268 The Mammals of Colorado 
the tragus, whilst the portion of the outer margin of the 
conch opposite the tragus is called the antitragus. 
Other important characters are as follows: testes abdominal 
or inguinal; penis pendant; mammary glands thoracic and 
generally post-axillary; uterus simple or with more or less 
long cornua; placenta discoidal and deciduate; the smooth 
cerebral hemispheres not extending backwards over the 
cerebellum. 
FIG. 8l. SKELETON AND FLYING MEMBRANES OF A BAT 
c, clavicle; h, humerus; r, radius; u, ulna (rudimentary); d\ pollex, 
d2, d^ d^, d5, digits; 2 to 5 supporting wm, the wing mem- 
brane; w,w, metacarpal bones; ph^ , ph^ , ph\ first, second, and 
third phalanges; am, antebrachial membrane; /, femur; t, 
tibia; f.b, fibula (rudimentary); c, calcar, supporting im, the 
interf emoral membrane ; pel, postcalcaneal lobe. (From Flower 
and Lydekker) 
The dental series includes incisors, canines, premolars and 
molars and never exceeds i. f ; c. {; pm. -|; m. | X 2 = 38. 
Bats are usually divided into two suborders, one, the 
Megachiroptera, containing only one family, the Pteropidce 
