52 



Length (^ 21 ; wing loin. ; $ wing 16.5 in. ; 

 (J above slaty-bliie, below white ; tail white 

 with 10 or 11 narrow grey bars and snb- 

 terminal blackish band ; $ back and scapu- 

 lars brick red. 



1 51 . Buteo eryihronotus erythronotus (Kinsr) Patagonia to 

 Zool . Jnl . iii, p. 424 (1 827). [Str. of Magellan.] Chile and 

 Red-backed Buzzard. Peru, Falk- 

 land Is., 

 Argentina. 



Insular form ; ^ darker slate grey above ; 

 $ back uniform likcc^ instead of red. 

 151a. Buteo erythronotus exsul Salvin, Ibis, 1875, Masafuera 

 p. 371 [Masafuera.']* Island. 



Masafuera Buzzard. 



Length(j^21, wing 17 in. ; above and throat 

 slaty-grey, darker on head and wings ; 

 shoulder ferruginous ; rumj) and upper tail- 

 coverts white ; tail silvery grey, centre 

 feathers white, with 8 or 9 silvery bars and 

 sub-terminal black band ; below white, 

 axillaries and flanks barred with blackish. 



152. Buteo albicaudatus albicaudatus (Vieill.), N. S. America, 

 Diet. d'Hist. Nat. iv, p. 477 (1816). [8. to Chile and 

 America.] Argentina. 

 White -tailed Hawk. 



Cross bars on tail and lower jmrts finer and 

 more broken. 

 152a. Buteo albicaudatus sennetti Allen, Bull. Am. Middle 

 Mus. N.H. v., p. 144 (1893). [Texas.] Texas to 



Sennett's White -tailed Hawk. S. America. 



" Notably smaller : with the upper parts, 

 particularly the head and sides of the neck, 

 darker and more slaty." 

 152b. Buteo albicaudatus exiguus, Chapm., Bull. Llanos of 



Am. Mus. N.H. xxxiv., p. 637 (1915). E.Columbia 

 [Barrigon, Col.] & E. into 



Columbian White-tailed Hawk. Venezuela. 



* The following additional forms of Buteo have been described from Chile 

 by Philippi (Arch, fiir Naturg., 1899, pp. 167-70) viz. : Buteo melanostethos, 

 B. pascilog aster, B. macronychus, B. ater, B. pictus, B. albigula, B. [Asturina ?] 

 cethiops et elegans, but what the respective value of these forms is I have 

 been unable to judge. 



