Davis 1940. Sparks Lake, Deschutes Co., Oregon. 6). July 15. and Sparks Lake, and Tyla in Satan Creek. This creek is clear and cold, fairly swift and narrow with hard gravelly bottom where I collected. The only protection available is the moss growing from the banks over the stream. In many places the moss provides a shelter only 2 or 3" in width. Consequently, the frogs were easier to catch here. The small size of the series caught in the creek leads me to believe that the frogs make their way down stream as juveniles, and grow to adulthood in the creeks directly adjacent to the lake, where they winter in the soft deep silt, conditions seem better nearer the lake, as regards water temperature and food supply. Numerous frogs were seen up in the grass along the creek, as the water was probably too cold for them; and when they dove in at my approach, they were rather sluggish, and in many cases remained sprawled out on the surface, whereas those by the lake remained with few exceptions in the water, and were extremely active in hiding in the silt or algae. Trapline produced 1 thrumgus, too badly eaten by ants to prepare. Sibley shot 1 bat at dusk. Visited nest again, 4 eggs. Identified bird as Savannah sparrow. She did not flush until I was about 10 feet away. Sibley and I saw spotted sandpiper and 2 young, unable to fly. Sibley spotted a nest containing several young of American three-toed woodpecker. About 9' up in the smooth bole of a newly-dead lodgepole. I made 3 trips to nest