344 Mr. C. H. B. Grant on Birds collected in Argentina , 
are less rich and lighter in colour; these I take to he 
younger birds, though they have the speculum on the wing 
as in the adult specimens. 
This Goose had not been seen in the Ajo district for 
many years until the winter of 1909. A good many made 
their appearance in the middle of May, and several hundreds 
had arrived before I left in the middle of June. 
1 was afterwards informed by Miss Runnacles “that in 
company with Chloephaga poliocephala they came in their 
thousands and literally covered the camp, being most 
unwelcome visitors, as the drought had caused a scarcity 
of grass and these flocks of Geese helped to eat what was 
left; they began to thin out towards the end of July, and by 
the middle of August hardly one remained.^ 
This Goose is locally known as the <c Pato de la sierra ” 
(Hill duck). Strange or rare birds in that district are always 
said to be visitors from the sierras. 
212. Cygnus nigricollis. 
Cygnus nigricollis Arg. Orn. ii. p. 124, 
Cygnus melancoryphus Salvad. Cat. B. xxvii. p. 39. 
a, $ ad. Los Ynglases, Ajo. Nov. 10, 1908. 
Irides deep brown; bill dark slate-coloured, cere and 
lores deep red; legs and toes livid flesh-coloured. 
This Swan is common in the Ajo district, and is found 
in small parties throughout the winter months. Owing to 
the dry seasons experienced, I did not find any nests, and 
although I examined every lagoon for them no young birds 
were observed. 
213. COSCOROBA CANDIDA. 
Coscoroba Candida Arg. Orn. ii. p. 126. 
Coscoroba coscoroba Salvad. Cat. B. xxvii. p. 42. 
a, b. $ ad. Laguna de Milan, Ajo. Nov. 15, 1908. 
c. ? ad. Los Ynglases, Ajo. April 13, 1909. 
Irides white; bill, legs and toes pink-flesh-coloured. 
Both the November birds have dropped all the primaries 
and new ones are developing. The April bird has almost 
completed the moult. 
