246 University of California Publications in Zoology [Vou. 17 
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Free edge of interfemoral membrane 
Fig. E. Wing of Hptesicus fuscus (drawn semidiagrammatically from spect- 
men no. 23522), X 1.11; labeled to show names of parts, as used in the present 
paper. 
KEY TO CALIFORNIA BATS 
I. Basep oN EXTERNAL CHARACTERS 
PAGE 
1. With noseleaf (see text-fig. F). Macrotus californicus 252 
1’. Without noseleaf. 
2. Tail extending conspicuously beyond free edge of interfemoral mem- 
brane (see pl. 19). / 
3. Total length greater than 140 millimeters; no horny exerescences 
on anterior margin of ear. 
Eumops californicus 370 
3’. Total length less than 140 millimeters; a row of horny excrescences 
on anterior margin of ear (see text-fig. W). 
4. A fold of membrane extending from the inner third of the femur 
to the middle of the tibia, forming a pocket at the thigh. 
Nyctinomus femorosaccus 360 
