Hooper, 1938 Olema Cr., 175 ft., 2 mi. SE Olema, Marin Co., Calif. June 27, of Five Brooks. Up to the summit of the ridge the vegetation cover is as described before - large Douglas fir predominating. At the summit there is an abrupt break to mixed grassland - on some more wind- blown slopes and or meadowlands- and chaparral. The latter foredom- inated by far above the former at least to within 1 1/2 or 2 miles from the coast. Perhaps it continued on too the coast. The thickets were composed of Baccharis, poison oak, blackberry, wild rose, thimble berry, salmonberry, poison hemlock, sword fern; an occasional live oaks or Bishop pine dotted the area. Several lakes with no outlet, and several marshy areas were noted. I set 4 mouse traps in the chaparral which netted this morning; 1 chipmunk, 2 microtus and 1 Peromyscus maniculatus. 30 traps set in a marsh, with a sedge as the dominant plant, netted 8 Microtus 2 Peromyscus m. and 1 song sparrow. 4 Aplodontia sets yielded nothing but 1 spring trap.