52 



151. 



Length q 21 ; wing loin. ; 9 '^ving 1C.5 in. ; 

 (^ above slaty-blue, below white ; tail white 

 with 10 or 11 narrow grey bars and sub- 

 terminal blackish band : 9 back and scajju- 

 lars brick red. 



Buteo erythronotus erijthronotus (Kinjjr) 

 Zool. Jnl.iii, p. 424 (1827). [Sir. of Macjellan.\ 

 Red-backed Buzzard. 



Patagonia to 

 Chile and 

 Peru, Falk- 

 land Is., 

 Argentina. 



Insular form ; (^ darker slate grey above ; 

 $ back uniform like (^ instead of red. 

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

 p. 371 [Masafuera.Y Island. 



Masafuera Buzzard. 



Length(j^21, Avingl7in. : above and throat 

 slaty-grej^ darker on head and wings ; 

 shoulder ferruginous ; rumj) and upper tail- 

 coverts Avhite ; 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). [*S'. to Chile and 

 A merica . ] Argentina . 



White-tailed Hawk. 



Cross bars on tail and lower parts finer and 

 more broken. 

 152a. Buteo albicaudatus sennetti Allen, Bull. Am. j\liddle 

 Mus. N.H. v., p. 144 (1893). {Texas.l 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 liecn described from Chile 

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

 B. pcecilogaster, B. macronifchvs, B. ater, B. pictus, B. albigula, B. [Asturina ?] 

 (tithiops et elegaths, but what the respective value of these forms is I have 

 been unable to judge. 



