Boulevard, Ft. 1942 Perognathus californicus Apr. 4 Mud Creek, 700 ft., 3 1/2 mi. SW San Juan, Monterey Co., Calif. One specimen was taken in a line of 134 Museum Special traps baited with peanut butter-rolled oats or acacia walnut and set all the way around a rather loaf-like hill in thick chaparral just below the bald, gray face. This specimen, a male, was trapped in an open stand of Artemisia californica where we extended the end of our trapline down toward camp. Apr. 8 Muddy Creek, 1000 ft., 1 mi. S Chualar Canyon, Monterey Co., Calif. One male was taken in a line of 127 traps set along the edge of the wood road in Artemisia californica (dominant), Baccharis sp. and Salvia mellifera. Apr. 10 Johnson Ranch, 900 ft., Chualar Canyon, Monterey Co., Calif. Six were caught in a line of 120 traps placed on the margin between a field of young grain and a stand of Artemisia californica with a grassy undergrowth. Five of the animals were male. The one female possessed no embryos. Three of the mice were badly eaten in the head and neck region, making them unsuitable for specimens. No other mice collected (Peromyscus, Reithrodontomy, Microtus) showed evidence of such predation.