1918] Grinnell: A Synopsis of the Bats of California 357 
Family MOLOSSIDAE 
Foot and leg short and stout. Ears variable, sometimes joined 
across forehead ; tragus much reduced; antitragus usually very large; 
anterior border of auricle never with basal lobe. Muzzle obliquely 
truneate, usually sprinkled with short modified hairs having spoon- 
shaped tips; nostrils simple, usually opening on a special pad, the 
upper surface of which is often set with fine horny excrescences. 
Wing narrow; fifth metacarpal only about two-thirds as long as third; 
membranes thick and leathery. Uropatagium short; tail projecting 
conspicuously beyond its free edge. Miller (1907, p. 243) recognizes 
ten genera, only two of which have been found to occur in the western 
hemisphere north of southern Mexico. 
Genus Nyctinomus Geoffroy 
Ears large and rounded, rising from middle point of forehead, 
extending distinctly beyond extremity of muzzle when laid forward; 
anterior border of conch with 6 to 12 horny execrescences; keel well 
developed; tragus small, flattened, squarely truncate above; anti- 
tragus variable in form, sometimes low and indistinet. Muzzle pad 
well developed and sharply outlined, its upper margin thickly set with 
horny points like those on anterior margin of ear; a line of similar 
points extends downward across middle of pad between nostrils. 
Upper lip full and wrinkled, rather thickly sprinkled with stiffened 
spoon-shaped hairs; feet stout; wings narrow (Miller, 1907, p. 251). 
Nyctinomus depressus Ward 
Tacubaya Free-tailed Bat 
Nyctinomus depressus Ward (1891, pp. 747-750, 2 figs.). Original deserip- 
tion; type locality, Tacubaya, Federal District, Mexico. 
Nyctinomus macrotis nevadensis H. Allen (1894, pp. 171-174, pls. 34-35). 
Deseription of supposed new form, from ‘‘ Nevada and California.’’ 
Nyctinomus nevadensis, J. A. Allen (1894, pp. 326-828). Description of 
adult male; type fixed. 
Nyctinomus nevadensis, Miller and Rehn (1901, p. 273). Type locality. 
Nyctinomus macrotis nevadensis, Elliot (1901, p. 417). Description; dis- 
tribution. 
Nyctinomus nevadensis, Miller (1902, p. 250). Declared to be a synonym 
of Nyctinomops depressus. 
Nyctinomops depressus, Elliot (1904b, p. 627). Deseription; distribution. 
Nyctinomops depressus, Stephens (1906, p. 275). Description; distribution. 
Nyctinomus macrotis nevadensis, Lyon and Osgood (1909, p. 280). Nature 
and location of type. 
Nyctinomus depressus, J. Grinnell (1913b, p. 283). Nature of occurrence 
in California. 
Diagnosis —Size large; total length 131 millimeters, free portion 
of tail, 33; muzzle not ‘‘concave’’ between ears; color, above, burnt 
umber; below, Prout’s brown. 
