Hooper, 1937 Berkeley, Alameda Co., Calif. April 25, In company with Bill Engels, Bruce Whitacker and Emerson Reed I went to Pinole for the purpose of obtaining bats. The locality more exactly is about ½ mi. N Pinole, Contra Costa Co. Here are located 3 large grain barns, the center one of which is now used for storage of miscellaneous objects. In this center structure we found Antrozous pallidus [illegible] to be abundant and Tadarida not uncommon. The bats were roosting in narrow spaces located between the shingles of the roof and a 1"x12" corrising around the edge of the roof. As many as 10 pallid and 1 free-tailed were dislodged from a space 10" long x 8" wide x 1½" high. Probably 30 or 40 Antrozous could have been easily collected, however we took only about 15 - and 4 Tadarida. Here then is evidence that: (1)Antrozous are gregarious as well as Tadarida; (2)that both will roost together in the same mass. The note or voice of the two is different; that of Tadarida more shrill and faster in cadence.