Peromyscus maniculatus. June 9 Caught one mouse near some down logs. June 12 Sand Flat, 6800ft., Mt. Shasta, Siskiyou Co., Calif. - In 5 traps caught 3 mice. Last night I saw one poke its head out of a rock cairn along the road. Caught two there, and one other a short way away. June 13 Had 2 traps in the tent to protect my supplies, + set the other 3 out, one near the road in rocks, one near a log, the other by an old stump. Within half an hour heard a snap, had a mouse by the road. This a.m., had one in my tent. It was in both traps. Apparently got tail + hind foot in one, and while trying to get away got into the other. The second smashed its skull. Saved the first (506); the other, in tent, weighed 19.2gm, measured 140-51-20-18. It had previously lost part of its tail. It was a male. June 20 N. Santiam River at Marion Creek, 2400ft., Linn Co., Oregon Set 2 traps on an old upturned stump with many large holes around its base. At 8:55pm (standard time), about 3h. after dark, caught a mouse (#227), and reset trap. At 9:20pm, had another in the same trap (#228). Shortly after I went to bed, I heard another snap (ca. 10:00pm) and in morning found a third mouse in the same trap. This one was another young ♀, 167-83-20-18 , 20.0gm. Also got a mouse about 12 ft. away in Acer at the base of D. Fri. This was a ♂, 163-79-21-17, 14.6gm. the second trap at the stump was not looked.