B. Davis 1935. Salmon Creek, 8 mi. W Rogerson, Twin Falls Co, Idaho, May 13, and the creek are bounded in most places by cliffs of basalt, retreats for Rock Wrens, Canyon Wrens, Ravens, Prairie Falcons etc. This morning from 9-10 I took a short walk along the east bank of the reservoir south of camp, I visited the little cliffs, hoping to find sign of Marmots, but no luck. Found old dropping of past seasons, but none that were fresh. Did not see a single mammal; not even a Eutamias. However, I had fair luck with the birds. On the reservoir proper I heard and saw several Larus sp (probably californicus ); and in the rocks I succeeded in taking a pair of Rock Wrens and one ? Canyon Wren. Both species are near or actually in the nesting period as judged by the size of the gonade. A ? Canyon Wren was observed carrying what I took to be a worm in its beak. Since this seemed to indicate young birds in the nest, I did not collect him. An examination of the female indicate