lupen, 1935 San Joaquin R., 3 mi. NE. Vernalis, San Joaquin Co., Calif. October 19, in August. The animals must have remained in the trees during the flood time, when the ground was covered with water. This morning D. found two good adults in my traps. Both were taken from traps set up in the branches of the willow-trees. They bear numbers 149 + 150 (mammas enlarged). The mouse traps were undisturbed. One wonders why the Peromyscus maniculatus are not plentiful here. They are 'ground-dwellers' and could easily be drowned out by the high water. However, so are gophers, yet one gopher system was found out approx. 3/8 mi. from the higher flood bank, in a region which was under water for a depth of at least three feet. The animal must have migrated this distance since March or April when the water was so high. Berkeley, Alameda Co., Calif. October 20, Yesterday at 1:30 P.M. we broke camp, packed the truck so as to be ready to leave when we wished, then visited several wood rat nests. We thought perhaps other specimens could be secured if