Quest 1948 Peromyscus eremicus 7 April 11 Punta San Felipe, 50+ ft. Baja California One caught in live trap set on rocky slope of mountain in back of camp. Specimen escaped in process of killing. April 18 Cerro Prieto 30 ft 20 mi SSE Mexicali Baja California Two females with embryos caught in rocks 10 feet from mesquite - mud flat association last night. May 5 Bahia Concepcion 13 mi SE Mulaca, Baja California Two females with embryos caught in rocks above sandy area in back of beach. Specimens (#136 & 137) had embryos of 4 and 11 mm. #136 had two embryos on its left side, #137 had one on each side. Sandy area contained Cholla, Cardon, Mesquite, and Pitaya. Caught in same habitat were 4 Perognathus spinatus. May 10 San Jose de Comondú 200 ft Baja California Four females (164-167 mel) caught in live traps set along running water of ditch at arroyo bottom. Specimens were caught in traps set near town in Bermuda grass and beneath the palm trees. None of the females had embryos. One had a swollen uterus. Live traps were baited with bird seed. May 15 4 miles N La Paz, Sea Level Baja California 3♂ and one ♀ (#178-181 incl) caught in live traps baited with bird seed last night. Traps were set among porous porous lava rock fragments on hillside east of camp. Female had two embryos.