Quast 1948 Pipistrellus hesperus 5 May 30 El Choro, 800+ ft, N.W. Agua Caliente, Cape District, Baja Calif. Several hundred seen at dusk last night, most of which were flying out of the canyon west of us at great heights. Later a few descended to feed around us, but by far the greater majority were flying to feed in the direction of Agua Caliente. June 6 1 Mi N. Cabo San Lucas, 20+ ft, Baja California One shot last evening at dusk by Dr. Benson. Time of shooting was about 7:15 P.M. Specimen was flying along evergreen hedge and large Mesquite tree near camp. Nearest hills other than the Point San Lucas are about 2 miles distant (east). We are about 1 mile from the rocks of the point. June 8 Punta Lasparino, 10+ ft, 23°16' N, 110°09' W, Baja California Several obtained by Murray and Dr. Benson at ranch near here, but in the mountains. Ranch contains open water in the form of a Tinaja. June 9 San Juan de la Cienega, 1600 ft W. de Rio Laguna, Baja Calif. One female with 2 emb (11mm) obtained at 7:15 this evening. # 339. Specimen was feeding over trees and bushes on side of hill west of camp. Pelage noticeably lighter than specimens I have obtained before. June 12 La Laguna, 6200+ ft, de Rio de Laguna, Baja California Shot male (#353) near forest (100ft) in flat at 7:30 P.M. this evening. The Pipistrellus were feeding with Epsecius fuscus at the forest border and among and over oak and pine trees.