506 Mr. E. Gibson on the OrnitUoIogij of [Ibis, 



1915 (with the flood still prevailing) the over-population 

 had much decreased. Still later, during my last visit (the 

 summer of 1916-17) when a drought had ensued, tlie birds 

 were generally distributed over their former area. 



Regarding the breeding-notes, the full clutch would seem 

 to be six, and the whole month of October — from the 

 5th onwards — the favourite season. The eggs average 

 35 X 29 mm. 



292. Circus cinereus Vieill. Cinereous Harrier. 



To my previous notes of 1879 I have nothing to add. 

 My diary is only a monotonous record of individual birds 

 observed at varying intervals and all periods of the year. 

 Nor are tiiese occurrences so numerous as to confirm my 

 former statement that it was common in our district — a 

 modification of my opinion in which I am borne out by 

 Mr. Claude Grant. 



Mr. Hudson writes little more in extenso, tliongh he is 

 able to briefly describe the nesting-situation and the eggs, 

 a good fortune which has not come my way. 



293. Circus macropterus Vieill. Long-winged Harrier. 

 This is the species erroneously alluded to by myself as 



IJrubitinga unicinctu Temm. (Ibis, 1879, p. 411). 



Hudson dismisses it very briefly : — '' Hab. South America. 

 This species is also found in the Republic, but is not so 

 common as the former species [Circus cinereus Vieill.)." 

 But it is to be noticed, on the other hand, tliat he gives 

 prominence to Antenor unicmctus as " the common Buzzard 

 of the Plata region." 



Claude Grant totally ignores A. iinicinctns in the Ajo 

 district of the " Plata region," though meeting with it in 

 central Paraguay, where it also occurred with the first- 

 named species still farther north. Yet, in conjunction 

 with Miss Runnacles, he makes a small collection of Circus 

 macropterus or maculosus at the Yngleses in Ajo, the series 

 being so sufficiently complete that he is able to give a 

 meticulous analysis of the " no less than six bewildering 



