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, Ibid., 1889, p. 243). 



The MEXICAN GOSHAWK (846. 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 arid grayish. L., 22-00; W., 16*00; 

 T., 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 11. Ungava s. to ceil. 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. Ossiiiing, 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 ferruginous (Licht.). FERRUGINOUS ROUGH-LEG. 

 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, 



