93. El Cayon Canyon, 3200 ft. E. base San Pedro Martir Mts, Lower California, Mexico. May 28 Gilmore 1926 late evening tonight. Killed two pipistrelle bats tonight. The bats are quite common in the evening. They are flying quite high, I in an uncertain fluttering manner during the early evening while there is considerable light, but later when it is quite dark they fly much lower and straighter. There are quite a few Ammospermophilus around here but they can not be caught in rat traps baited either with oats or with biscum ring. They are also quite wild and do not allow a good shot at them.