Figure 6. — In the gray bat {Myotis grisescens), the 

 plagiopatagium attaches to the tarsus (A). In the other 5 

 species of myotids that are found in the Southeastern and 

 Mid-Atlantic regions, the plagiopatagium attaches to the 

 side of the foot (posterior margin of the metatarsals) at 

 the base of the toes (B). 



Figure 7. — keeled calcar (A) is characteristic of 

 Indiana bats {Myotis sodalis) and small-footed myotis 

 {M. leibii); an unkeeled calcar (B) is characteristic of 

 little brown {M. lucifugus) and southeastern [M. 

 austroripariiis) myotis. 



b. Dorsal fur dark brown; forearm dark and more than 

 32 mm — evening bat {Nycticeius humeralis) 



12. a. Plagiopatagium (wing membrane outside of hind 

 legs) proximal attachment to tarsus (ankle), well below 

 the base of the toes; pelage uniformly gray; hairs not 

 bicolored (Fig. 6a) — gray bat {Myotis grisescens) 



b. Plagiopatagium attached to side of foot at the base 

 of toes; pelage not gray; hairs bicolored (Fig. 6b) — 13 



13. a. Ear more than 16 mm long; extends more than 2 

 mm beyond the tip of nose when laid forward — 

 northern long-eared myotis {Myotis septentrionalis) 



b. Ear does not extend beyond the tip of nose when 

 laid forward — 14 



14. a. Calcar keeled (Fig. 7a) — 15 



b. Calcar not keeled (Fig. 7b) — 16 



15. a. Foot usually more than 7 mm, forearm usually 

 more than 35 mm; pelage short and wooly; black 

 mask around eyes absent — Indiana bat {Myotis sodalis) 



b. Foot usually less than 7 mm, forearm usually less 

 than 35 mm; pelage long and glossy; hairs around eyes 

 black giving the appearance of a black mask — small- 

 footed myotis {Myotis leibii) 



16. a. Tips of hairs are reddish; hair long and glossy — 

 little brown bat {Myotis lucifugus) 



b. Tips of hairs are not reddish; hair short and 

 wooly — southeastern myotis {Myotis austroriparius) 



6 



