Quest 1948 Eptesicusfuscus 6 June 22 Santa Rosalita, 25+ ft, SE end Bahia de Concepcion, Baja Murray netted one of this species that was feeding among the Cardones and Dr. Benson and Tevis shot several in the wash south of the coral. June 23 Mulege, 25+ ft, Baja California One female, #436, with two embryos of 19mm each, netted after dark tonight. Ten or twelve of this species had established feeding routes over a trail bordering large olive trees and a few shorter Mesquite trees. On the average they fed at a 10 to fifteen foot height and were flying lower than the tree tops. The "clicking" noise of their flight was obvious throughout the entire period that I attempted to net them. It seems as though this habit of feeding over a more or less clear and straight area bordering trees harboring the insects on which they feed is the best way to get ample food with the smallest ex- penditure of energy in flight. June 25 Los Martires, 300+ ft, 23 mi by road N.W. Landeros, Baja One male seen and shot this evening at dusk. The wind was blowing strongly and the bat was seen feeding close to the tops of small bushes in the desert sand among a few Cardones. I walked about 50 yards to the area in which I had seen it feeding and obtained it.