. The families and genera of bats . Bats; Bats. 258 BULLETIN 57, UNITED STATES NATIONAL crown area more than half that of first molar, its antero-internal cusp well developed. Lower premolars not peculiar, the bases of the crowns about as long as broad, the shaft of the anterior not as high as that of posterior, but with about the same area in cross section. Molars normal; m1 and m2 with the inner section somewhat reduced but with distinct hypocone; to3 with or without distinct metacone and third commissure; lower molars with the cusps in the usual posi- tion, but entoconid frequently
. The families and genera of bats . Bats; Bats. 258 BULLETIN 57, UNITED STATES NATIONAL crown area more than half that of first molar, its antero-internal cusp well developed. Lower premolars not peculiar, the bases of the crowns about as long as broad, the shaft of the anterior not as high as that of posterior, but with about the same area in cross section. Molars normal; m1 and m2 with the inner section somewhat reduced but with distinct hypocone; to3 with or without distinct metacone and third commissure; lower molars with the cusps in the usual posi- tion, but entoconid frequently reduced or obsolescent in m,. Skull (figs. 45-47) strongly built, though rather slender and with sagittal crest absent or slightly indicated, the rostrum well developed, always more than half as long as brain case, the entire dorsal profile from nares to occiput nearly straight, or at least with no strongly contrasting ele- vations and depressions; interorbital region and rostrum subterete, in most of the species distinctly hour-glass shaped; a slight lachrymal ridge; pal- ate slightly arched, with or without a small median .anterior foramen, the premaxillaries without trace of pala- tal branches; pterygoids parallel; basisphenoid pits present,well defined. External form slender, much as in Nyctinomus. Ears very large, rounded or squarish in outline, joined across forehead, extending slightly beyond nostril when laid forward, the ante- rior margin without horny processes; antitragus distinct but not thickened; keel greatly developed, flattened and expanded at edge; tragus small, flat, its upper edge squarish or rounded; lips full and expanded, though not conspicuously wrinkled. Muzzle pad well developed, deeply emarginate above, its upper edge and median ridge with minute horny processes and small spoon hairs. Wings, feet, tail, and membranes not peculiar. Species examined.—Eumops abrasus (Temminck), E. bonariensis (Peters), E. californicus (Merriam), E. glaueinus ("Wag
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Keywords: ., bo, bookcentury1900, bookdecade1900, booksubjectbats, bookyear1907
