size towards the back of the neck; the nape and a spot behind the ear are pure white; the feathers upon the back are white, edged and striped with brown. The breast, sides, and belly are white, marked with blackish brown; the throat is white, traversed by a dark stripe; the quills and tail-feathers are mouse grey, and for the most part streaked with white. The beak is dingy yellow, tipped with black, and the eyes of a beautiful brimstone yellow. Considerable deviations from this coloration are of frequent occurrence, but the young closely resemble their parents. The length of this species is from fifteen to sixteen, and its breadth from twenty-nine to thirty-one inches; the wing measures nine and the tail seven inches. The Sparrow-hawk Owls are met with extensively throughout all the countries of the extreme north, and frequently visit the central portions of the American and European continents. Birch, fir, and pine forests afford them the retreats they prefer, and where these are found they will often ascend to a considerable height in mountain ranges. Wallengen tells us that their eyries are built upon fir and pine trees, and are formed of leaves and twigs, intermixed with dry moss; and that the six or seven round white eggs that constitute a brood are laid early in the spring. Some naturalists are of opinion that they lay but two eggs. We learn from Richardson that large numbers of these birds are killed by the fur hunters, and that they subsist principally upon insects and mice; they also devour Ptarmigans, and when in pursuit of the latter are so bold that, at the sound of the sportsman's gun, they congregate around him in the hope of securing his birds as they fall; they catch mice by waiting quietly seated near their holes until they come out, and never seize them whilst on the wing. They appear to have no fear of man, and are constantly seen around the watch-fires made by the hunters in their encampments. Such Sparrow-hawk Owls as visit Central Europe arrive about March, and depart early in the autumn; here as elsewhere they subsist principally upon mice, and frequent forests and woodland districts. The flight of this bird, unlike that of most Owls, is rapid and easy, but upon the ground it hops somewhat clumsily. THE SNOW OWL.