Zapus ovarius 3 mi. W Inverness, 300 ft., Marin Co. June 25, 1938 D. Fethers took one in the marsh 1 mi. down the road from the summit of the hill - this on ocean drainage. Vegetation here is as follows, chiefly: clumps characterize it - clumps of sword fern and of some sedge; in the intermediate areas are rye grass and some other low lying grass; along the creek which drains the area are willow, alder and an occasional bay tree. Elk Valley, Marin Co., Calif. June 27, 1938 Searched this valley from one end to the other for likely areas for Zapus. This in response to skulls of these animals found in owl pellets from here by Cranston Hopkins & Clarence Smith (See Condor, 1938). The valley is heavily grazed by dairy cattle. Only at the two mouths (ocean bays) might these be found. 27 traps set in high rye grass near (50 ft.) Salicornia at the bay mouth near Margate netted nothing. The marsh at the ocean end was not examined.