85 



*f 150. Buteo erythronoiiis erythfonotus (King), Zool. 

 Jnl. iii., p. 424 (1827). {Port Famine, 

 Tier r a del Fuego.] 

 Red-backed Buzzard. 



Wing cJ 368-380, $ 405-425 mm. ; c^ above 

 light slate grey, below white, usually with 

 some fine verniculations of rufous brown on 

 abdomen ; tail white with 8 or 10 narrow 

 grey lines (except in very old birds) and 

 sub-terminal blackish band ; ? back and 

 scapulars brick red^. 



Falkland Is., 

 Tierra delFuego, 

 Patagonia, 

 Argentina (to 

 Buenos Ayres), 

 Chile. 



150a. Buteo erythronotus simonsi subsp. no v. [? 

 Challapata, Bolivia, P. O. Simons, Oct. 14th 

 1901, type in Brit. Mus., reg. no. 1902, 3, 

 13, 1600.] 

 Bolivian Red-backed Buzzard. 



Larger ; wing c^ 407, ? 455-470'-^ ; much 

 darker than B. e. erythronotus ; upper parts 

 and wings blackish slate instead of light 

 slate grey (but mantle red in ?) ; tail with 

 the cross Hues wider and blacker ; below 

 white ; cross lines on belly (when present) 

 blackish brown instead of rufous. 



Bolivia, 



N. Chile 



(Iquique), 



S. Peru (Andes) 



Ecuador 



(Andes) ? 



150b. Buteo erythronotus peruviensis subsp. nov. 

 [(J Eten, prov. Lamhayeque, Peru, P. O. 

 Simons, Sept. 21, 1899, type in Brit. Mus., 

 reg. no. 1902, 3, 13, 1603.] 

 Northern Red-backed Buzzard. 



N.W. Peru 

 (W. of Andes). 



I Males, until fully adult, often show a small amount of red on the inter- 

 scapulary region, although the grey upper and white lower plumage have been 

 acquired. Occasionally the red is so extensive as to make them resemble the 

 females, although the red in these cases is generally mottled with grey feathers. 



' The wing of the $ type measures 470 mm., and of two other females from 

 Iquique, Chile, and " High Peru," 467 and 460 mm. respectively. Other Bolivian 

 birds from prov. of Cochabamba and Oruro measure (^ (?) 407, and $ (?) 405. 

 All the Bolivian birds have the blackish upper parts, although there is a puzzling 

 variation in size. 



