H. Zinsser Baha San Carlos, Sonora, Mexico 1954 82 April 26 in camp. April 27 The most canyon to the west of the one in which we have camped is wide, actually more of a pass between the hills than a canyon proper. There are cist-filled mangrove lagoons separated from the Bay by a sand tier over while the road passes (see map). A short distance up canyon there is an extensive grove of palm trees. Bloodel looked for bats in the palms but without success, as was our experience yesterday in the canyon where our camp is located. I spent two or three hours this morning working in this wide canyon, and shot a number of Gremido- phorus tigris. The usual separation is again evident two: The acchi type (how C. burri) is in the now narrow canyons and on the steeper hillsides, while tigris inhabit the more open, level places. Tonight Bloodel set a trammel net for bats at the lagers of the two potholes, Three about 20 miles of magist driving on the highway north of Guaymas - no luckes. April 28 Eight bats were caught by the net (some taken out of it last night), including a Ligiostellus, a Conopterusine, an Epleaicus, a fruit-eating bat (Artibius) and two kinds of nectar-eating bats. Also in the net in the morning were a cardinal and a chipmunk (Calomys). We spent most of the day in a rented, outboard- powered boat investigating the islands between San Carlos Bay and Guaymas for fish-eating bats. Isla San Nicholas is little more than a vertical- sided rock projecting from the water. There are a few large cactus growing with shrubby plants atop the island, but that is much quaint. Bloodel found evidence of