V. Menneller 1942 37 Itinerary April 5, Mud Creek, 800 ft., 3½ mi. SW San Juan, Monterey Co., Calif. Baccharis sp., blackberry, elderberry, snowberry, coffeeberry, and monkey flower. These plants were tall, up to about 10 ft. The soil was dark humus with some fine gravel. The slopes on the hillside above are dominated by Artemesia. The 53 traps along the fence and 34 others set inside the fence yielded: 18 Peromyscus californicus, 2 Peromyscus maniculatus, 1 Microtus californicus, 1 Sorex and one Eroetia. The Eroetia was a brilliant orange ventrally and a violet red-violet dorsally. 16 traps were sprung without catch. On the hill- side 27 traps set caught: 3 Peromyscus californicus, 1 Peromyscus maniculatus and 1 Sorex. 3 traps were sprung. The heavy, almost constant rain during the night may have set off some of our traps. In the traps along the fence three contained remains of Peromyscus showing predation. We used nuts for bait as before and Museum Special Traps. Large numbers of Woodrat houses were seen in the ground cover under the live oaks. We had only one rat trap with us when setting our traps and this did not yield anything. Mrs. Grinnell set a few traps along the fence near a meadow and caught on Peromyscus