Fes., 1912. MamMats oF ILLINoIs AND WIscoNsIN—CorY. 453 
: GROUP 2. Upper incisors (front teeth between canines) 4. 
SECTION 1. Upper surface of interfemoral membrane 
furred from \% to % its length, the rest bare. 
Color sooty, frosted with white; whole number of 
teeth 36. Genus LASIONYCTERIS, p. 462. 
’ ‘ Mi: Color yellowish brown; whole number of teeth 34. 
Front view, showing Genus PIPISTRELLUS, p. 465. 
upper incisors and ca- 
nines much enlarged. 
SECTION 2. Upper surface of interfemoral membrane entirely bare, or furred 
slightly at extreme base. 
Ears less than .75 inch long; fur of back, when rubbed, showing decidedly 
darker at base; teeth in upper jaws 14; whole number of teeth 32. 
Genus EPTESICUS, p. 467. 
Ears less than .75 inch long; fur of back, when rubbed, not showing decidedly 
darker at base; teeth in upper jaw 18; whole number of teeth 38. 
Genus MYOTIS, p. 455. 
Ears more than .75 inch long; teeth in upper jaw 16; whole number of teeth 
36. Genus CORYNORHINUS, p. 476. 
KEY TO SPECIES 
KNOWN TO OCCUR WITHIN OUR LIMITS. 
GROUP 1. Upper surface of interfemoral membrane (membrane connecting tail 
with legs) completely covered with fur. 
Color of body hoary (brown mixed with grayish white); 
length about 5 inches; upper front teeth (incisors) 
between canines 2. Hoary Bat. 
Nycteris cinereus, p. 472. 
Color of body on upper parts reddish brown or yellowish 
red brown; length about 4 to 4.25 inches; upper front 
teeth (incisors) between canines 2. Rep Bat. 
Nycteris borealis, p. 470. 
Interfemoral membrane. 
GROUP 2. Upper surface of interfemoral membrane (membrane connecting tail 
with legs) not completely covered with fur. 
SECTION 1. Upper surface of interfemoral membrane 
furred from % to 4 its length, the rest bare. 
Color of body sooty brown or blackish, frosted with 
grayish white; length about 4 inches; whole 
number of teeth 36. SILVERY BAT. 
Lasionycteris noctivagans, p. 462. 
Color yellowish brown; length about 3.40 inches; 
Holertemorel mabe brane whole number of teeth 34. GEORGIAN Bat. 
Pipistrellus subflavus, p. 465. 
