
276 WHITE-TAILED HAWK. 
WHITE-TAILED HAWK. (falco dispar.) — 
PLATE XI.—Fic. 1. 
Falco dispar, Temm. et Laug. Pl. Col. 319, young female.—Wob. App. to Synop- 
sis of N. A. Birds in Ann. Lyc. New York, p. 435.—Milvus (now Elanoides) 
leucurus, Veil. (Alcon blanco, D’Azara), Nouv. Dict. @ Hist. Nat. xx. p. 556. 
—Falco melanopterus, WVob. Jour. Ac. Ph. v. p. 28.—Id. Cat. Birds U.S. sp. 
16, in Contr. Macl. Lyc. i. p. 11.—Id. Synopsis of N. A. Birds, sp. 16, in 
Con. Lyc. N. Y.—Le Faucon Blane, Sonnini’s d Azara, iii. p. 96, sp. 36.—My 
Collection. 
ELANUS DISPAR.—JARDINE. 
Falco dispar, Bonap. Synop. App. p. 435. 
Tus beautiful hawk, which we recently discovered to be an 
inhabitant of North America, is so strikingly similar to the 
black-winged hawk (falco melanopterus *) of the old conti- 
nent, that we have hitherto considered them as identical, con- 
trary to the opinion of Vieillot, whose authority, it is true, 
could in this case be of little weight, as he had not seen the 
species, but, like many others, had merely given it a name ; 
his sole knowledge of it being derived from the work of 
D’Azara. We have now yielded only to the decision of T'em- 
minck (who has lately introduced the young into his Planches 
Colorées), but not without much reluctance, especially as that 
distinguished ornithologist has evidently not been at the trouble 
of comparing the two species, otherwise he would certainly 
not have omitted noticing their affinities and differential char- 
acters, since, in the history of species so closely allied as these 
* Falco melanopterus, Daud. Orn. ii. p. 152, sp. 124 ; Lath. Ind. Suppl. 
p- 6, sp. 16. Falco Sonninensis, Lath. Ind. Suppl. p. 12, sp. 38. Elanus 
cesius, Savigny, Ors. d’Egyp. p. 98, pl. 2,f. 2; Vieill. Vouv. Dict. d Hist. 
Nat. viii. p. 240 (now Elanoides). ELlanus melanopterus, Leach, Zool. Misc. 
iii. p. 4, pl. 122 ; Vigors, Descr. Austral. Birds, in Tr. Lin. Soe. xv. p. 185. 
Le Blac, Le Vaillant, Ois. d’Afr. i. p. 147, pl. 86 male, 37 young male. 
Black-winged falcon, Lath. Syn. Suppl. i. p. 28, sp. 28. Sonnini’s falcon, 
Lath. Syn. Suppl. ii. p. 52, sp. 59. 
The inspection of original drawings, in a collection that Mr Gray, of 
the British Museum, was kind enough to show me lately in London, 
has enabled me to add to these already numerous synonyms, Falco azil- 
laris, Lath. Ind. Suppl. (Circus axillaris, Vieill. !), from New Holland. 
