Mar. 22, The Peromyscus were relatively less abundant, & new species, Perognathus, was trapped - in comparison with catch of Feb. 16. However, perhaps the pocket mice were not out of hibernation in February. About 70 "standard" mouse traps were set out as a line separate from the live trap line. These guillotine traps were placed on an average of 15 paces apart along the top of and sweet brow of a hill. The ground was rocky; soil layer very thin - probably not over 4 inches on the average. Vegetation present: chiefly annualse (grasses, [Eschscholtzia]); scattered clumps of Artemesia ; California Bay. (Umbellularia) and canyon live oak (Quercus chrysolepis) and poison oak (Rhus diversiloba) in side canyons. Mammal sign was abundant. This morning I found the following animals in my traps: 13 Peromyscus m. gambelli, 3 Peromyscus t. gilberti, 1 Microtus c. californicus, 8 Dipodomys heermanni and 1 ? horned lark (Otocoris alpestris)