1918.] Cape San Antonio, Buenos Ayres. 373 



to normal conditions. In the course of the big drought the 

 swamps not only dried up in all their extension, but their 

 aquatic vegetation totally disappeared, and they became at 

 one with the surrounding plains. In October of 1913, when 

 the great flood touched its highest point, two-thirds of the 

 Yngleses was under water ; and the old joke was revived 

 that the Gibsons bred their Lincoln slieep to a web-footed 

 type ! In the total course of forty-five years, I have ob- 

 served the increase of one or two species of birds ; whilst a 

 few others have diminished, from natural causes. 



Probably, I may not have further opportunities of con- 

 tinuing these notes. Voyages to and from the Kiver Plate 

 are not of a festive nature at present. I also found on my 

 last two visits to the Yngleses (1915 and 1916) that my 

 once-good horses had degenerated sadly — they galloped 

 heavily and stumbled frequently. Localities, too, had 

 struggled absurdly far apart, as compared with my former 

 estimates (though, of course, the " legua pampa " was 

 always of a similar quantity to the " Scotch mile"). How- 

 ever, the Buenos Ayres Museum and myself have arranged 

 to exploit the district conjointly, by means of one of the 

 museum's collectors. My former collections are to be found 

 in the Museums of Buenos Ayres, London (Natural History 

 Museum), Edinburgh, and Dresden. I believe there are a 

 few specimens also in Dublin and Cambridge. 



To Mr. Ogilvie-Grant and Mr. Charles Chubb, of the 

 Natural History Museum, I am indebted for much kindly 

 assistance, in identification and other matters, as also to 

 the good services of Mr. James Wells — which I take this 

 opportunity of gratefully acknowledging. 



The enumeration and nomenclature herein followed is 

 that of Sclater and Hudson's 'Argentine Ornithology/ 

 except when the species in question does not happen to 

 figure in that work. This publication has been my 

 general authority since it first saw the light in 1889 ; nor 

 could I wish a better guide in field-work than Mr. Hudson's 

 accurate and interesting observations. Otherwise, any 

 further references are confined to my own former paper 



