. The birds of Illinois and Wisconsin . ually two, dull white, and measure about 3 x Nidification commences late in February or in March inthis latitude. Subfamily FALCONINi^. Falcons, etc. Genus FALCO Linn. Subgenus HIEROFALCO Cuvier. 167. Falco rusticolus Gyrfalcon. Disir.: Arctic America, accidental or casual in winter to northernborder of United States. Adult: Size, large; length, over 20 inches; wing, over 13; tar-sus, feathered, at least half way down on front and sides; secondprimary, longest; first primary, shorter than third; upper plumage,mixed slaty brown and w
. The birds of Illinois and Wisconsin . ually two, dull white, and measure about 3 x Nidification commences late in February or in March inthis latitude. Subfamily FALCONINi^. Falcons, etc. Genus FALCO Linn. Subgenus HIEROFALCO Cuvier. 167. Falco rusticolus Gyrfalcon. Disir.: Arctic America, accidental or casual in winter to northernborder of United States. Adult: Size, large; length, over 20 inches; wing, over 13; tar-sus, feathered, at least half way down on front and sides; secondprimary, longest; first primary, shorter than third; upper plumage,mixed slaty brown and white, the feathers being barred and edgedwith grayish white or buffy white; under parts, white, streaked andmarked with dusky; under tail coverts, spotted and barred withdusky; tail with numerous bands. Male: Length, about 21; wing, to 1-5; tail, 8 to 9; bill,about .95; tarsus, about Female: Length, 23; wing, 15 to 17; tail, 9 to 10; bill, about i;tarsus, about 47^ Field Museum of Natural History — Zoology, Vol. Grav Gvrfalcon. Mr. W. E. Snyder records the capture of a bird of this species(Auk, Vol. 22, T905, p. 413) in Wisconsin by Mr. Fred Dean, nearSkunk Island, on Nov. 27, 1904, and states that the specimenwas examined by Prof. Robert Ridgway of the Smithsonian Institu-tion, who identified it as an immature Falco rusticolus. The above seems to be the only authentic record of the occurrenceof a Gyrfalcon in Wisconsin, although Kumlien and Hollister write(Birds of Wisconsin, 1903, p. 132): Some species of gyrfalcon hasbeen credited to the fauna of Wisconsin in an early day, a thing byno means impossible or unlikely, but there is no actual recordobtainable at present. It has not been observed in Illinois. W. W. Cooke records aspecimen taken at Manhattan, Kansas, December i, 1880 (BirdMigr. Miss. Val., 1888, p. 118). Although, so far as known, the Gray Gyrfalcon is the only onewhich has been observed within our limits, it is not unlikely that otherforms
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