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 May, 1915 A SUMMER AT FLATHEAD LAKE, MONTANA 113 characteristic mountain birds were found to take their places. Juncos became more abundant and Townsend Solitaires (Myadestes townsendi) were found about some rocky cliffs. The Richardson Grquse (Dendragapus obscurus rich- ardsoni) was perhaps the only bird that was really common. These were mostly females with broods of half-grown young. The females flew up into the trees at our approach, watching anxiously, while the young, which though able to fly showed little fear, remained nearer the ground. On Jhly 23 a trip was made to Poison, and thence down the Pend d'Oreille River to a rocky canyon about six miles below the outlet of the lake. Here the character of the country was quite different from any that we had visited previously. The region had never been visited by Mr. Silloway, so I had the good fortune to add two more birds to the Flathead Lake list that are not found in other localities of the region. The first of these was the Violet-green Swallow (Tachycineta thalassina lepida) that was breeding in considerable numbers in hollows of the limestone cliffs of the river canyon. Many of the young birds had left the nests and were perched in the tops of dead cotton- wood trees along the river bank. From these perches they sallied forth on rather uncertain wings to meet the parents as the latter came with food. Sev. eral specimens, including young of the year, were secured. With the Violet- greens I found the second new bird of the day, the Rough-winged Swallow (Stelgidopteryx serripennis). Young of this species were also about. Two specimens secured included an adult and a young bird of the year. (See fig. 42.) Hummingbirds are more abundant at Flathead Lake than I have found them elsewhere in Montana. Both the Rufous Hummingbird (Selasphorus rufus) and the Calliope Hummingbird (Stellula calliope) are common about the station at Yellow Bay. A nest of the latter species was found in one of the yellow pines in front of the station. A limb about six inches in diameter pro- jected horizontally from the tree at a height of about 20 feet. On the under side of this limb was a short dead branch about an inch in diameter. The nest was saddled on this branch under the larger limb in such a way that it was protected both from the rain and from the rays of the sun. The nest was first discovered through the actions of the parent bird, which was very belligerent in protecting her home from all birds and other animals that approached too closely. A pine squirrel had ventured into the tree and the mother hummer chased it away immediately, following it a long way through the trees and darting at it first from one side and then from the other. The nest contained half-grown young when first found. Infrequent feeding periods seem 'to be the rule with birds that feed by regurgitation. In this case the mother hummer fed her young in periods that averaged a little over half an hour apart. The feeding was in the usual hum- mingbird fashion, not differing perceptibly from the methods of the Ruby- throated and Rufous hummingbirds. The young left the nest about a week after it was found. We removed the nest later for better examination. It was a beautiful structure, built almost entirely of white cottonwood down, decorated on the outside like that of other hummingbirds with bits of green lichens. During the first half of August I was away from Yellow Bay on a trip through the Glacier National Park. On my return, August 18, I found that the fall migration had started. Ring-billed Gulls (Larus delawarensis) were much more numerous about the lake than they had been in midsummer. Soli