
288 BLUE HAWK, OR HEN-HARRIER. 
Deutsch. p. 25, sp. 20.—Meyer and Wolf, Ois. d’Allem. liv. 27, pl. 5, adult 
male; pl. 6, female.—Naumann, Vog. Deutsch. ed. 2, i. pl. 39, fig. 1, adult 
male; fig. 2, adult female; pl. 38, fig. 2, young male.—Mause Habicht, 
Missilauche, Meyer, Bochm. Abh. vi. p. 313, adult male.—Blue Hawk, Hdw. 
v. p. 33, pl. 225, adult male.—Marsh Hawk, Edw. p. 173, pl. 291.—Penn. 
Arct. Zool. sp. 105.—Lath. Syn. i. p. 90, sp. 75, var. A, female and young.— 
Ash-coloured Mountain Falcon, Lath. Syn. i. p. 94, sp. 78, var. A, adolescent 
male.—Hen-harrier, Edw. pl. 225, very old male.— Will. (Angl.) p. 172.—Alb. 
ii. pl. 5.—Hayes, Brit. Birds, pl. 1.—Lewin, Brit. Birds, i. p. 18.—Penn. 
Brit. Zool. i. sp. 58, p. 28.—Lath. Syn. i. p. 88, sp. 74; Id. Suppl. p. 22, 
adult male.—Ring-tail Hawk, Edw. iii. pl. 107.—Penn. Arct. Zool. sp. 106, 
female and young.—Ring-tail, Will. (Ang.) p. 72.—Alb. iii. pl. 3.—Hayes, 
Brit. Birds, pl. 2.—Lewin, Brit. Birds, i. pl. 18, female ; Id. pl. 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 Lanner, Lath. Syn. i. p. 87, sp. 78, adult male.—Grey 
Falcon, Penn. Brit. Zool. i. sp. 49.—Lewin, Brit. Birds, i. pl. 15.—Lath. 
Syn. i. p. 82, sp. 67, adolescent male.—New York Falcon, Penn. Arct. 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 sub- 
cceruleus, 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. 
CIRCUS CYANEUS.—BEcHSTEIN.* 
Falco (subgen. Circus) cyaneus, Bonap. Synop. p. 32.—Buteo (Circus) cyaneus ? 
var. Americanus.—Hen-harrier, Worth. Zool. ii. p. 55. 
As will be perceived upon a slight inspection of our long and 
elaborate list of synonyms, this well-known species is found 
* There still appears to be a difference of opinion regarding the 
identity of the European Circus cyaneus, or hen-harrier, and the North 
American Falco uliginosus of Wilson. 
Wilson was of opinion that they were the same, but only judged 
from descriptions, being unable to obtain specimens from Britain for 
comparison. The Prince of Musignano thinks they are the same, and 
repeats the“asseveration in his latest correspondence, but still perceives 
some differences of habit and in the changes of plumage that would 
weigh farif something more decided could be established. Mr Swainson 
and Dr Richardson describe it with a query, under the name of 
C. Americanus, and give numerous measurements of specimens, which 
neither agree with each other, or generally with those of Britain, 
Though I cannot at present fix on characters, I strongly suspect that 
