Boulware, PT 1942 Peromyscus californicus Apr. 2 Berglund Ranch, 1450 ft., 5 mi. N Corralitos, Santa Cruz Co., Calif. Traps set on two successive nights yielded four mice the first night and one mouse the second night. Two were ♀ and three were ♂. Traps were Museum Specials baited with walnut or a mixture of rolled oats and peanut butter. Three of the specimens were taken on a north-facing hillside along the edge of chaparral consisting largely of Baccharis with some poison oak, Ceanothus sp., and Lotus sp. This chaparral is in a closed stand and has but slight ground cover. The other two specimens were taken along a path going up the hillside thru of a stand of Artemisia californica and dry Lotus sp.(dirtclover). One male specimen was collected by Mrs. Binacell in the wet chaparral undergrowth of the redwood forest east of camp. Apr. 4 Mud Creek, 800 ft., 3½ mi. SW San Juan, Monterey Co., Calif. Four were caught in a line of 134 Museum Special traps placed all the way around a hilltop on the edge of an open stand of Artemisia californica containing some poison oak, Baccharis, Lotus sp., and grass. Three of the animals were male; one, female. Apr. 5 [illegible] were caught in 131 Museum Special traps baited with a mixture of peanut butter and rolled oats. Of the 17 traps which I set on the hillside above camp in the same habitat as of April 4, two contained P. californicus. The other traps were set on a west-facing slope, about ½ mile souths of camp, and along the fence at the base of the slope. The hillside is shady live oak habitat with a