Sept., 1935 3 mi. W. Druness, 2 ro ft., Marin Co. Calif. June 14, passes westward. The Bishop Pine (L. muricata), mountain lilac (Ceanothus sp.), madrone (Arbutus menzesii), alder (Alnus rubra), buckeye (Aesculus californicus) association gives way to a dry hard chopparal association in which the following "major" plants were noted: Bacaris, B bracken, oak (Q. agrifolia), wild raspberry (Ribes sp?), willow (Salix), and hazlenut [the latter two especially along the creek bottom]. Along the creek a dense growth of sword grass, thistle and glass affords a splendid habitat for meadow mice (Microtus), shrews (Sorex), and jumping mice (Zapus). Other areas in the harder chopparal serve as suitable areas for wood rats (Neotoma). The primary purpose of this trip over here to Marin Co. was to secure specimens of and learn about the habitat of mountain beaver (Aplodontia), jumping mouse (Zapus) and wood rats (Neotoma). I found no definite signs of Aplodontia here, 3 mi. W. Druness, where Taylor, Camp, Grinnell and others trapped in 1913. The postmaster here told me that mountain beaver are still found in