68 



Order CHIROPTERA 



Fur on upper parts of body without bronzy tipped hairs; 

 on under parts pinkish gray; calcar with a small but def- 

 inite keel, fig. 39; foot usually 9 mm. long 



Indiana bat, Myotis sodalis 



Skulls 



jaw with 1 pair of incisors 2 



jaw with 2 pairs of incisors 3 



jaw with 12 teeth . . evening bat, Nycticeius humeral, s 



jaw with 14 teeth Lasiurus spp. 



jaw with 14 teeth big brown bat, Eptesicus fuscus 



jaw with 16 or more teeth 4 



jaw with 18 teeth (2 pairs of premolars) 



eastern pipistrel, Pipistrellus subflavus 



jaw with 20 t.eth (3 pairs or premolar:,) 

 jaw with 18 teeth (3 pairs of premolars) Myotis spp. 

 Upper jaw with 16 teeth (2 pairs of premolars) 6 



Rostrum (dorsal view) almost as wide as braincase 



silver-haired bat, Lasionycteris noctUagans 



Rostrum (dorsal view) about half as wide as braincase 



southeastern big-eared bat, Corynorhinus rafinefqui'i 



Upper j 



Upper 



Upper j 



Upper 



Upper 



Upper 



Lower 



Lower j 

 Upper 



MYOTIS LUCIFUGUS (LeConte) 

 Little Brown Bat 



Description.— The little brown bat, fig. 52, is of medium 

 size but, like all other bats, it appears to be much larger than 

 it actually is. Although its wingspread may be nearly 10 inches, 

 the animal weighs only a quarter of an ounce, and the head 

 and body are only about 2 inches long. 



The upper parts of the body have olive-brown or yellowish 

 brown fur with a bronzy sheen, and the under parts have gray- 

 fur washed with buff. The ears, wings, and tail membrane are 

 dark brown, nearly black, and are almost free of hair. 



Length measurements: head and body 1^-2 inches (45-52 

 mm.); tail \]/ 4 -2 inches (30-50 mm.); over-all V/at^Va '^ches 

 (82-95 mm.) ; hind foot }i inch (10-11 mm.) ; ear from notch 

 Y% inch (14-16 mm.). 



The skull is small; it has a short rostrum and an over-all 

 length of 14.6-15.1 mm. (about ?s inch). The braincase is no 

 larger than a dried pea. The incisor teeth are so small as to be 

 hardly visible. Dental formula: I 2/3. C 1/1, Pm l, 1 ^ M 3 3. 



Four closely related species — gray bat. Indiana bat, Keen's 

 bat, and southeastern bat — may occur in the same roosting 



