Quest 1948 Macrotus californicus 4 May 20 limit of San Antonio, Baja California into a blind tunnel and then closing off the exterior with a large mosquito net braced with hand nets and sticks. I put up five males (# 230-234 incl.) of the 26 ♂ & 35 ♀ living the next morning. (When May 21) written When a number (approx. 8) of the Macrotus were released the following morning they made attempts to group together, two following another lead through the sunlight brush already quite warm from the sunshine. They made attempt to hang up in the shady portions of large cactus and brush, but seemed quite uncomfortable in the morning heat. Several of the bats returned to the Dodge in which during the night they were kept, two actually banging them- selves into the closed windows of the cab. One was seen flying across a wash about a mile down the road at noon when we broke camp and left for Buena Vista. Generally speaking, the Macrotus were definitely lost and dismayed by the heat and sunshine. May 23 Buena Vista, 25± ft., 23°38'N, 109°41'W, Baja California about 300 of this species counted in a cave approx. 4 miles S.E. of here (see journal pg. 75). Of these thirty specimens were saved and cataloged by Tevis & Murray. The specimens was caught and counted by placing a large mosquito