O. Mammals 1942 Dipodomys April 1, Berglund Ranch, 1450 ft., 5 mi. N. Corralitos, Santa Cruz Co., California. We set out 146 Museum Special traps. 8 of these were in across a strip of Chaparral, which has been left between two Apple plantings, parallel to the contour of the hillside to hold the soil. This has been found advantageous due to the soft sandy, almost Sugary nature of the soil. This morning after a damp night with heavy dew we found 15 Dipodomys out of his trap about 15 ft. down the hill. The habitat is dominated by Baccharis, about 1 ft. tall with Lotus sp., mostly dry covering the ground. Some Broken Fern and Blackberries are also present. About 113 traps were set farther up the hillside which is generally N. facing. These were along the same type of habitat as the strip, but on its edge where it seems to change rather abruptly to grassy meadow near the top of the ridge. There is a trail at this point which follows the break in habitat. Traps were placed along the trail on the Chaparral side at about 5 pace intervals. Here we caught 2 more Dipodomys 17 and 19. Other traps were set in a meadow nearby