Apofer, 1938 Olewa Cr., 175 ft., 2 mi. S E Olewa, Marin Co., Calif. June 27, Last night I set 60 traps on the grass-covered SW-facing slope. This am found 3 Peromyscus m. and many spring traps. I had sceptically sought for kangaroo rats. As noted above, the northeast slopes bounding Olewa Cr. are grass-covered and - as usual for this type of country all over the Bay region - grazed by cattle. In the canyons are growths, as on the slopes across the creek (Douglas fir, etc.), the density of the growths varying with the depth, steepness (in other words degree of protection of the canyon; the differ from those on the NE-facing slopes in having more poison oak and live oak. On the NE-facing slopes of Bolinas Ridge the same dense stands are found as on Drwerer Ridge. The forests are advancing up over both ridges, young tree and other invaders (blackberry & Baccharis) noted on the tops of both ridges. Bolinas Ridge, Mr. Stewart tells me has never been cut.