Falco regalis. The great Gray Eagle. Bartram, Trav., p. 290. Barton, Frag. Nat. Hist. Penna., p. 11. Falco gallinarius. The Hen Hawk. Bartr. Trav., p. 290. Falco pullarius. The Chicken Hawk. Bartr. Trav., p. 290. Falco ranivorus. The Marsh Hawk. Bartr. Trav., p. 290. Falco piscatorius. The Fishing Eagle. Bartram, Trav., p. 290. Barton, Frag. Nat. Hist. Penna., p. 2, 17. Falco cæsius. The Blue Hawk. Ord., Zool. N. A., in Guthrie’s Geog, I. p. 315. The above embrace all the names and descriptions of birds of this family that have come under our notice, except those of such as are now well ascertained to inhabit other countries exclusively, and for which nearly allied species of North America have been mistaken. Of the latter we may more particularly mention the European _Falco rusticolus_ (Linn.), which is given by Fabricius as a bird of Greenland, but stated by Holboll to have been the young of _F. anatum_, and _Buteo vulgaris_ and _Hypotriorchis æsalon_, both of which are also European species, and have never been found in America to our knowledge, though there are species which are nearly related to them. The student may advantageously bear in mind that of those above, which were originally described by Pennant, in English, abstracts or compilations only, in Latin, are given by Gmelin in his edition of the Systema Natura of Linnæus. These abstracts are mostly very short, and not always to be relied on as conveying strictly the sense of the originals. Nor are they at all improved by Turton in his edition of Linnæus, in which, so far as relates to these species, he merely retranslates into English the Latin text of Gmelin without reference to Pennant. In the study of the obscure species alluded to, the original descriptions only can be consulted without risk of error. [Illustration: Plate 16 The American Lanier Falco polyagrus (_Cassin_)] FALCO POLYAGRUS.—Cassin. The American Lanier Falcon. PLATE XVI.—Male and Female.