. The birds of Illinois and Wisconsin . dthree specimens taken in Wisconsin, two at Lake Koshkonong onNovember 10, 1893, and another in October, 1894. Nelson (BirdsN. E. 111., 1876, p. 151) gives it as having been observed by Dr. Coueson the Illinois side of the Mississippi River near Rock Island, in theautumn of 1876, and undoubtedly refers to the single specimenobserved by Dr. Coues mentioned in his note in Bull. Nutt. Orn. Club,1877, previously mentioned. W. W. Cooke records a specimentaken by Mr. Bolmer at Paris, 111., on January 19, 1886, and statesthat it has been found nesting at Vermil
. The birds of Illinois and Wisconsin . dthree specimens taken in Wisconsin, two at Lake Koshkonong onNovember 10, 1893, and another in October, 1894. Nelson (BirdsN. E. 111., 1876, p. 151) gives it as having been observed by Dr. Coueson the Illinois side of the Mississippi River near Rock Island, in theautumn of 1876, and undoubtedly refers to the single specimenobserved by Dr. Coues mentioned in his note in Bull. Nutt. Orn. Club,1877, previously mentioned. W. W. Cooke records a specimentaken by Mr. Bolmer at Paris, 111., on January 19, 1886, and statesthat it has been found nesting at Vermillion, Dakota, and Grinnell,Iowa. (Bird Migr. , 1888, p. 117.) 164. Archibuteo lagopus sancti-johannis (Gmel.).American Rough-legged Hawk. Distr.: North America, from Gulf states northward; breeds chieflynorth of the United States. Light phase, adult: Four outer primaries, notched; entire front oftarsus, thickly feathered; upper plumage, dark brown, the feathersmargined with tawny buff and buffy white; primaries, grayish American Rough-lejged Hawk.(Dark phase.) 472 Field Museum of Natural History — Zoology, Vol. IX. the basal portion of inner webs white; upper portion of tail, whitish,lower portion, dark, with whitish bars; under parts, white or buff,more or less streaked and spotted; belly, heavily marked with black-ish and buff, forming an irregular dark band; thighs, tawny orbrownish buff, more or less barred with black, but not ferruginous ordeep rufous brown, as in A. ferrugineus. Immature: Resembles the normal adult, but the terminal portionof tail not barred; the under parts more heavily marked and theblackish band on the belly broader and more perfect. Dark phase, adult and immature: General plumage, blackish, ordark brown, with the exception of forehead and inner webs of anteriorportion of primaries; primaries and tail, with pale bars. Various intermediate plumages, too varied to be described, occurbetween the light and dark forms. Adult male: Length,
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