464 Field Museum of Natural History — Zoology, Vol. IX. 



inore or less streaks, the concealed portion of the feathers being white; 

 under parts, more or less white with various markings. The tail, 

 instead of being rufous, is thickly mottled with gray, dusky, and white, 

 and tipped with whitish, at times showing a tinge of rufous, but 

 often without. The immature bird has the tail banded with grayish 

 and dusky brown. 



Adult male: Length, about ig; wing, about 15.50. 



Adult female: Length, about 20.50; wing, about 16.50. 



Harlan's Hawk is of casual or accidental occurrence in Illinois. 

 Mr. Chas. K. Worthen shot an adult male bird of this species near 

 Warsaw, 111., March 18, 1879 (Ridgway, Bull. Nutt. Orn. Club, Vol. 

 V, 1880, p. 31). Mr. Worthen records a second specimen, which had 

 been caught in a trap by a farmer near Warsaw, January 19, 1899 

 (The Osprey, Vol. Ill, 1899, p. 94). A third specimen was secured 

 by Mr. Frank M. Woodruff, who purchased it from a hunter who 

 had shot it near Calumet Lake, Chicago, Oct. i, 1895 (Birds of the 

 Chicago Area, 1907, p. 95). 



It does not appear to have been observed in Wisconsin. 



159. Buteo lineatus (Gmel.). 



Red-shouldered Hawk. 



Distr.: Throughout eastern North America, north to Manitoba, 

 breeding throughout its range; south to the Gulf states, Texas, and 

 Mexico. 



Adult: 'Four outer primaries notched, a rufous brown patch on 

 the ''shoulder'' formed by the lesser wing coverts; upper plumage, 

 dark brown, mixed with rufous and showing more or less white on the 

 wing coverts; primaries, dark brown, with large broken bars of white 

 edged with pale rufous; most of under parts, rufous brown, with 

 numerous pale bars; the shafts of the feathers, dark, forming narrow, 

 longitudinal, dusky streaks; tail, slaty brown, banded with white; 

 feet and cere, greenish yellow. 



Immature: Above, dark brown, mixed with rufous and dull white; 

 under parts, buffy white, streaked with dark brown; thighs, pale ru- 

 fous, spotted with brown; terminal portion of primaries, dark brown, 

 the basal poi'tion, pale rufous shading into white on the inner webs, 

 and with imperfect bars of dark brown; tail, with rather faint bars 

 of slaty brown, dark brown and pale rufous; the inner webs of most 

 of the feathers marked with more or less white; rufous "shoulder 

 patch" of the adult broken and not pronounced, but usually more or 

 less indicated. 



