Quest 1948 Journal 151 July 12 24 mi N.W. Punta Prieta 2000+ ft. Baja California Tadarida femorosacca (?) #451. This bat was flying very high at late dusk and was heard before it was seen, it uttering a very high piercing note continuously while in flight. The note is so high in frequency that it is almost inaudible but of such a character to be uncomfortable to hear. If this is the only bat uttering this note it is common throughout the peninsula south of here, this particular note being heard after dark at almost every camp at which we have stayed. 50 live traps set among rocks on small hill just west of camp last night caught one male Peromyscus eremicus. Traps set by others in the sandy flat valley floor caught Dipodomys agilis and merriami, Peromyscus maniculatus, and Perognathus aureus. Other bats obtained last night while shooting at dusk were Pipistrellus hesperus and Eptesicus fuscus. Very heavy fog and strong wind from the south this morning making the earlier part of the morning damp and quite uncomfortable. Minimum temp. last night was 50° F. Fog clearing at 10:00 A.M. July 13 Caterina 1850+ ft. Baja California Arrived here about 6 P.M. yesterday after 9