V.Memmler 1941 Peromyscus maniculatus May 17, Russian Gulch State Park, Mendocino Co., California, elev. 40 ft. Out of 31 traps set in a Riparian- marginal habitat there were 7 Peromyscus and 8 other species making 8[illegible]individuals animals. Dominant vegetation was: Salmonberry, Thimbleberry, Blackberry, and Nettle. All 7 were males. May 18, Traps, 26 in number were set the evening before. 6 P. maniculatus and 2 other animals were caught, each a different species. The habitat was the same but east rather than west from camp along the stream. May 19, 3 traps, 23 in number were set and caught 11 animals, 6 were Peromyscus. The habitat was the same and the spacing the same as May 17 and 18. May 20, Of 22 traps set, there were 10 catches. 3 of these were P. maniculatus males. The habitat and spacing of traps was the same as on May 17.