Hooper Microtus californicus May 25, 1937 1 mi. E San Rafael, saltmarsh, Marin Co. Took 10 from 40 mouse traps set in Salicornia along slough bank in runways. Runways here completely "harrowed" the ground but most were old and "flooded out." Of the 10, 7 were caught up on high ground, but still in thick Salicornia. NW Calistoga, Sonoma Co., Calif. June 23, 1938 Took 3 in 20 traps on dry S-facing slope in dry grass with P. maricellata (about (acres)) This area a limited one - evidently had been an old seepage area; now dry. Vicinity of Stewart's Point, Sonoma Co., Calif. June 24, 1938 2 taken in 47 traps set on S W facing slope 1/4 mi. from ocean in rye grass and among Carotlums, monkey's flower, + bracken clumps. 4 taken in edge in area once swampy, now dry - 14 traps set. June 25, 1937 1/2 mi. W Ferndesse, 300 ft., Marin Co., Calif. 2 taken from 70 traps set in wet meadow among rye grass, swordfern clumps and sedges: Night cold and quite foggy - everything wet the next morning.