454 Fretp Museum or Natura History — Zoézoey, Vor. XI. 
SECTION 2. Upper surface of interfemoral membrane entirely bare, or furred 
slightly at extreme base; total length (nose to tip 
of tail) 4 or more inches. 
Part 1. Ears less than .75 inch long. 
Color of body brown (generally slightly yellowish 
brown), paler below; ears less than .75 inch 
long; fur of back, when rubbed, showing de- 
cidedly darker brown at base; tip of tail ex- 
tending slightly beyond the interfemoral mem- 
brane; number of teeth in upper jaw 14; whole 
Interfemoral membrane. number of teeth 32. Brown Bat. 
Eptesicus fuscus, p. 467. 
Color of body brown, paler below; ears less than .75 inch long; fur of 
back, when rubbed, not showing decided darker brown at base; 
number of teeth in upper jaw 18; whole number of teeth 38. 
Gray Bat. Myotis grisescens, p. 459. 
Part 2. Ears more than .75 inch long. 
Ears very large, about one inch or more in length. The extraordinary 
size of the ears will distinguish this species. Not as yet recorded from 
within our limits, but may occur in southeastern Illinois. 
BIG-EARED Bat. Corynorhinus macrotis, p. 476. 
SECTION 38. Upper surface of interfemoral membrane entirely bare, or furred 
slightly at extreme base; total length (nose to tip of tail) less than 4 
inches. 
Part 1. Upper incisors (front teeth between canines) 2. 
*Tail extending slightly beyond the interfemoral membrane; color dull 
umber brown above, paler below; fur decidedly darker at base; whole 
number of teeth 30. RAFINESQUE Bat. 
Nycticeius humeralis, p. 475. 
Part 2. Upper incisors (front teeth between canines) 4; total length 3.75 
inches or more. 
Color of body brown, paler below; length of forearm 1.60 inches (40 mm.) 
or more. Gray Bat. Myotis grisescens, p. 459. 
Part 3. Upper incisors (front teeth between canines) 4; total length less 
than 3.75 inches. 
Color brown, the fur much darker at base; ear when laid forward extend- 
ing well beyond end of nose; tragus slender. Say’s Bat. 
Myotis subulatus, p. 460. 
Color brown, the fur much darker at base; ear when laid forward not 
extending beyond end of nose; tragus rather short and broad. 
LittLe Brown Bat. Myotis lucifugus, p. 455. 
