Boulware, JT 1942 Peromyscus trui sp.? Apr. 2 Berglund Ranch, 1450 ft., 5 mi. N Corralitos, Santa Cruz Co., Calif. One male was trapped by Mrs. Brinell in the damp undergrowth in the redwood forest east of camp. Apr. 7 Muddy Creek, 1 mi. S Chualar Canyon, Monterey Co., Calif. A trapline baited with a mixture of peanut butter and rolled oats was laid on south-facing slope and around its base. Two males were caught in the 15 traps set at about 1100 ft. elevation where the steep, washed ground afforded a growth of Salvia mellifera and almost no ground cover. On long, less steep slope above this area, 62 traps yielded two males and one female. Salvia mellifera is dominant here with growths also of Artemisia californica, Baccharis, Lotus sp., a few ferns, and low grasses. The soil here is more reddish in color than that around camp and is quite gravelly. The female was with 2 embryos measuring 9 mm. Apr. 8 One male and one female taken in a line of 127 traps set along the edge of the wood road in a stand of Artemisia californica with some Baccharis sp. and Salvia mellifera. Apr. 10 Johnson Ranch, 500 ft., Chualar Canyon, Monterey Co., Calif. One female with six embryos was caught in one of 120 Museum Specials which were set in a stand of Artemisia californica and grass on the margin of a young grain field.