474 Mr. C. II. B. Grant on Birds collected in Argentina , 
The flight and call reminded me very much of the European 
Little Tern (S. minuta ). 
The nest was a mere hollow scraped in the sand, generally 
under the cover of a tuft or of a few blades of grass, and 
three eggs seems to be the full clutch. 
Twenty-five eggs were brought home, taken at Colonia 
Risso, Paraguay, Sept. 9, and Rio Apa, Sept. 10; many of 
these agree with the description given in the 4 Catalogue of 
Eggs in the British Museum/ others have the ground stone- 
colour, some being slightly deeper in tone than others. 
2G8. Gelochelidon anglica. 
Gelochelidon anglica Saunders, Cat. B. xxv. p. 25. 
a, b. A $ ad. Luiconia, Ajo. April 29, 1909. 
Both specimens are in full winter plumage. In the Ajo 
district I have only noticed this Tern near the tidal waters, 
and on the date on which 1 obtained the two birds I saw 
many hawking over the creek or sitting on the grassy flats 
in company with numberless Gulls. I, however, believe that 
it is only a winter visitor to this district. Both on the wing 
and sitting it can be distinguished from every other Tern by 
the black bill, which is very striking. The 29th of April 
was the first day that I saw ir, and afterwards 1 noted it 
onty near Bella Vista, on the Rio Parana, when four were 
observed flying about the river on November 12, 1909 (these 
had black crowns); while on my second visit to the Ajo 
district I saw a few in March 1910 in winter dress. 
269. Larus dominicanus. 
Larus dominicanus Arg. Orn. ii.p. 197 ; Saunders, Cat. B. 
xxv. p. 245. 
a. $ ad. Cape San Antonio. Dec. 21, 1908. 
b. A hum. ,, „ „ Dec. 21, 1908. 
c. d young. Los Ynglases, Ajo. Alar. 8, 1909. 
d. d ad. „ „ May 24, 1909. 
e. $ young. Tuyu, Ajo. Eeb. 28, 1910. 
/. ? imm, ,, „ Mar. 1, 1910. 
This is quite a common Gull in the Ajo district and is 
