SCIUROPTERUS. 157 
The Flying Squirrels are so called, not because they are capable 
of any true flight, but on account of a fold of skin attached to the 
front and hind limbs and body, which when stretched by the exten- 
sion of the arms and legs enables the animal to sail in a descending 
line for a considerable distance as if carried by a parachute. They 
are beautiful creatures with velvety fur and large, expressive eyes, 
nocturnal in their habits, and live in nests or holes in trees. Their 
aérial flights occur usually about dusk, and at this time in the locali- 
ties they frequent, several may be seen gliding from lofty branches to 
the base of a distant tree, up the trunk of which they hasten until the 
top is nearly reached, when the voyager is ready for another trip 
through space. 
Subfam. Il. Pteromyine. 
OSs. Sciuropterus. 
L—; P=; M22= 22 
I I l I 5 ; 
Sciuropterus F. Cuv., Dent’s du Mamm., 1825, p. 255. /d. Ann. du 
Mus., X, 1825, p. 126, pl. x. Type Sciurus volans Linneus. 
Limbs connected by a furred meml 
rane extending outwardly 
from the sides, and supported by a process from the olecranon. Tail 
depressed, flattened, thick; ears large; pelage of velvet softness. 
Fic. 29. ScCiIUROPTERUS VOLANS. 
No. 928 Field Columbian Mus. Coll. Nat. size 
UPPER TOOTH ROW. LOWER TOOTH ROW 
Enlarged 4 times. Enlarged 4 times. 
