on Coryphomys in the Old Bale Mill. Between 5 and 10 escaped. 7 were trashed in 1949. We trashed 11 new adults, 3 young ff and 5 young ss. One f was still preg., but the young ranged old, from 35-43, so there were no very young bats present in the catch. Six of the 18 adults were not lactating or pregnant! The caretaker told us the barn was sprayed about 5-6 weeks earlier against termites, and this may account for the high reproductive failure. Caretaker says the bats were there in large numbers at the time of the spraying. Two embalmed mummies found on floor. At Aetna Springs the others had no Coryphomys, but Antrozous with young were along the wall near the chimney, and Tadarida & Myotis (including rimature Myotis) were behind the chimney. We found the Cory colony in the upper tunnel at Aetna Mines, and we believe we caught them all, although one escaped without seeing her bad. There were: 22 adults, 20 young. of the adults: 1 was 1 yr old (of 9 possible) 3 were 2 yr old (of 5 seen in 195?) 18 were 3 yr old & older. The 2 non-breeders were in the 3yr+ older young group. We have taken so many from this colony that the percentage returns for these groups are meaningless. Two ff of the 18 oldest group were