Murray 1948 2 Tadarida mexicana May 2 Mulege, 25 ft., Baja California Hunted in a store room in the government building here, where we could hear squeaking from the ceiling. The walls were plaster, the ceiling wood with supporting beams. Brooded in the long crack where ceiling and wall joined at one end but no bats would come out. Tried smoke and finally drove them out by prolonged pounding. Caught 20♀, 2♂, while some more escaped. May 16 Triunfo, 1700 ft., Baja California Found an intact, 2nd story room of an old brick compound which had mostly fallen down. One wall was missing, the rest plaster. The ceiling was wooden with beams running across, of which some were double with a 2 to 3 inch crack between them. Here were bats in great numbers, all Tadarida that we found except 2 Myotis velifer mixed in, and 3 Eptesicus fuscus which flew up from below. Netted 92 in all, most of which chewed their way out of the sack and were gone by morning. May 19 Same location Jervis and I returned to the same place, found the numbers much diminished. Those present were excitable and flew