366 
Messrs. A. and E. Newton's Observations 
ruber of Linnaeus—are said to have formerly visited St. Croix 
periodically, and even of late years a few seem to have been 
occasionally observed : on the south side of the leeward end of 
St. Thomas, a large indentation still bears the name of Fla¬ 
mingo-pan Bay. 
51. Black-billed Whistling Duck. Dendrocygna arborea, 
Eyton. Anas arborea, L.: Edw. Birds, pi. 193 ; PI. Enl. 804. 
iC Mangrove Duck.” 
This species is pretty common on the Mangrove Lagoons, but 
much oftener heard than seen. The whistling noise it makes 
while flying causes it to be well known by persons who have 
never even set their eyes on a specimen; for it is chiefly at night 
that it quits its solitary haunts to feed. It probably breeds in 
the island; but we have no positive authority for saying that it 
does so, and we regret we cannot furnish more information re¬ 
specting it. 
<c I procured specimens of both sexes; and, as the trachea of 
no one member of the genus Dendrocygna has been figured, that 
I am aware of, I am glad to be able 
to give a representation of the or¬ 
gan in this species. The labyrinth, 
in form, may recall that of the Gar- 
ganey ( Pterocyanea circia , Bp.), but 
is sufficiently different from it in 
many respects. 
“ I have not seen specimens suf¬ 
ficient to be able to record the sea¬ 
sonal changes of plumage in this 
species. A male, killed July 21st, 
1858, bore no sign whatever of 
moulting. In general appearance it 
greatly resembled a female obtained September 17th, 1858. 
The iris was brown, the bill black, legs dull ash-grey, the feet 
darker, and the claws black.”—E. N. 
52. [?] American Scaup Duck. Fulix affinis , Baird. Anas 
marila , Wils. pi. 69. fig. 3; Fuligula affinis , Eyton; Anas ma - 
riloides, Vigors, nec Yarrcll. 
