Cogswell 1949 Zapus trinotatus Aug. 11. Big Lagoon, Humboldt Co., Calif. Caught two in traps set behind logs on the borders of a 20 yard wide grassy avenue in a spruce-alder forest. The one prepared had its stomach full of a creamy white mushy material (mud??) mistaken entry (see Aeromyscus) Aug. 12. Caught 5 in line of 55 traps, in sites as indicated: ♂ - in pocket in edge of 15 ft. diameter thicket of blackberry, salmonberry, bracken, & sword fern at base of alder tree at edge of stream and a grassy opening. ♀ (not saved) - caught by tail. 5 yards from last, in similar habitat with a large sword fern clump in addition & furtles from the tree. ♂ (#18) - on top of old, mossy log 4 1/2 ft. above ground, under edge of salmonberry & bracken canopy fronting on a 5 ft. sedge, juncus, & fern filled strip beyond which is open grass. on ground under border of berry bush thicket in open spruce-alder forest fronting on 20 ft. grassy strip.