216 
ANAS RUBIDUS. 
much larger about three quarters of an inch above where 
it separates into the two lobes of the lungs ; this last 
was larger than a Spanish hazel nut, flat on one side 
and convex on the other. The protuberance on each 
side of the bill communicated with the nostril, and was 
hollow. All these were probably intended to contain 
supplies of air for the bird’s support while under water ; 
the last may also protect the head from the sharp edges 
of the shells. 
The female is altogether of a sooty brown, lightest 
about the neck ; the prominences on the bill are scarcely 
observable, and its colour dusky. 
This species was also found by Captain Cook at 
Nootka Sound, on the northwest coast of America. 
272 . ANAS BUBIDUS , WILSON. — - RUDDY DUCK* 
WILSON, PLATE LXXI. FIG. V. MALE. 
The specimen from which this very rare duck was 
described was shot some years ago, on the river Delaware, 
and appears to be an entire new species. The female, 
described in the next article, was killed in the same 
river ; and they are the only individuals of their kind I 
have met with. They are both preserved in the superb 
museum of my much respected friend, Mr Peale, of this 
city. 
On comparing this duck with the description given, 
by Latham of the Jamaica shoveller, I was at first 
inclined to believe I had found out the species; but a 
more careful examination of both satisfied me that they 
cannot be the same, as the present differs considerably 
in colour; and, besides, has some peculiarities which 
the eye of that acute ornithologist could not possibly 
have overlooked, in his examination of the species laid 
to have been received by him from Jamaica. Wherever 
the general residence of this species may be, in thispart 
of the world, at least, it is extremely rare, since anong 
the many thousands of ducks brought to our markets 
during winter, I have never heard of a single individual 
of the present kind having been found among then. 
