Quast 1948 Perognathus arenarius 4 June 21 San Jorge, 5+ ft, 25°44'N, 112°07'W, Baja California up of short, small, Mangrove plants. Surrounding the mangrove extension is flat ground with small plants growing in it but still very wet and full of holes of burrowing crabs. Next to this area is a dry one in which the live traps were set followed by dry sand and Ocotillo & other plants of the sandy region. Dry soil existed on one side of a row of "Mangl Dulci" with the wet bog on the other. Live traps set along the "Mangl Dulci" row on the dry side captured two of this species.