This Falcon is found along the Atlantic coast from Maine to the extreme northern portion, breeding on the high rocky cliffs of Grand Menan and in various favorable situations thence northward. A few breed on Mount Tom, near the Connecticut River in Massachusetts, on Talcott Mountain in Connecticut, in Pennsylvania, and near Harper’s Ferry, in Maryland. Mr. Boardman has several times taken their eggs from the cliffs of Grand Menan, where they breed in April, or early in May. In one instance he found the nest in close proximity to that of a pair of Ravens, the two families being apparently on terms of amity or mutual tolerance. For several years two or more pairs of these birds have been known to breed regularly on Mount Tom, near Northampton. The nests were placed on the edges of precipitous rocks very early in the spring, the young having been fully grown by the last of June. Their young and their eggs have been taken year after year, yet at the last accounts they still continued to nest in that locality. Dr. W. Wood has also found this species breeding on Talcott Mountain, near Hartford. Four young were found, nearly fledged, June 1. In one instance four eggs were taken from a nest on Mount Tom, by Mr. C. W. Bennett, as early as April 19. This was in 1864. Several times since he has taken their eggs from the same eyrie, though the Hawks have at times deserted it and sought other retreats. In one year a pair was twice robbed, and, as is supposed, made a third nest, and had unfledged young as late as August. Mr. Allen states that these Hawks repair to Mount Tom very early in the spring, and carefully watch and defend their eyrie, manifesting even more alarm at this early period, when it is approached, than they evince later, when it contains eggs or young. Mr. Bennett speaks of the nest as a mere apology for one. This Hawk formerly nested on a high cliff near the house of Professor S. S. Haldeman, Columbia, Penn., who several times procured young birds which had fallen from the nest. The birds remained about this cliff ten or eleven months of the year, only disappearing during the coldest weather, and returning with the first favorable change. They bred early in spring, the young leaving the nest perhaps in May. Professor Haldeman was of the opinion that but a single pair remained, the young disappearing in the course of the season. Sir John Richardson, in his Arctic expedition in 1845, while descending the Mackenzie River, latitude 65°, noticed what he presumed to be a nest of this species, placed on the cliff of a sandstone rock. This Falcon was rare on that river.