August 1948 Peromyscus eremicus 2 May 16 4 miles N of La Paz, Sea Level, Baja California One ♀ (#183) caught last night on rocky hillside east of camp. Specimen was lactating and had two embryos.. May 18 Trunfo, 1200 ft. Baja California One male and one female (#206, 204) caught in live traps set around inside of brush fence last night. Brush fence surrounds an abandoned cornfield about 100 x 50 yards in extent. The female contained no embryos. Traps set in same location previous night caught no Peromyscus. May 20 Same Location. One ♀ (#224), with no embryos captured in live traps set along identical route as traps had been set twice before. June 12 La Laguna, 6200 ft., Sierra de la Laguna, Baja California 2 ♂ (#348, 349) caught last night in Museum Special traps baited with walnut. Traps were set in rocky canyon at east end of La Laguna among willows, grass, and large granite boulders. All traps were set within 5 feet of a running stream. Cought in same habitat as Peromyscus truei. July 12 24 mi N.W. Punta Prieta, 2000+ ft., Baja California One male #452 caught in live trap set on rocky hill west of camp last night (see Journal p. 150). None of the 47 other traps were disturbed.