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134 THE CONDOR Vol. XVI Asyndesmus lewisi. Lewis Woodpecker. Summer resident. I have seen it only in the southern part of 'the region, in cottonwood groves along the Sun River, .just outside the mountains. Colaptes cafer collaris. Red-shafted Flicker. Common summer residen? Nests in cottonwood groves in the prairies and in the lower mountain canyons up to 5500 feet. Most of the birds are hybrids, but I have seen none in this region that were typical of the eastern species. Migration date: April 7, 1912. Two birds wintered near Choteau in the winter of 1912-13. Chordeiles virginianus henryi. Western Nighthawk. Common summer resident both in prairies and in the mountains below 6000 feet. Migration dates: June 7, 1912, August 28, 1911, and August 29, 1912. Selasphorus rufus.. Rufous Hummingbird. Summer resident. Not com- mon, but found most frequently along the foothills of the mountains. Stellula calliope. Calliope Hummingbird. Summer resident of the moun- tains. Seen rarely. I secured a nmle on Birch Creek, June 2, 1912. Tyrannus tyrannus. Kingbird. Abundant summer resident in the prai- ries. The Kingbirds in this region depart from their usual habit of nesting high, and place their nests low down in young cottonwoods or buffalo-berry bushes, particularly those along the banks of streams. The nest frequently overhangs the water. In 1912 I found ten nests near Choteau, no one of which was higher than eight feet from the ground, and one of them was less than two feet from the water of the stream it overhung. Migration dates: May 23, 1912, and August 22, 1911. The first nests are built in this region about the middle of June. The eggs take fourteen days to hatch, and the young leave the nest when fourteen or fifteen days old, so that they are first on the wing in the latter half of July. Tyrannus verticalis. Western Kingbird. Rare summer resident in the prairies. One pair nested near Choteau in 1912. Others seen on the Sun River, near Augusta. Migration dates: May 28, 1912, and August 18, 1911. Sayornis sayus. Say Phoebe. Summer resident on the prairies. Not common. Nests on buildings or on rocks on the sides of buttes. A nest of this species on a building in Choteau is said to have been occupied for the past sev- enteen years. When I first arrived in Choteau, June 2]., 1911, there were six young in this nest, that left the nest about July 4. The next year the owners returned April 28, sitting commenced on a set of seven eggs on May 23, the eggs all hatched on June 4, and the seven young were successfully reared and left the nest on June 23. A second brood was started and three eggs were laid by July 2. Nuttallornis borealis. Olive-sided Flycatcher. Summer resident in the mountains, but not common. Rare migrant on the prairies. I secured a bird near Choteau, May 26, 1912. Myiochanes richardsoni richardsoni. Western Wood Pewee. Abundant summer resident of cottonwood groves on the prairies. Migration dates: June 6, 1912, and August 13, 1911. Empidonax traini trailll. Trai]l Flycatcher. Rare summer resident. Observed on Willow Creek, northern Lewis and Clark County, June 30, 1911. A migrant bird secured near Choteau, May 24, 1912. Empidonax rainlinus. Least Flycatcher. Abundant summer resident of cottonwood groves on the prairies. Migration date: May 22, 1912. Nesting