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 Jan., 1912 SOME BIRDS OF SOUTHWESTER. N MONTANA 27  Chordeiles virginianus sennetti. Sennett Nighthawk.. A bird secured on Cold Creek, Powell County, August 26, 1910, was referable to this subspecies. Selasphorus rufus. Rufous Hummingbird. Summer resident. Migration dates are May 30, 1910, and September 11, 1909, and August 24, 1910. Stellula calliope. Calliope Hummingbird. An adult male seen on Fish Creek, Silver Bow County, July 13, 1910. Tyrannus tyrannus. Kingbird. Summer resident of the valleys throughout the region. Nuttallornis boreal'rs. Olive-sided Flycatcher. Summer resident in the moun- tains. Migration dates are May 31, 1910, and September 5, 1909. Myiochanes richardsoni richardsoni. Western Wood Pewee. Summer resident in cottonwood groves in the valleys. Rare above 4,500 feet elevation. Empidonax hammondi. Hammond Flycatcher. Fairly common summer resi- dent in the mountains of Jefferson and Silver Bow counties. Not seen elsewhere. First noted in spring May 28, 1910. Empidonax wrighti. Wright Flycatcher. Noted commonly in migration in late May and August. 0tocoris alpestris arcticola. Pallid Horned Lark. Winter resident in the val- leys. Not common. 0tocoris alpestris leucolaema. Desert Horned Lark. Common summer resident of the valleys. Migration dates are March 3, 1910, and November 6, 1910. Pica pica budsonia. Magpie. Abundant permanent resident. throughout the region. Cyanocitta stelleri annectens. Black-headed Jay. Permanent resident in the mountains. Well distributed throughout the region but not common anywhere. Perisoreus canadens/.s capitalis. Rocky Mountain Jay. Permanent resident in the mountains. In my experience this species keeps carefully out of sight and hearing during the spring and early summer months, and is apparently quite rare. Early in August it becomes suddenly abundant, and from then until next spring is one of the commonest and tamest of mountain-birds. Corvus brachyrhynch0s hesperis. Western Crow. Summer resident. Migra- tion date March 26, 1910. This species begins nesting in late April or early May, placing the nest ten or fifleen feet above the ground, in a willow or alder bush. It is usually in the most impenetrable part of a thicket, where the nest can be seen from a distance but not approached. It is easy to locate the nest, however, as the birds are usually on guard near it, perched conspicuously in the top of the thicket. llucifraga columbiana. Clarke Nutcracker. Common permanent resident in the mountains throughout the region. Broods of young are seen commonly during May and early June. Molothrus ater ater. Cowbird. Common summer resident of the valleys. A pair secured near Anaconda in May, 1911, were referred by Dr. Bishop to the sub- species which he has recently described as J//. a. dwigkti. Xanthocephalus xanthocephalus. Yellow-headed Blackbird. Summer resident in the lower Jefferson and Deer Lodge valleys. Seen but once elsewhere in the re- gion, in the Silver Bow marshes, May 21, t911. Agelaius phoeniceus fortis. Thick-billed Red-wing. Summer resident in the Silver Bow marshes, and in suitable localities in the Jefferson and Deer Lodge val- leys. Migration date April 7, 1910. Sturnella neglecta.. Western Meadowlark. Common summer resident of the valleys. Migration date March 29, 1910. Euphagus cyanocephalus. Brewer Blackbird. Common summer resident.