Nov. 1873 133 enough to see it strike its prey, though judging from analogy I think its motion at such times must be more rapid and dashing than B. Boralis, and I suspect that it also preys on larger animals and birds, although it is in its habit nearly as sluggish as its congener; its flight is much quicker and lighter and its sailings less protracted and majestic. It may at all times be readily distinguished from the former bird— its smaller size is very apparent, and while perched its bright red breast, and in the air the whitish bars on the tail are very conspicuous. It is much more shy of a horse and wagon than the other species, and will rarely allow itself to be approached in that way. When startled from its perch it flies rapidly with continued, quick powerful flaps of the wing— like the domestic pigeon—for a few hundred yards, then proceeds more leisurely with occasional sailings. Its loud whistling whe— —wo who—o-—so often imitated by the fays is the only note I have ever heard, and is not to be confounded with the cry of any other New England Hawk. It is much less common in the vicinity of Cambridge than the “red tail” but in more densely wooded sections the reverse is true “Archibutea Lagopus”—This bird is in habits almost totally unlike either of the preceding, or indeed, any other hawk with which I am acquainted. It seems to haunt exclusively the open meadow and contrary to the usually accepted idea, is much more active than either of its fellows. Indeed in general habits, it more resembles Circaus.