67 
* 
*1128a. Heterospizias meridionalis australis Swann, Argentina. 
Auk, xxxvili., p. 359 (1921) [Laguna de 
Malima, Tucuman, Arg., type in coll. H. 
Kirke Swann]. 
Southern Red-winged Hawk. 
Larger ; wing § 415-417, 2430 mm. ; much 
darker above ; mantle and scapulars black- 
ish brown with rufous margins; below 
averaging darker, with the black bars more 
pronounced. 
Gen. XXXI. 
GERANOAETUS Kaup (1844). 
Type Spizaétus melanoleucus Vieill. 
Size much larger than Buteo ; tail proportionately 
shorter, and wings proportionately longer. 
129. 
129a. 
Geranoaetus melanoleucus melanoleucus 
(Vieill.), N. Dict. d’Hist. Nat., xxxii., p. 57 
(1819). [Paraguay—ex. Azara.] 
Paraguayan Buzzard-Eagle. 
Wing 3 497, 2541; above and chest dusky- . 
slate (oldest) to black (less mature) ; wing 
coverts grey, finely barred with blackish 
brown ; tail uniform black; below snowy 
white, outer under wing coverts and longer 
under tail coverts barred with blackish. 
Geranoaetus melanoleucus australis, subsp. 
nov. [2 Valle del Lago Blanco, Chubut, 
Patag., Aug. 12, 1901, J. Koslowsky, type 
in Brit. Mus., reg. no. 1903, 12, 8, 115.] 
Patagonian Buzzard-Eagle. 
Size similar; wing 3 480-485, 92 531-565 
mm.; above and chest as before; below 
finely barred all over with blackish (lightly 
in oldest birds and more heavily in less 
mature). 
Paraguay, S. 
Brazil (Rio 
Grande), 
Uruguay and 
Buenos Ayres. 
N.W. Argentina 
to Patagonia, 
and Straits of 
Magellan ; also 
Southern and 
Central Chile ? 
