Palm Sloan 1974 Journal 2 mi E Big Pine, Inyo Co., California April 13 light. We woke at 5:45 and left at 6:30 for the trap site. It was 32°F at the camp site. The wind was already blowing by the time we arrived at ≈7:00pm. Catches for the night: 9 Dipodops microps 7 Dipodops merionis, 1 Orzichonyx leucogaster, 5 Perognathus longaventris PETROMYSUS 2 Perognathus maniculatus, and 2 Reithrodontomys megalotis = 26 animals, none of which fled from exposure. None of the males had fully enlarged scrotal testes and no enlarges could be felt in the females. Seven of 9 Microps were saved, for now I am contemplating breeding experiments in the lab. One small male was released and one large individual escaped during examination. Three D. merionis were saved to be used in intersex aggression experiments. The holes from which merions were taken were smaller than those at wolf's hole or South Ache valley. We left for the San Fernando Valley at 9:30, arrived after 2:00 pm, unloading the animals in the protection of my parent's gazebo. At night I gave all animals lettuce and