Lee Arnold 1937 Dipodomys merriami Warm Spring, 9 mi. E. Hmedee, Lassen Co., Calif. May 25 Caught 4 (2♂ 2♀) near farm house 4½ mi NE of Warm Spring. Among salt bush in sandy loam. May 30 Caught 2 single ♂ 1 mi. W Pabrum Pk, Washoe Co, Nevada, in the sandy silt-like soil on the west edge of Smoke Creek Desert. The Dipo was in practically the same type of habitat that ordii was in. It is a problem to me as to how two such similar species of mammals could live in the same locality and practically the same ecologic niche without apparent conflict. Could it possibly be that the food is different though found in the same place.