Munday 124 Journal June 20 San Jorge, 25° 44' N, 112° 07' W, Baja Calif. mesembryanthemum which grew over short mangroves at the edge of the thicket. All the traps, then, were set well clear of the ground in tide washed mangroves. June 21 I flushed an oyster-catcher out of the glass by the water. Again saw the purple martins, and there were two sandpipers on the shore. June 21 Same location In the live traps caught 2♂, 2♀ Peromyscus arenarius, these all well up into the brushy terrain. Released them all. Snap traps held 8♂, 7♀ Peromyscus maniculatus and 1♂ Neotoma lepida. Most of the Peromyscus were taken in the mangroves or on the glass, rather than along the edge. Particularly productive was the mesembryanthemum growing deep in the swamp. The Neotoma, however, was along the edge. I had seen droppings several times on branches well inside, but no sign of nests. Almost every trap was sprung, by either mouse or crab. I have caught several by the tail which seems too tough to break off. Put up 6; kept the rest as skull only. After lunch left for Comondu, where we stopped for the night at the same house