30 
BLUE HAWK, OR HEN-HARRIER. 
FALCO CYAJVEUS. 
Plate XII. 
See Wilson’s American Ornithology , Vol. VI, p. 67, PI. 51, fig. 1, for the young, 
(under the name of Marsh-Hawk, Falco uliginosus.) 
Falco cyaneus, Linn. Syst. I, p. 126, Sp. 10. Gmel. Syst. I, p. 276, Sp. 10. Iter Poseg. 
p. 27, adolescent Male. Lath. Ind. Orn. I, p. 39, Sp. 94. Montague, in Trans. Lin. 
Soc. IX, p. 182. Meyer, Tasch. Deutschl. Fog. I. p. 145. Temm. Man. Om. I, p. 
72. Ranz. El. Zool. III, PI. 7, p. 137, Sp. 28. Brehm. Lehrh. Eur. Fog. I, p. 59. 
Seeby, III. Brit. Orn. I, p. 26, PI. 10, fig. 1, Male, fig. 2, Female. Savi, Orn. Tosc. 
I, p. 63. Nob. Cat. and Syn. Birds U. S. Sp. 22. 
Falco pygargus , Linn. Syst. I, p. 126, Sp. 11. Gmel. Syst. I, p. 277, Sp. 11, Female 
and young. 
Falco hudsonius, Linn. Syst. I, p. 128, Sp. 19. Gmel. Syst. I, p. 277, Sp. 19, young, 
American. 
Falco hohemicus , Gmel. Syst. I, p. 276, Sp. 107. Lath. Ind. p. 38, Sp. 93, adult Male. 
Falco albicans , Gmel. Syst. I, p. 276, Sp. 102. Lath. Ind. p. 38, Sp. 93, adult Male. 
Falco griseus, Gmel. Syst. I, p. 275, Sp. 100. Lath. Ind. p. 37, Sp. 86. Gerard. 
Tabl. Elem. p. 37, adolescent Male. 
» 
Falco montanus , var. B. Gmel. Syst. I, p. 278, Sp. 106. Lath. Ind. p. 48, Sp. 116. 
Falco cinercus , It. Poseg. p. 27, adolescent Male. 
Falco albicollis , Lath. Ind. p. 36, Sp. 81, adult South American Male. 
Falco bujfonii , Gmel. Syst. I, p. 277, Sp. 103, Female and young, American. 
Falco uliginosus , Gmel. Syst. I, p. 278. Lath. Ind. p. 40, Sp. 95. Sabine, Zool. 
App. to Frankl. Exp. p. 671, young American. 
Falco rubiginosus , It. Poseg. p. 29. Lath. Ind. p. 27, Sp. 56, young. 
Falco ranivorus , Daudin, Orn. II, p. 170. Lath. Ind. Suppl. p. 7, young. 
Falco europogistus , Daud. Orn. II, p. 110, adolescent Male. 
Circus europogistus , Vieillot, Ois. Am. Sept. I, p. 36, PI. 8, adolescent Male. 
Circus hudsonius , Vieill. 1 . c. I, p. 36, PI. 9, young. 
Circus uliginosus , Vieill. 1 . c. I, p. 37, Female and young. 
Circus variegatus, Vieill. 1 . c. I, p. 37, Male changing. 
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