Pearson 1951 Aetra Springs, Napa Co., Calif. Sept. 16 Left 12:30 with auto, Sisey Young, and bride. Stopped at Angwin and got 1 ♂ Cory in attle of Stone Minery (Henphill same day got thysarodes in one of the college buildings). Then drove to Aetra Springs and found Cory in attle overbetchen: one young ♂ and 2 adult ♀♀ and about 8 young ♂♀, all banded. About 4 escaped, one of them being a male (judging by band on r.-wing). Kept all of them to use in mating experiments. In the Aetra Mines tunnel found one adult ♀ (banded) and 3 adult males not banded, all with big testes. The red-dirt tunnel that used to have the Peromyscus nest 75 yards back now has about 6 nests, all of shredded bark. Saw about 6 Peromyscus at the lock-end of this tunnel. Also looked in a new tunnel of antler further up the hill - a good tunnel but no bats. Spent the night at the pool on Pope Creek - rained during night. Manhattan Mine, Knopville, Napa Co., Calif. Sept. 17 Catscumber had no bats except 1 Eptesians in same crock as last year. Marzanito Hill had 6 bats, one of them an unbanded ♂ young Cory, the others ♀ Cories, some banded. Also missed two in this tunnel. Got a ♂ in the tunnel above Marzanito Hill and missed one. Nothing in OP tunnel. Missed one in the Knopville tunnel also. Home after lunch. Was impressed by fact that almost all the Cories were anobe, ♂ and ♀. One young ♂ was apparently