143i. 
$143k. 
143]. 
80 
Buteo borealis socorroensis Ridgw., Pr. 
U.S.N. Mus., iii., 1880, p. 220 (1881). 
[Socorro I., type in U.S. Nat. Mus.] [nom. 
nudem.| Idem in Biol. Centr. Amer. 
Aves iii., p. 64, 1900. 
Socorro Island Red-tail. 
Small form: wing ¢ 378-390, 2 418 mm. ; 
Similar to B. b. culurus but with much 
larger and stouter feet ; under parts more 
uniformly pale cinnamomeus ; thighs deep 
vinaceous cinnamon, indistinctly barred 
with paler. 
Buteo borealis fumosus Nelson, Pr. Biol. 
Soc. Wash., xil., p. 7 (1898). [Ives Marias 
Is.] 
[Tres Marias Red-tail. 
More rufous on sides of breast and belly ; 
thighs heavily barred with brown. 
Buteo borealis ventralis Gould, P.Z.S., 1837, 
p. 10. [Santa Cruz, Patag., type in Brit. 
Mus. } 
Patagonian Buzzard. 
Wing 2 363-375 mm. ; exactly like imma- 
ture Buteo borealis borealis; tail with 8 to 
10 dark bars}. 
C. Tail black. 
#4144. 
Buteo lineatus lineatus (Gmel.), S.N., 1., p. 
268 (1788). [Long Is., N.Y.] 
Red-shouldered Hawk. 
Socorro Island, 
off W. coast of 
Mexico. 
Tres Marias 
Islands, off W. 
coast of Mexico. 
Patagonia ; 
S. Chile. 
E. North 
America, N. to 
Canada, W. to 
edge of 
Great Plains. 
1 A second example from Chile has 8 instead of 10 dark bands, wider than in 
the type: 
this form does not get the red tail it may be a species. 
markings on belly are also blacker and it may be more mature. If 
