240 NORTH AMERICAN BIRDS. 
(adventitiously ?) stained with pale brownish. Hab. Middle America, 
south to Panama, north to southern border of United States, straggling 
as far as southern Illinois. 
346. A. plagiata Scutrac. Mexican Goshawk. 
a. Adult with upper parts (including head and neck) very distinctly barred with 
grayish white. Young with thighs plain white or buffy, and lighter 
tail-bands whitish. 
A. nitida (Lata.). South American Goshawk.! 
Genus ARCHIBUTEO Brexum. (Page 223, pl. LXIX., fig. 1.) 
Species. 
a', Bill small and weak, the width of gape (from corner to corner of mouth) only 
1.35-1.45. 
Adult, normal phase: Head and neck whitish, streaked with dusky; rest 
of upper parts irregularly varied with white, grayish, and dusky (the 
lighter tints predominating), usually mixed, more or less, with rusty or 
ochraceous; rump with dusky prevailing; upper tail-coverts and basal 
portion of tail (more or less extensively—sometimes for more than half 
its length) white; terminal portion of tail crossed by a broad subter- 
minal band of grayish or dusky, and, anterior to this, usually by several 
narrower, irregular, or sometimes broken bands; quills dusky grayish, 
more or less distinctly banded with darker, their inner webs, however, 
immaculate anterior to their emargination ; lower parts chiefly whitish, 
but this spotted or otherwise varied, chiefly on breast, by dusky, the 
thighs sometimes tinged with ochraceous or rusty. Young, normal 
phase: Very much like adult, but terminal or subterminal portion of 
tail plain grayish brown, the basal portion plain whitish; lower parts 
whitish or buffy, crossed over belly, flanks, and anal region by a very 
broad belt or transverse area of uniform deep brownish or dusky. 
Downy young: Plain grayish white. Male: Length about 19.50-22.00, 
wing 15.75-16.80, tail 9.00-10.00. Female: Length about 21.50-23.50, 
wing 16.15-18.00, tail 9.00-11.00. 
6. Averaging lighter in color, with less (often with none) of ochraceous 
or rusty; rarely melanistic. Hab. Northern portions of eastern 
hemisphere. i 
A. lagopus (BRUNN.), Rough-legged Hawk.? 
W. Averaging darker in color, with more of ochraceous or rusty; fre- 
quently melanistic, some specimens being entirely deep black, with 
the exception of forehead, inner webs of quills (anterior to emar- 
ginations), and more or less distinct, usually broken, narrow bands 
across basal portion of tail, which are whitish. (Norz.—This 
1 Falco nitidus Latu., Index Orn. i. 1790, 40. Asturina nitida Bonap., Consp. i. 1850, 30. 
2 So far as evidence to date tends to show, the typical form of this species, if a distinctively American race 
be recognized, must be expunged from the list of North American birds. 
