_Falco labradora_, AUD. B. Am. pl. cxcvi, 1831. SP. CHAR. _Adult_ (♀ breeding plumage? 30,375, Rigolet, Labrador; Mr. Conolly). Ground-color of the plumage uniform, very deep, clear, dark plumbeous-brown, continuously uniform above; larger scapulars, secondaries, secondary coverts, and primaries more dilute along edges, however, the tint palest and broadest terminally. Tail perfectly uniform, except at the end; the tip being narrowly whitish, and about half an inch anterior to this, a transverse series of hidden irregular transverse creamy-white spots. The head (except beneath) is unvariegated. Beneath, the dark tint inclines more to blackish clove-brown, more dilute on the tibiæ; feathers edged laterally with white, this prevailing on the throat, but everywhere else far less than the dusky in amount; on the tibiæ and lower tail-coverts the white is in the form of irregular spots. Anal region unvariegated; lining of the wing with circular spots of white along the outer webs of the feathers. Under surface of primaries with plumbeous prevalent, but this crossed with mottlings of whitish, forming transverse bars; but terminally and basally they become confused or lost. Wing-formula, 2, 3–1, 4. Wing, 16.20; tail, 9.50; tarsus, 2.00–.90; middle toe, 2.05; inner, 1.50; outer, 1.50; posterior, .90. HAB. Labrador; south and westward in winter, and shores of Hudson Bay. Nos. 17,063 (♀, Quebec, W. Cooper) and 34,960 (♀, Fort Nescopec, Labrador) differ from the preceding in having ten small narrow transverse spots of reddish-white on the tail-feathers, forming as many indistinct bands; these spots touch neither the shaft nor the edge of the feather, and are almost concealed, unless the tail is spread; on the latter specimen they are very obsolete, the subterminal one only being distinct, as in the specimen selected for description. The upper tail-coverts also show faintly indicated spots, and the former specimen has the wing-coverts with very narrow irregular spots on the edge of the feathers. In this specimen there is also one feather in the scapulars which has broader white edges; it also has the white below about equal to the black in amount; the anal region, however, in all, is unvaried blackish, and the transverse oblique bands on the lower tail-coverts are a constant feature. No. 41,185 (♀, Fort Nescopec, Labrador; H. Conolly) is the darkest of all. In this the blackish plumbeous-brown is uniform over the whole surface; even the throat is unvariegated. Abdomen with a few of the feathers edged with white, and sides with a few small circular spots of the same; lower tail-coverts transversely spotted with white; tibiæ scarcely variegated, showing only narrow indistinct whitish edges. Mottling on inner webs of primaries reduced so as to be scarcely visible. Tail with the usual number (two) of irregular whitish bars,—one terminal, the other near the end. LIST OF SPECIMENS EXAMINED. National Museum, 2; Boston Society, 1. Total, 3.