April 1948 Journal 72 May 20 San Antonio, munift., Baja California east from the pass west of town. Upon leaving town a deserted shack was investigated for bats in the thatched roof. No bats were present, but two Peromyscus cremicus were chased out of the thatched roof into the afternoon sun. May 20 1/2 mile E of San Antonio, Baja California. Stopped at an old mine by the road. It was composed of a large tunnel entering the hill at road level and a slanting tunnel up from the main one leading outside to an opening about 200 ft higher than the lower tunnel. The mine was found to be full of Macrotes californicus and what Dr Benson tentatively called Leptonycter. I put up five of each type which are entered in the catalog under the above heading and date. About 100 bats of the two types were caught by chasing them into a blind tunnel and then closing the entrance with a large mosquito net. Both types of bats were found to bite, the "Leptonycter" very viciously. Over half of the bats were dead upon reaching a spot to camp about five miles down the road. They probably died from heat and suffocation-- some being packed very tightly in what