478 BIRDS OF ILLINOIS. 



1. A. lagopus sanoti-johannis. Bill comparatively narrow at the base and compressed 

 tiTmiually. Tarsus not more than 3 inches. Breast never immaculate white; no 

 rufous on upper parts or tibiEB. Adult: Tail with several bands. Light phase 

 with white prevailinc. this much broken however, by dusky spottinR. the spota 

 rather coalesced on pectoral region. Melanistic phase sometimes uniform coal- 

 black (more commonly dark brownish), with white lores, white under side of 

 Quills, and licht (grayish or white) narrow bands on tail. Young: Terminal halt 

 (or less) ot tail grayish brown, without bars, basal portion white (usually unvaried). 

 Light phase grayish brown above, with dusky streaks and fulvous or buffy edg- 

 ings; beneath ochraccous or buffy whitish, the belly and flanks usually dark 

 brownish; breast streaked with brown. Melanistic specimens blackish brown, 

 eometimes nearly uniform, but usu.iUy more or less streaked with fulvous edg 

 Ings to the feathers. Male: Wing, 15.75-16.80; tail, 9.00-10.00; tarsus, 2.75-2.80; 

 Female: Wing, 16.15-18. CO; tail,9.00-11.00; tarsus, 2.80-3.00. 



. A. ferruginens. Bill very broad, and somewhat depressed, at the base, the gape 

 almost "flssirostral." Tarsus more than 3 inches. Breast usually immaculate 

 white (rufous in melanistic specimens); upper parts and tibiae rich rufous in 

 adults. Adult, light phase: Upper piirts .and tibias fine rufous, the former with 

 tear-shaped stripes, or spots, the latter with transverse bars of dusky. Tail white 

 washed with ashy, and more or less stained with light rufous. Melanistic phase: 

 Prevailing color deep chocolate-brown, more or less varied with rufous; tail as 

 in the hght phase. Young, light phase: Above grayish brown, the feathers edged 

 with ochraceous or fulvous; tibife white, usually more or less barred with dusky; 

 tail white only on basal portion and on inner webs, the terminal hall (or more) 

 grayish brown, usually with several more or less distinct darker bars. Male: 

 Wing, 15.90-17.00; tail, 9.50-10.50; tarsus, 3.10-3.45. Female: Wing. 17.00-18.80; tail, 

 10.50-11.00; tarsus, 3.20-3.40, 



Archibuteo lagopus sancti-johannis (Gmel.) 



AMERICAN EOUGH-LEGGED HAWK. 

 Popular synonyms. Black Kough-leg; Black Hawk. 



Falco snnrli-jnhannis Gmel. S. N. i. 1788. 273.— AUD. Orn. Biog. ii, 1831. 3S1. 

 Buteo sancti-johannis Cuv. 1S17.— NuTT. Man. i.l832, 98. 

 Arehibuteo sancti-johannis Gbat, 1849.— Cass, in Baird's B. N. Am. 1858. 33.— Baied, 



Cat. N. Am. B. 1859. No. 31. 

 Arehibuteo lagopus var. sanrti-johannis CouES, Key. 1872, 218; Check List, 1874. No. 



356; B. N. W. 1874,361.— B. B. & K. Hist. N. Am. B. iii, 1874. 304. 

 Arehibuteo lagopus sancti-johannis KiDGW. Nom. N. Am. B. 1881, No. 447.— CouES, 

 2d Check List,1882,No. 525. 

 Falco lagopus Wixs. Am. Orn. iv, 1821, pi. 33, fig. 1 (nee BKiiNN).—AuD.B. Am. 1831, pis. 

 166,422; Orn. Biog. ii. 1831. 277. 

 Buteo lagopus Sw. & BiCH. F. B.-A. ii, 1831, 52, pi. 28.— Nhtt. Man. 18.32,97.-AuD. B. Am. 



i, 1840, 46. pi. U. 

 Arehibuteo lagopus Bp. 1850.— Cass, in Baird's B. N. Am. 1858,32.- Baied, Cat. N, Am. 

 B. 1859, No. 30. 

 Falco niger WiLS. Am. Orn. i, 1812, pi. 53, figs. 1,2. 

 Hab. Whole of North America, breeding in arctic and subarctic districts. (The true 

 A. lagopus occurs in western Alaska.) 



o. Normal plumage. 

 Sp. Chae. Adult male (No. 4:5,073. Fort Kesolution, Juno: J. Lockhart). Ground 

 color of the upper parts dull umber-cinereous, this more rufous on the shoulders, and 

 dull white on nape, scapulars, inner secondaries, and upper tail-coverts ; rump entirely 

 black, feathers bordered with whitish. All the feathers above with central oblong or 

 irregular spots of black, this color predominating on top of head, and forming trans- 

 verse bands across the wing-coverts and secondaries; upper tail-coverts pure white 



