Murray 1948 Journal June 4 b mi N San Jose del Cabo, 250+ft., Baja Calif. Packed up to leave, then went up the hill to look in a crack where Dr. Benson had seen bats enter early in the morning. Found a large rounded granite outcropping, and on its outer side an exfoliating sheet which left a crack of about 3/4" or between. Prying it off, we found about 10 bats. Several of these proved to be Myotis velifer, 2 may have been Tadarida mexicana, and 1 was Tadarida femorosacca which we kept. Found that the crack was largely filled with guano. Apparently the bats have been driving themselves out of their home in the course of time, and now there is space for only a few. Drove back into San Jose del Cabo where spent most of the time writing notes. In the evening at 7:00 a group of bats suddenly flew out from behind a metal sign on a building next to the plaza. We were quite sure they were Tadarida mexicana. At first about 30 burst forth together as if by signal. Most went off in the same direction with fast irregular flight, while a few strayed in other directions. a few moments later 3 more came out, and about a minute later 3 more.