Quest 1948 Journal 65 May 17 Triunfo, 1700 ft. Baja California Arrived here about 2:00 P.M. yesterday after a very hot drive from La Paz. Crossed the plain south of La Paz in the heat of mid day and noticed many new trees, shrubs, and cactus not seen north of La Paz. Triunfo is what remains of a mining town apparently quite elaborate at one time but now made up to a large extent of ruined buildings. The town is up an arroyo that runs out into the plain. The group obtained about 70 Tadarida mexicana, several Eptesicus and a Myotis velifer from the supports of the ceiling of a deserted building in the center of town. The bats were hanging between double 2x12 supports in the second floor ceiling. I put up some of the specimens. Shot two Pipistrellus hesperus last evening at dusk. Noticed that the Pipistrellus came out when the sun had disappeared behind the hill and flew for about half an hour, becom- ing more scarce the later it got. Saw other, larger, bats flying about 15 minutes after the appearance of the Pipistrellus - probably Eptesicus fuscus and Tadarida mexicana. One Eptesicus fuscus was shot by Dr. Brown at dark. The larger bats fly quite high when first seen but fly closer to the trees and shrubs on the ground as darkness increases.