32 
BLUE-HAWK, OR HEN-HARRIER. 
Ring-tail , Will. (Ang.) p. 72. Alb. Ill, PL 3. Hayes, Brit. Birds , PI. 2. Lewin, 
Brit. Birds, I, PI. 18, Female. Id. PI. 2, fig. 4, the egg. Penn. Brit. Zool. Sp. 59. 
Lath. Syn. I, p. 89, Sp. 75. Id. Suppl. p. 22, Female and young. 
White-rumped Bay Falcon , Lath. Syn. p. 54, Sp. 34, Var. B. young. 
Hudson's Bay Ring-tail , Lath. Syn. I, p. 91, Sp. 76, young. 
White Lamer , Lath. Syn. I, p. 87, Sp. 73, adult Male. 
Gray Falcon , Penn. Brit. Zool. I, Sp. 49. Lewin, Brit. Birds , I, PI. 15. Lath. Syn. I, 
p. 82, Sp. 67, adolescent Male. 
New-York Falcon , Penn. JLrct. Zool. II, p. 209, adolescent Male. 
Ranivorous Falcon , Lath. Syn. Suppl. Female and young. White-necked Falcon , Lath. 
Syn. Suppl. p. 30, Sp. 101, adult Male, South American. 
Cayenne Ring-tail , Lath. Syn. I, p. 91, Sp. 76, Var. A. young. 
Falco glaucus, the sharp-winged hawk, of a pale sky-blue colour , the tip of the wings 
black. Bartr. Trav. p. 290, adult Male. 
Falco subcceruleus, the sharp-winged hawk, of a dark or dusky blue colour , Bartr. 
Trav. p. 290, adolescent Male. 
Falco ranivorus, the Marsh-hawk, Bartr. Trav. p. 290, young. 
Philadelphia Museum. 
My Collection. 
As will be perceived upon a slight inspection of our long and 
elaborate list of synonyms, this well-known species is found in 
almost every part of the globe; and not only does it seem to have 
been considered every where distinct, but nearly every different 
appearance which it assumes during its progress through the 
various and extraordinary changes that its plumage undergoes 
according to sex and age, has in each country given rise to a 
nominal species. At the same time however that names were thus 
inconsiderately multiplied for one bird, two, really distinct, were 
always confounded together. Analogous in their changes, similar 
in form and plumage, it was reserved for the acute and ingenious 
Montague, to point out the difference, and establish the two species 
by permanent characters. The new one was called by him Falco 
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