Quast 1948 Dipodomys merriami 2 June 3 bemi N. San Jose del Cabo, 250+ ft, Baja California One caught here by Murray last night. June 17 W end Llanos de Hiley, 50+ ft, Baja California One male (#320) caught in rat trap baited with walnut last night. Specimen was caught in edge of sand dunes near lake bed. Signs plentiful in sand and burrows common among Ocotillo and Cholla growths. The sand dunes are found on the periphery of the long series of wet weather lake beds that occur in this region. None were caught in 100 live traps set in flat lake bottom among short bushes and on dry, cracked mud by Dr Benson and myself. Perognathus baileyi on the lake bottom with a few on the sand dunes. Dipodomys merriami on the sand dune but not extending into the flat, packed soil. June 19 San Jorge, 5+ ft, 25°44'N, 112°05'W, Baja California Two males caught #388, 389 in hard packed sand of hill east of camp last night. Specimen caught in live traps baited with Bermuda grass seed along with Perognathus arenarius and baileyi. Habitat of open hard-packed reddish sand between clumps of Ocotillo, Frutia, Cholla, Petaya agris and Lemboi—most of which are heavily parasitized with Orchilla.