137 Over 1932 SW slope Buddy Mtn, 4600 ft., Washington Co, Idaho. July 2, 1932 This a.m. traps contained only 2 Peromyscus manicu-latus, 1 Zapus princeps and 1 Microtus richard-soni. The Zapus was captured beneath a bank on a pebbly creek shore. The "big" Microtus was taken in a trap set in the center of a small stream on an island about 2 in. long. Another trap set in a similar place was lost, probably being carried off by one of these large mice. Last night at 8:45 p.m. I was watching the creek with a flashlight and I saw a Peromys-cus maniculatus moving along the opposite shore. It kept looking under rocks, and jump-ing right into the water, enabling it to reach rocks farther out. Finally it went under a bridge, and then jumped straight into the swift flowing current and swam across in the rapids. The creek is 10 feet wide and the mouse did not go more than 10 feet farther down on the opposite side so swiftly did it swim. This a.m. I found a Warbling Vireo's nest upon a cotton-wood tree 20 feet above the ground on the S.W. side at the end of a lower limb. It seemed to contain quite a bit of cottony fuzz on the out-side but I could not reach it for inspection. The bird was singing in the tree and the 9 was on the nest. Heard Audubon Warblers and am positive this a.m. that I heard a Virginia Warbler. Shot a Spotted