428 On some Birds of the Argentine Republic. 



are at all common, excepting those of the Shoveller. These 

 eggs were invariably covered over with a fresh lining in the 

 nests of Fulica armillata, but not in the others. 



"f*'7. Sterna anglica. 



Viralva aranea, Darw. Zool. Beagle, iii. p. 143 (Bahia 

 Blanca). 



Gelochelidon anglica, Scl. et Salv. P. Z. S. 1871, p. 572 

 (S.E. Brazil). 



As mentioned above, this species was accidentally omitted 

 in ' Argentine Ornithology.' Darwin obtained a specimen 

 of it near Bahia Blanca, and Rogers got examples on the coast 

 of S.E. Brazil. Mr. Holland sends a single, apparently adult 

 female in winter plumage. 

 ~f~ 8. Sterna trudeauii. (Arg. Orn. ii. p. 195.) 



This Tern is rare with us, excepting in the breeding- 

 season, when it appears suddenly and in numbers, either 

 singly or in pairs. 



Whilst hunting through a large gullery of Larus maculi- 

 pennis early in November, I came upon a corner of the lagoon 

 entirely occupied by these pretty Terns. There was little 

 shelter for the nests, a few scattered willow-stumps, but no 

 rushes or flags, and the water was some 4| feet deep. The 

 nests were all placed close together, as the Gulls' nests were, 

 thirty or forty of them, each afoot or two from its neighbour, 

 and so on ; they were very shallow structures, composed of 

 green water-grasses (very succulent ones and wet), with no 

 lining, and supported on the water by the thick growth of 

 grass underneath. The eggs were three to four in number, 

 of the usual Tern-type, varying from the dark, thickly spotted 

 and blotched varieties to the thinly spotted pale ones ; in no 

 two nests were the eggs similar. As I approached the 

 ternery (if there is such an expression) the birds became very 

 anxious, darting down close to my head as I stood over a 

 nest and uttering shrill cries. The sight was a beautiful 

 one, with the thousands of Gulls and these graceful Terns 

 as well, all showing beautifully against a blue sky. 



9. Larus cirrhocephalus. (Arg. Orn. ii. p. 201.) 



This Gull is very plentiful here in the breeding-season, but 

 I was unable to find its nesting-place. 



