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Tinochorus D’Orbignyanus, Isid. Geof. St. Hilaire. ‘This is the 
small Partridge of the Andes, and is called by the natives ‘‘ Perdix 
Cordellierana.”’ It comes down to the plains in severe winters. 
Generally found in pairs in the valleys near the summit of the An- 
des. ‘The male shows the strongest attachment to his mate, and 
calls her by a melancholy tone or cry when separated. They are 
so tame that the natives kill them with stones, and so stupid that a 
stone may be thrown at them several times before they will rise. 
Iris brown. 
_ Columba Boliviana, Auct. This little dove is found in small flocks 
in the valleys of the Andes, and, in the winter, visits the coast. It 
is known to the natives by the name of “Tortola Cordellierana.” 
This is the smallest of the three species found in Chile. It makes 
a whistling noise with its wings when it rises from the ground. Iris 
brown. 
Dafila urophasianus, Eyton. Iris brown. Found in yalleys on 
the eastern side of the Andes. 
Anas ? Iris brown. Found inhabiting the rapid rivers 
of the Andes. This bird swims and dives against the rapidity of 
the mountain torrents in a manner truly astonishing. It seldom or 
never leaves the rivers of the Andes, and, like the Grebes, seldom 
makes use of its wings, although when disturbed it flies a short 
distance. Generally seen in pairs. 
Mr. Gould made some observations on this collection, and par- 
ticularly drew attention to the last species in the list, which Mr. 
Bridges places in the genus Anas with a note of doubt. Mr. Gould 
observed that this bird was unknown to ornithologists, and pre- 
sented a most singular combination of characters. In many of its 
characters it approaches the Ducks (Anatide), but in others it 
evinced an affinity to the Mergansers (Mergus), especially in its long 
and stiff tail-feathers, and narrow and pointed beak. It differs, 
however, from either of the groups mentioned in having, in both 
Sexes, a strong spur on the wing. Mr. Gould proposed for this 
new bird the name Merganetta armata. 
Genus MrEra@anetTTa. 
Rostrum haud minis longum quam caput, rectum ; feré cylindra- 
ceum, ungue apicali distincto, incurvato, at minds abrupté quam in 
genere Mergus dicto. Mandibula superior lamelloso-dentata, vel 
tornio crasso carneo, intis profundeé serrato, instructa ; naribus lineari- 
bus feré centralibus. 
Ale mediocres primariis secundo et tertio longissimis; humeris 
caleare valido et acuto armatis. 
Cauda, ut in mergo, rigida. 
Tarsi aliquantd elongati, squamis hexagonis ad latera obtecti, et 
anticé scutellis. Digiti palmati, medio quam tarsus paululam lon- 
giore ; halluce libero, alté posito, et paululim lobato. 
MERGANETTA aARMATA. Mas: vertice nigrescenti-fusco, strigd an- 
gustd, albd cincto ; hac, lined faciali ejusdem colore, conjunctd ; 
