Seib, R. 1980 Berteley to Sagehen Creek Field Station, Nevada (Co.) California 3 Oct pulled out. We returned to camp, ate dinner, and then checked the 61 traps at ca. 21:30. One trap above the road in the forest caught a live Peromyscus maniculatus by a hind leg. One trap set in a meadow in grass in a willow clump caught a Zapus princeps by the tail. The latter is the first recorded jumping mouse on a 70/163 field trip; the species usually hibernates towards the end of August and early Sept. Upon returning to camp, many people put up study shirts, but I jumped out promptly to view the clear night sky. Frost developed on my bag during the night. Sagehen Creek Field Station to (Hilcoot area), Plumas Co., California 4 Oct Woke early, ate breakfast and went to check traps ca. 9:00. We first checked our own traps, finding only a Peromyscus maniculatus. Then we helped Ed Hestre check four Tomahawks and several gopher hill-traps (1/2 dozen of which I had set yesterday). Only