Quest 1948 Depodomys merriani 3 June 20 San Jorge, 5 ft, 25°44'N, 112°07'W, Baja California One female # 406 (No Embs) caught in live traps in same habitat as previous night. June 23 Santa Rosalillito, 25 ft, SE end Bahia de Concepcion, Baja Calif. One male # 435 obtained in forty-eight live traps set on sandy, flat ground bordering wash at this place. Slightly less than a full moon tonight and last night. The area is heavily grazed by cattle and the vegetation - Pitaya azia, Saramboulo, Cardone, Mesquite occurs in widely separated mounds with clear sand in between. Around these patches of vegetation the sand has been built up in mounds and in these sand mounds burrows are common. Traps set near and under these vegetation patches also caught one of this species and two Perognathus arenarius. Traps set by others of the group last night caught nothing.