ; tragus slender and pointed, 



Hg. 51/> Keen's bat, Myotis keenii 



Ear not extending 3 or 4 mm. beyond end of snout when 

 la : d forward ; tragus broadly rounded, fig. S\a 10 



Fig. 51. — Ears of two bats: a, little brown bat; b, Keen's bat. 



in. 



l I 



12. 



Fur on under side of body white or pale gray; fur on upper 

 side of body dense, woolly, and brown, with a mole-gray 



cast; nose flesh-colored in living bat 



southeastern bat, Myotis austroriparius 



Fur on under side of body buffy gray or pinkish gray; fur 

 on upper side of body long, straight, brown, but without 

 a mole-gray cast; nose dark colored in living bat 11 



Forearm less than 35 mm. (lf£ in.) long; foot not more 



than 8 mm. (less than -% in. ) long 



small-footed brown bat, Myotis subulatus* 



Forearm more than 35 mm. long; foot more than 8 mm. 

 long 12 



Fur on upper parts of body with coppery or bronzy tipped 

 hairs; on under parts buffy gray; calcar lacking a def- 

 inite keel; foot usually 10 mm. long 



little brown bat, Myotis lucifugus 



Tin- species may occur in Illinois, but there are no official records of it. 



