11. Milvus leucomelas. Rafinesque, Annals of Nature, part I. p. 4. (1820.) “White, unspotted; top of head and part of the back, wings, tail, and bill, black; feet yellow. It is found in West Kentucky and Illinois; it feeds on fishes, and is therefore called Fishing Hawk. Size small, tail quite forked.” (Raf., as above.) This is a puzzler. If any such bird exists, it has escaped late researches, though we very much suspect that Rafinesque ventured a description on reports, rather oddly confounding the Forked-tailed Hawk (_Nauclerus_) and the Osprey, or Fish Hawk (_Pandion_). 12. Aquila dicronyx. Rafinesque, Atlantic Journal, p. 63. (1832.) The specimen described under this name was the same that is alluded to by Mr. Audubon in his article on the White-headed Eagle, in Orn. Biog., II. p. 163, as being kept in captivity in the suburbs of Philadelphia, and this description and its author he also alludes to. We mention this bird for the purpose of facilitating the student who may not have access to the works of Rafinesque, and for the purpose of pointing out a curious error into which Mr. Audubon and Dr. Harlan, as quoted by him, seem to have fallen, in regarding it as the White-headed or Bald Eagle (_Haliaetus leucocephalus_). It is expressly stated by Rafinesque to have been brought from “near Buenos Ayres,” and was evidently, from his description, the _Circaetus coronatus_ of South America. This name is therefore by no means to be cited as a synonyme for _Haliaetus leucocephalus_. 13. Falco doliatus. Shaw, Gen. Zool., Aves., VII. p. 77. (1809.) “Length ten inches; bill violet; cere, irides, and legs, yellow; tail marked with whitish bars more apparent beneath than above; under tail-coverts and flanks brown, with two or three round white spots on each side of the shaft; thighs ferruginous, with black shafts. Inhabits Carolina, observed by Bosc.” (Shaw, as above.) Probably the young of either _Hypotriorchis columbarius_ or _Accipiter fuscus_, but quite impossible to identify from such a meagre description. 14. Falco glaucus. Bartram, Travels, p. 290. (1791.) Barton, Fragments of the Nat. Hist. of Penna., p. 11. (1799.) “The sharp-winged hawk, of a pale sky-blue color, the top of the wings black.” (Bartram, as above.) This insufficient description has been supposed to be intended for the adult of the Marsh Hawk (_Circus hudsonius_), but Barton (as above) applies it to the _Nauclerus furcatus_. It is probably one or the other. 15. Falco subceruleus. Bartram, Travels, p. 290. (1791.) “The sharp-winged hawk, of a dark or dusky blue color.” (Bartram, as above.) Impossible to identify, from its brevity. It may be either the Mississippi Kite (_Ictinia mississippiensis_), the Fork-tailed Hawk (_Nauclerus furcatus_), or the adult Marsh Hawk (_Circus hudsonius_). 16. The following names have been given without descriptions, by the authors cited:—