Boulder, ft. 1942 Hipodomys Apr. 2 Berglund Ranch, 1450 ft., 5 mi. N Corralitos, Santa Cruz Co., Calif. Hipodomys were trapped here on both nights in which we had traps out. Three were caught the first night and five the second night in 146 Museum Special traps, some of which were baited with walnut and meat with a mixture of peanutbutter and rolled oats. Five of the specimens were trapped on the edge of chaparral (cloverstand) consisting largely of Baccharis, with some poison oak, Ceanothus sp., blackberry, and coffeeberry. This chaparral clothed the south-facing slopes of hills topped by more or less open ridges. One of the kangaroo rats was trapped on a steep, well-drained hillside in a closed stand of Baccharis and deer clover (Lotus sp.). The other two were taken on a hilltop covered by an open stand of Baccharis in which are scattered clumps of deer clover (Lotus sp.) and also plantings of young Monterey and Big Cone pines (6-10 ft. high). The soil of these hills is very sandy and powdery. Of the 8 rats caught, 5 were males. One female contained no embryos. The other two females each had 2 embryos about 4 mm. long. Several of the rats trapped dragged the traps 10 or 15 feet downhill. One precipitated itself down a steep, 20 ft. incline to an old path running through the chaparral. Therefore, with Museum Special traps, it seems wise to search quite a distance for missing traps. The same, also, where traps have been sprung because one of the rats we found in the path about 15 ft. down from a sprung trap. Two of the specimens were taken in adjoining traps