Quart 1948 Antrozous mexicanus 2 May 25 El Carrigalito, 1400 ft. 5 mi. N. Santiago, Baja California. as thick on the floor below these spots. So far the Antrozous have been quite easy to catch while flying, seeming to forget their escape ways when chased with the hand net. They form quite a contrast with the Macrotes californicus which so far haven't been seen only in one small room on the ground floor and which fly immedi- ately to and through the exit, as if they had inspected the escape passages well before alighting. May 27 Same Location. One male caught last night of in second story stair-well of the building in which we are camped. Testis were enlarged, same for all specimens taken here, and vas deferens enlarged and in Uropataquin, Species no. 267. May 28 Same Location. Several more caught by Dr. Benson and Murray in house yesterday. May 29 Same Location. One netted last night about 9:30 P.M. as it was chased out of its perch in the ceiling of the second-story stair well. One of this species netted by Tavis as it flew over upper tanks (see map pg. 91 of Journal) at 8:30 P.M. yesterday. June 22 Santa Rosalillito, 25 ft. S.E. end Bahia de Concepcion, Baja Calif. Three lactating females netted over water hole between 9 and 11:30 P.M. tonight. See Journal pg. 132 for description of locality. It was observed