Murray 1948 Tadarida femorosacca May 30 El Chorro, 500± ft., 2 mi W Agua Caliente, Baja Calif. Located beside a dam, N W of which is a deeP canyon, full of rocks, and running up into high rocky hills. In the evening a number of bats came flying out of the hills straight and high, starting at about 1:45. Later some of them came a little lower down the canyon. We could recognize the femorosacca by large size, noticeably narrower wings, and a sort of hunched up appearance of the shoulders. They flew very fast. When it was becoming dark they flew around over the pond behind the dam. There were several pools further up which they did not seem to go to. Shot 2 F. There were also many Daspterus flying. June 4 6 mi N San José del Cabo, 250± ft., Baja Calif. We looked in a crack up the hillside where Dr. Benson saw bats enter early this morning. There was a large rounded granite outcropping and on its upper, outer exposed surface an exfoliation which left a crack of about 3/4". Several bats came out, the first two looking like Tadarida mexicana; and several we caught were Myotis velifer. There was just 1 femorosacca pinned under the rock. The crack was almost completely filled with