300 HAWKS, EAGLES AND KITES 
the scream of the Red-shouldered Hawk, but is finer and more pro- 
longed (Auk, 1890, p. 56; see also Scott, [bid., 1889, p. 243). 
The Mexican Gosuawk (346. Asturina plagiata) is a tropical species 
which reaches the southwestern border of the United States. An individual 
seen by Mr. Robert Ridgway in southern Illinois, August 19, 1871, is the only 
known instance of its occurrence east of the Mississippi. 
347a. Archibuteo lagopus sancti-johannis (Gmel.). RouGH-LEGGED 
Hawk. <Ad., light phase Upperparts fuscous-brown, margined with 
whitish ‘and ochraceous-buff; inner vanes of the primaries white at the 
base; basal half of the tail white or buffy, end with two or three grayish 
or whitish bars; underparts varying from white to ochraceous-buff, streaked 
and spotted with black, these marks uniting to form a broken band across 
the belly; front of tarsi entirely feathered. Im., normal phase.—Similar to 
the ad., but the end half of the tail without bars except for the white tip, 
the underparts more heavily marked with black, the belly band being broad 
and continuous. Black phase-—Plumage more or less entirely black, the 
primaries and tail barred with whitish and grayish. L., 22°00; W., 16°00; 
-» 9°50. 
Remarks.—Its feathered tarsi and heavily marked underparts character- 
ize this species. 
Range.—N. A. n. of Mex. Breeds in Hudsonian zone from the Aleutian 
Islands, nw. Alaska, Arctic coast, and n. Ungava s. to cen. B. C., s. Mack- 
enzie, s. Ungava, and N. F.; winters from Ore., Colo., Minn., and n. bound- 
ary of w. U.S. s. to cen. Calif., s. N. M., Tex., La., and N. C. 
Washington, rare and irregular W. V. Ossining, casual. Cambridge, 
T. V., not uncommon, Nov.—Dec.; Mch.-Apl. N. Ohio, not common W. V., 
Nov. 20—Apl. 3. Glen Ellyn, quite common W. V., Oct. 12—Apl. 30. SE. 
Minn., W. V., Oct. 15—Mch. 
Nest, on rocky ledges or in trees. Eggs, 2-5, dull white, sometimes 
unmarked, but generally more or less spotted, blotched, or scrawled with 
cinnamon-brown or chocolate, 2°20 x 1°75. Date, Ft. Chimo, Lab., May 24. 
“The Rough-leg is one of the most nocturnal of our Hawks, and 
may be seen in the fading twilight watching from some low perch or 
beating with measured, noiseless flight over its hunting-ground. It 
follows two very different methods in securing its food—one by sitting 
on some stub or low tree and watching the ground for the appearance 
of its prey, as the Red-tail does; the other by beating back and forth 
just above the tops of the grass or bushes and dropping upon its vic- 
tim, after the manner of the Marsh Hawk. . . . 
“The flight of the Rough-leg is seldom rapid and often appears 
labored, and when on the wing this Hawk resembles the Osprey more 
than any other bird of prey. . . . 
“Of 49 stomachs examined, 40 contained mice; 5, other mammals; 
1, lizards; 1, insects; and 4 were empty” (Fisher). 
348. Archibuteo ferrugineus (Lichi.). FrrRuciInous RovucH-uEa. 
Ad., light phase.—Upperparts mostly rufous, the centers of the feathers fus- 
cous; tail grayish white, margined with rufous; legs rufous, barred with 
black; rest of underparts white, more or less barred with rufous on the sides 
and belly; tarsi fully feathered in front. Im.—Upperparts dark grayish 
brown, slightly varied with ochraceous-buff; tail silvery grayish brown, with- 
out bars, the base white; underparts white, lightly spotted and streaked with 
fuscous. Dark phase-—Dark fuscous-brown, more or less varied with rufous; 
primaries and tail as in the ad. L., 23°00; W., 17°00; T., 10°50, 
