_Young male_ (35,060, Rio de Coahuyana, W. Mexico, October; J. Xantus). Above, from bill to upper tail-coverts, dark bistre-brown, almost black; feathers of the head and neck edged laterally with pinkish-ochraceous, or sulphuret of manganese color; scapulars with nearly whole outer webs of this color, they being blackish only along edges and at ends; middle wing-coverts spotted with the same. Secondaries and primaries faintly tipped with whitish; secondaries with indications of darker bands, and outer webs of primaries with still more obscure ones; upper tail-coverts white, with sagittate specks of black, one or two on each. Tail umber-brown (considerably lighter than the wings), tipped with pinkish-ash (this passing terminally into dull white), and crossed with six or seven bands of black (these becoming gradually, but very considerably, narrower toward the base). Beneath white, with vinaceous tinge (this deepest laterally); breast, abdomen, and sides with large tear-shaped or cuneate spots of black; tibiæ with numerous transverse bars of the same. _Young female._ Similar to last, but the brown lighter, and more approaching umber. HAB. Middle America (from coast to coast), from Costa Rica and Guatemala to southern border of United States. Arizona, breeding (BENDIRE). Southern Illinois (Richland Co.) June (RIDGWAY). LIST OF SPECIMENS EXAMINED. National Museum, 13; Philadelphia Academy, 3; Boston Society, 5; Cab. G. N. Lawrence, 1; R. Ridgway, 2. Total, 24. _Measurements._ +----+-----------+-----------+---------+---------+-----------+----------+ |Sex.| Wing. | Tail. | Culmen. | Tarsus. |Middle Toe.|Specimens.| +----+-----------+-----------+---------+---------+-----------+----------+ | ♂ | 9.80–11.50| 7.20–7.80| .85–.95|2.50–2.70| 1.55–1.70| 7 | +----+-----------+-----------+---------+---------+-----------+----------+ | ♀ | 9.50–11.30| 6.70–8.00| .80–1.00|2.75–2.70| 1.40–1.75| 4 | +----+-----------+-----------+---------+---------+-----------+----------+ | ⚪? |10.00–11.70| 6.80–8.00| .90–.95|2.65–2.80| 1.50–1.65| 4 | +----+-----------+-----------+---------+---------+-----------+----------+ HABITS. This is a Mexican and Central American Hawk, which occasionally crosses the borders of the United States, having been seen by Mr. Ridgway in Southern Illinois, and found breeding, by Captain Bendire, in Arizona, near Tucson. It has been found in the State of New Leon, one of the most northern provinces of Mexico, by Lieutenant Couch, who has, however, supplied no notes as to any peculiarities in its habits. It was said to breed in the tops of lofty trees, and to have eggs of a greenish-white, resembling those of _Astur atricapillus_. In Central America it is said by Salvin to be abundant in the hot country on both coast regions of the Republic of Guatemala, but it is not found in the temperate regions. Its food consists of lizards, and its flesh is in consequence very rank.