Lee Arnold 1937 Microdipodops Warm Spring, Lassen Co., Calif. May 26 Several caught by Johnson in sand dunes SW of here and on hillside NE. They do not seem to be around the cultivated part or hard open level places May 27 One caught by myself 1/4 mile east of Warm Spring. It was in an area where there was dry dusty loam with bushes (mostly salt) about every 10 feet. In almost the same location as those caught by Johnson. May 30 None caught in my + Fitch's traplines on the eastern edge of Snake Creek Desert although we were trapping in almost (appeared to me) the same type of soil + vegetation as on the 27th.