E.V. Miller 1948 Tadarida femorosaca March 27 2900'± elev. La Calera, 2 mi. S.W. Santa Catarina, Nuevo Leon, Mexico. Shot a ♀ (no embryos) just as the sun was going down. Habitat - rocky, mountainous, desert country. Small River about 2 miles distant. Also shot T. mexicana and Pipistrellus sp. (by S.B. Benson) here. T. femorosaca and mexicana came out just as the sun was setting while the pipistrellos came out when the light was much dimmer. There was little wind and no clouds. March 28, evening, there was wind and considerable cloudiness. The bats did not appear until after the sun had set, despite the fact that it was darker earlier on this day than on the previous.