334 Mr. C. H. 13. Grant on Birds collected ia Argentina, 



The nest is placcnl either in the fork of a large tree or on 

 the ground under a tuft of grass or a thistle, &c. ; when in 

 sueh a situation it is merely lined with a little wool or 

 rubbish, but in trees the nest is composed of sticks and lined 

 with grass or wool. Three eggs appears to be the complete 

 clutch. 



Ten eggs were brought home, collected between Nov. 4 

 and Dec. 28 ; they vary considerably in the arrangement of 

 the markings^ some being marked evenly all over and others 

 having the bulk of the markings at the obtuse end. 



190. MiLVAGO CHIMACHIMA. 



Ibyder chimachima Sharpe, Cat, B. i. p. 39. 



a. ? ad. Puerto San Juan^ Paraguay. Aug. 2Q, 1909. 



191. POLYBORUS THARUS. 



Pohjborus tharus Sharpe, Cat. B. i. p. 31 ; Arg. Orn. ii. 

 p. 81. 



a. ? ad. Luiconia, Ajo. Nov. 19, 1908. 



b, c, d. S ? nestling. Luiconia. Nov. 19, 1908. 

 e. ? young. Los Ynglases, Ajo. Feb. 9, 1909. 

 /. ? young. „ „ Mar. 3, 1909. 

 //. ? ad. ,, „ Mar. 20, 1909. 



The adult female taken in November is in full plumage 

 and very much worn ; it was the parent of the three 

 nestlings. 



Irides brown, orbits and cere orange-chrome ; bill pearly 

 slate-coloured; legs and toes lemon-yellow, nails black. 



The adult female, shot on March 20, is not really fully 

 adult_, inasmuch as the feathers of the breast are barred as 

 in the old bird, but have broad white shaft-streaks ; new 

 feathers are appearing in this region, and these are as in the 

 fully adult, while the hind-neck, ear-coverts, and fore-neck are 

 more strongly tinged with rufous. This appears to point to 

 an immature stage, intermediate between the young and fully 

 adult bird. 



I can add little to the excellent notes given by Mr. Hudson 

 in the ' Argentine Ornithology ,' except to say I have never 

 seen one of these birds take living prey, and have always 



