1920.] Cajje Ban Antonio, Buenos Ayres. 77 



415. Sterna superciliaris Vieill. Eyebrovved Tern. 



Iris dark brown ; bill bright yellow; legs and feet olive- 

 yellow, claws black. 



Claude Grant found this species abundant on the Rio 

 Paraguay, and breeding, but makes no mention of it in 

 connection with Ajo and Cape San Antonio. 



I have only once seen it in our locality, when, on 4 May, 

 1902, I secured a specimen (now in the Dresden Museum) 

 at the Laguna Milan. The flight was of the usual Tern 

 description ; and the bird (a female) showed the family 

 indifference to the presence of human beings by returning 

 immediately to the spot after being fired at once. It 

 uttered no note or cry, either when on the wing or when it 

 fell wounded iu the water. A curious incident was the 

 subsequent appearance on the scene, an hour or two later, 

 of another individual of the same species. The second bird 

 seemed wilder, and decamped after an ineffective shot. 

 Without doubt they must have been a pair, though they 

 were not seen together. 



Gelochelidon anglica Saunders, Cat. B. xxv. p. 25. 



This species does not seem to have been known to 

 Hudson, and I myself am totally ignorant of it. Claude 

 Grant's remarks, therefore, regarding its connection with 

 the Ajo district, are doubly interesting to me (' Ibis,' 

 July 1911, p. 474), and I have promised myself to devote 

 further attention to its winter visits should the opportunity 

 arise. That he should have seen various individuals about 

 the same date on two successive seasons proves that its 

 presence was not entirely fortuitous, whilst its restriction to 

 certain tidal waters on the northern part of the Yngleses 

 helps to explain my failure to notice what he alludes to as a 

 " Tern distinguishable from every other by tlie black bill, 

 which is very striking." 



416. Larus dominicaniis Licht. Dominican Gull. 

 This handsome bird is resident in our locality, where it 

 also breeds. Perhaps owing to our close proximity to the 



