80 



143i. Buteo borealis socorroensis Ridgw., Pr. Socoito Island, 

 U.S.N. Mtis,, iii., 1880, p. 220 (1881). off W. coast of 

 [Socorivl., type in U.S. Nat. Mus.] [nom. Mexico. 

 nudem.] Idem in Biol. Centr. Amer. 

 Aves iii., p. 64, 1900. 

 Socorro Island Red-tail. 



Small form ; wing o' 378-390, $418 nnn. ; 

 Similar to B. b. ciiluriis but with much 

 larger and stouter feet ; under parts more 

 uniformly pale cinnamomeus ; thighs deep 

 vinaceous cinnamon, indistinctly barred 

 with paler. 



f 143k. Buteo borealis fumosiis Nelson, Pr. Biol. Tres Marias 



Soc. Wash., xii., p. 7 (1898). [Tics Marias Islands, off W. 



Is.] coast of Mexico, 

 Tres Marias Red-tail. 



More rufous on sides of breast and belly ; 

 thighs heavily barred with brown. 



1431. Buteo borealis vcntralis Gould, P.Z.S., 1837, 

 p. 10. [Santa Cruz, Patag., type in Brit. 

 Mus.j 

 Patagonian Buzzard. 



Wing $ 363-375 mm. ; exactly like imma- 

 ture Buteo borealis borealis ; tail with 8 to 

 10 dark bars^ 



Patagonia 

 S. Chile. 



C. Tail black. 



*fl44. Buteo linealus lineatus (dmel.), S.X., 1., p. 

 268 (1788). [Long Is., A'.V.] 

 Red-shouldered Hawk. 



E. North 



America, N. to 



Canada, W. to 



edge of 



Great Plains. 



I A second example from Chile has 8 instead of lo dark bands, wider than in. 

 the type : markings on belly arc also blacker and it may be more mature. If 

 this form does not get the red tail it may be a species. 



