*1522> 
7152b. 
+153. 
88 
tarsi buffish-white, barred with brown; 
much variation occurs, some birds being 
much darker, almost uniform below. 
Triorchis lagopus pallidus (Menzb.), Orn. 
Turkest., i., p. 163 (1888). [Szberia, Tur- 
kestan, etc.) 
Siberian Rough-legged Buzzard. 
Wing ¢ 416-432, 2 436-450 mm.; much 
paler; plumage above with broad white 
margins ; streaks on throat and breast and 
thighs much narrower and paler; upper 
tail-coverts white with a central streak 
of brown. 
Triorchis lagopus sancti-johanmis (Gmel.), 
S.N., i., p. 273 (1788). [Hudson Strait and 
Newfoundland.] 
American Rough-legged Buzzard. 
Wing ¢ 405-420, 2 443-450 mm.; much 
darker and more ochraceous below normally 
than A. /. lagopus and varying in melanistic 
examples to nearly uniform black. 
Triorchis ferrugineus (Licht.), Abh. K. 
Akad. Wiss. Berl. (Phys. K1.), 1838, p. 428 
(1839). [Near Monterey, Cal.] 
Ferruginous Rough-leg. 
Wing ¢ 424, 2 430-460 mm.; plumage 
above blackish with chestnut margins, 
especially on wing coverts ; head streaked 
with black and white ; tail silvery ashy, 
tinged with rufous, the base and tip white ; 
below white, more or less washed with 
rufous, with rufous brown shaft lines on 
chest and arrow heads or bars on flanks ; 
thighs bright chestnut barred with black. 
Siberia, E. of 
Obi Valley, 
Kamtschatka, 
Ussuri; in 
winter to 
Turkestan, 
Black Sea, 
Caspian and 
China. 
N. America, 
N. of Mexico, 
breeding N. of 
U.S. ; migrat- 
ing S. in winter. 
W. North 
America, S. to 
California : 
in winter to 
Lower Califor- 
nia and N. 
Mexico. 
