PLATE 20 
Fig. 21. Mastiff bat (Hwmops californicus, no. 19021 [or 2], 2); X 1.52. 
View of head with mouth opened to show dentition. Photograph of fresh speci- 
men secured at Sierra Madre, Los Angeles County. Note the large ear directed 
outward and forward, the small truncate tragus, and the semi-oval antitragus 
which is separated from the rest of the auricle by a deep notch. The form and 
position of the nostrils is here well shown. It will be seen that the two upper 
incisors are long, slender, and in contact at their bases, though diverging at 
the tips. 
Fig. 22. Dorsal view of skull of Huwmops californicus, no. 4327, 2. X 2. 
Fig. 23. Side view of skull of Hwmops californicus, no. 4327, 9. X 2. 
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