Murray 1948 Journal May 24 Las Cuevas, 23° 34' N, 109° 39' W, Baja Caly. another, very large cave, with a domed high chamber and then a passage tapering back. At the rear were many Macrothrix californicus, apparently the only species present. We caught a total of 53 Natalus mexicanus mostly females, and 27 Myotis velifer. Traveling west, drove up a gentle flat slope of the usual dry brush to a place called El Carrizalito. Here is a large partly completed building which was meant to be a tuberculosis sanitarium until work stopped years ago. As it stands, is brick and plaster walls without completed doors or windows, and watched by a caretaker. He is permitting us to camp in a part of the ground floor. May 24 El Carrizalito, 1400 ft, 5 mi N Santiago, Baja Caly. At this location we look out over a great expanse of the countryside, mostly flat and cut by the Arroyo Santiago running out to The Sea just visible in the east. Nearer and to the west the Arroyo Divisio joins it. There is a steep hillside just above us, thickly bristling with large granite boulders. The vegetation is