Quast 1948 Journal 16 April 15 Cerro De Centinela 300 ft 13 mi WSW Mexicali, Baja California. were put up by Teve & Murry and are listed in their catalogs under this date. The bait for the live traps was ground corn, the only one available at the time. Traps set tonight also use ground corn for bait. In the two nights we have been here, we have seen no bats flying at dusk, but five nighthawks were seen last night at dusk. Flies are very numerous in the daytime, but so far have seen no mos- quitoes at this location. Bats may be heard "chirp"ing overhead at the time of writing. The nearest water is an irrigation ditch approx 5 miles down the road (east) of here. Superdemya muriami are common in the wastes low on the slope which contain sand, but their place is taken by the Perognathus on the slopes of more gradual and gravel. Perognathus (presumable) . mounds & holes may be seen around Encle, and Creosote bushes. The hill north of us is about 800 ft above us and of a mixture of dark volcanic rocks and granite with heavy quartz veining on its face. Again, it is completely