1431. 
+143k. 
143]. 
SO 
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 3 378-390, 2 418 nim. ; 
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., xii., p. 7 (1898). [Yves Marias 
Hiss] 
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!?. 
Co Cail black. 
#144. 
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 ; 
>. Chile: 
E. North 
America, N. to 
Canada, W. to 
edge of | 
Great Plains. 
r 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 
