"B. Richardson 934 June July 17 Quaking Aspen Meadow, 7500 ft. Siskiyou Co., California This specimen was caught in one of my mouse traps set in the meadow near the station. From all appearances it is a young specimen. Two other individuals have been carried in like manner. This kind is the predominant one about camp. They seem to be of all ages. A nest was found yesterday containing 3 young and one egg. The young are about to develop.