*152a. 
+152b. 
+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 3 416-432, 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-johannis (Gmel.), 
S.N.,1., p. 273:(1788). [Hudson Strait and 
Newfoundland. | 
American Rough-legged Buzzard. 
Wing ¢ 405-420, 9 443-450 mm.; much 
darker and more ochraceous below normally 
than A.J. 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; 2208 
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. 
