270 VERTEBRATE ANIMALS OP THE UNITED STATES 



41 mm.; forearm 42 mm.: North America, north of Mexico; common. 

 3. Pipistrellus Kaup. Small bats, similar to Myotis; dentition 

 2/3,1/1,2 /2, 3 /3 : 40 species, 2 in the United States. 



Key to the United States Species of Pipistrellus 



ai Tragus blunt, with tip bent forward P. hesperus. 



0.2 Tragus tapering and straight P. suhflavus. 



P. hesperiis (H. Allen) (Fig. 151). Color light yellowish gray; 

 length 75 mm.; tail 32 mm.; forearm 30 mm.: southern and western 

 Texas to the Pacific. 



P. suhflavus (F. Cuvier) (Fig. 151). Color light yellowish brown; 

 length 85 mm.; tail 40 mm.; forearm 34 mm.: eastern United States; 

 westward to Iowa and Texas; Austral zone. 



Subspecies of P. suhflavus 



P. s. suhflavus (F. Cuv.). Eastern United States. 

 P. s. ohscurus Miller. Color duller and less yellow: eastern and 

 central New York (Lake George). 



Fig. 152. — Teeth of Eptesicus fuscus, the upper jaw at the left (from Miller). 



4. Eptesicus Rafinesque (VespertilioL.). Dentition 2/3, i/i, 1/2, 

 sis'j interfemoral portion of membrane naked: 5 species, i in the 

 United States. 



Fig. 153. — Teeth of Nycteris borealis: a, N. b. teliotis; b, N. b. borealis, the upper jaw at the 



left (from Miller). 



E. fuscus (BesLUvois) . Big brown bat; house-bat (Fig. 152). Color 

 sepia brown; length no mm.; tail 45 mm.; forearm 45 mm.: United 

 States and Mexico; common. 



Suh species of E. fuscus 



E. f. fuscus (Beauv.). Size large: United States. 



E.f. osceola Rhoads. Color deeper and darker: Hillsboro County, 

 Florida. 



E.f. hernardinus Rhoads. Size large; wings and ears very dark: 

 San Bernardino, Cahfornia. 



