Paraguay, Bolivia, and Suuthern Brazil. 331 



Inmi. (J . Irides aud cere lemon-yellow, orljits greener ; 

 hill slate-coloured, darker at tip ; legs and toes lemon- 

 yellow. 



These birds agree with tlie remarks made by Mr. Chnbb 

 on the plumages of this Hawk, except that the adult female 

 shot on Aug. 7th has five bars to the tail and an indication 

 of a sixth. 



Commonly observed throughout the river expedition, 

 sitting both on the trees and on the banks. 



178. ASTURINA NITIDA. 



Asturina nitida Sharpe, Cat. B. i. p. 203. 



a. S ad. Puerto Maria, Paraguay. Oct 24, 1909. 



Irides brown, orbits fleshy, cere and gape lemon-yellow ; 

 bill black, inclining to slate-coloured at base ; legs and toes 

 dull lemon-coloured, nails black. 



179. BUTEO SWAINSONI. 



Buteo ohsoletus (nee Gm.), Sharpe, Cat. B. i. p. 181. 



Buteo swainsoni Arg. Orn. ii. p. 59; Sharj)e, Hand-1. i. 

 p. 256. 



a. ^ young. Luiconia, Ajo. Nov. 14, 1908. 



/;. c? young. Los Ynglases, Ajo. Dec. 9, 1909. 



One of these two males is more thickly marked on the 

 breast than the other. 



180. Urubitinga zonura. 



Uruhitinga zonura Sharpe, Cat. B. i. p. 213. 

 Urubitinga urubitinga Sharpe, Hand-l. i. p. 258. 



a. ? . Tayru, Paraguay. Aug. 5, 1909. 



b. ? . Villa Pilar, Paraguay. Aug. 6, 1909. 



181. BUSARELLUS NIGRICOLLIS. 



Busarellus nig?-icullis Sharpe, Cat. B. i. p. 211. 



a. ? . Kiacho Anclio, N. Argentine. Aug. 1, 1909. 



b. ? . Near Villa Franca, Paraguay, Nov. 6, 1909. 

 Irides brown ; bill black ; orbits and gape slate-coloured ; 



legs and toes bluish white. 



The female from Riacho Audio is obviously younger than 

 the other, as it has the chest-feathers broadly centred with 



