330 MAMMALIA : CHIROPTERA. — L. 
hanging, head downward, by their hind claws. Most of them are 
insectivorous, a few in tropical regions feeding on fruits. About 
400 species are known, chiefly of small size. The order is very 
sharply defined, but it has probably sprung from the same stock as 
the Insectivora. (xelp, hand; mrepov, wing.) 
a, Insectivorous; ears large; no leaf-like appendage to snout; hairs with im- 
bricated scales arranged in spirals. . . . VESPERTILIONIDA, 190. 
Famity CXC. VESPERTILIONIDA. (THE Common 
Bats.) 
Insectivorous Bats with the snout not appendaged, or merely with 
two lateral exerescences; wing membranes ample; tail completely 
enclosed in the interfemoral membrane or only the last joint ex- 
serted; fur of peculiar structure, each hair with a series of minute 
imbricated scales arranged in spiral. The largest family of bats, 
with about 16 genera; especially abundant in temperate regions. 
a. Nostrils simple, at tip of snout; ears moderate; forehead not grooved. 
6. Incisors 2:2. 
ce. Teeth 38; muzzle narrow, hairy in front of eyes; ears as long as head; 
slender species with thin wings and ears. . . . . Myoris, 564. 
cc. Teeth 82 to 36; muzzle nearly naked before eyes; ears shorter than 
head; stout species with thick wings and ears. 
d. Teeth 86; molars§ . . . . . . « + LASIONYCTERIS, 565. 
dd. Teeth 34; molars. . . . . . . + +  PIPISTRELLUS, 566. 
ddd. Teeth 82; molars$#.. . . . 2. 2s. VESPERTILIO, 567. 
bb. Incisors 4:4. 
e. Teeth 30; upper incisors small; wings and interfemoral mem- 
branes nearly naked... .. . . « Nycricetus, 568. 
ee. Teeth 32; upper incisors stout; ivlerfemoral membranes hairy 
above, the wings with furry patches. - « . Lasrurus, 569. 
aa. Nostril margined behind by grooves and glandular prominences; cheeks 
with large excrescences; ears very large (an inch high); teeth 86. 
- CoryYNORHINUS, 570. 
564. MYOTIS Kaup. (pis, mouse; ods, ear.) 
1089. M.subulatus (Say). Lirrzz Brown Bat. Face small, 
fox-like, with high forehead and pointed snout; ears large, slender, 
nearly twice the height of the erect tragus; ears reaching beyond 
nostril when laid forward; wings naked; interfemoral membrane 
naked except at base; face whiskered; color dull olive-brown. 
L. 3. E. 9. T. 14. E. N. Am., abundant everywhere; very 
variable. (Lat., awl-shaped.) 
1090. M. lucifugus (Le Conte). Ear and tragus short and 
broad, the ears reaching nostril when laid forward. L. 3}. Color 
glossy dull brown. E. N. Am., common. (Lat., shunning light.) 
