U. Memmler 1942 36. Itinerary April 4, mud Creek, 500ft., 3 1/2 mi SW San Juan, Monterey Co., Calif. Rain during the night. We also caught 1 Perognathus ♂, 1♀ nursing Microtus, 3♂ + 1♀ Peromyscus californicus, 1♀ mousing Peromyscus maniculatus and 4 immature Peromyscus. These traps were set in Artemesia about 4 feet tall. Live Oak, Poison Oak, grass and some Lotus sp was also present. The heavy rain may account for the number of traps spring. The soil is full of fine gravel. It is a loose soil. Mrs. Grumell caught 2 Thomomys 1♀, 1♂ in 5sq. April 5, Jean and I set out traps last evening when the rain seemed to be stopping for a while. Mr. Augustini told us he had at some time put out poison for birds across the road from his lettuce field along the brush by the fence. He said he found dipos among the animals poisoned by this method. We, hoping he really had set out 53 traps along this fence, placing them thru into the brush beyond. The ground outside the fence was recently plowed it appeared. The habitat here at the base of the hill inside the fence was wet dense ground cover under Live Oaks. Plants included in the ground cover are: Poison Oak, Braken fern, Artemesia californica,