Different races of _Pedioecetes phasianellus_, the well-known Prairie Chicken, occupy America as far southwards as North California, New Mexico, Wisconsin, and Illinois. Both male and female shew black, red-brown, and yellowish tints above, with white streaks on the scapulars and spots on the wings, the lower surface being white with dusky markings. The short tail, with two elongated, but truncated median rectrices, gives it the name of Sharp-tailed Grouse. This shy denizen of the woods and prairies extends almost to the Arctic barren grounds in spring, that season being remarkable for the conduct of both sexes, which meet to hold regular dances on elevated spots, aptly compared to the hills of Ruffs. No doubt the cocks are the chief performers, but they are said to be monogamous, though their actions resemble those of their polygamous allies. The flight is strong and rapid, with alternate periods of flapping and sailing; the note is a triple whistle or a "cack-cack-cack." The food includes shoots of plants, grass, berries, and insects, the last-named being the chief diet of the young, as in the case of many other American Grouse. About fourteen eggs are deposited in a cavity scraped amidst rank herbage, and but slightly lined; their colour is brownish with darker spots, or occasionally creamy with marks of red. _Centrocercus urophasianus_, the Sage-Cock of the Western United States and the adjoining portions of British America, has the upper parts mottled with black, grey-brown, rufous, and buff, the lower parts black, relieved by a white chest. The tail is long and wedge-shaped, with attenuated feathers; the sides of the neck and lower throat possess stiff spiny plumage, and the former bare orange air-sacs, as in the species next to be mentioned. The female lacks the black spots on the white throat. This bird, the largest of the New World Tetraoninae, is generally unsuspicious, and runs ahead of the traveller uttering cackling or clucking notes; when hard pressed it rises with fluttering action, and flies off rapidly to a considerable distance. The food consists chiefly of "sage-brush" (_Artemisia tridentata_), but other leaves and flowers, seeds, berries, grain, and insects vary the fare. The habits at the mating-time resemble those of _Dendragapus_ and {235}_Tympanuchus_, while the eggs, from seven to seventeen in number, may be found placed in an excavation of the bare soil, or resting on a slight lining; they are drab or olive in colour, with roundish brown spots. What seems to be the ground colour is easily rubbed off before incubation commences, a fact noticeable in other Galline birds and Plovers. The Sage-Grouse reaches a considerable elevation, as does the sage-brush, which gives its name to the bird.