136 BIRDS OF LA PLATA 
Sanborombon ; probably ti®y have before now been 
driven from this locality by the duck-shooters, but 
it was formerly their favourite rendezvous, where 
they collected in large numbers, though further 
north scarcely one was ever seen. 
Durnford tells us that this Goose is resident on 
Lake Colguape in the territory of Chupat, and breeds 
there abundantly. 
BLACK-NECKED SWAN 
Cygnus nigricollis 
White ; head and neck black; postocular stripe and chin white ; 
lores naked; bill plumbeous, cere red. Length 48, wing 17 inches. 
Female similar. 
To my perhaps partial mind this species is pre- 
eminent for beauty among the Swans, although it 
is considerably smaller than the bird of the Old 
World, and does not, it must be admitted, comport 
itself so majestically. In questions of this kind it 
is natural for every one to be somewhat biassed in 
favour of the things of his own country ; but it will 
be readily admitted by all, I think, that the black- 
necked bird is one of three species greatly surpassing 
all others of this genus in beauty—the other two 
being, of course, the domesticated Swan of Europe 
and the Australian Black Swan (the most graceful 
of Swans). 
This Swan is very abundant on the pampas of 
