Genus — C A S A R C A. 
Casarca Bonaparte, Comp. List Birds Europe and 
N. Amer., p. 56, 1838 . . . . . . . . Type C. ferruginea. 
Also spelt — 
Gasarka Eyton, Monogr. Anatidse, p. 27, 1838. 
Nettalopex Heine and Reichenow, Nomencl. Mus. Heine 
Orn., p. 343, 1890 . . . . . . . . . . Type C. ferruginea. 
Large Anatine birds with long broad bills, long wings, medium tail, long legs 
and long toes. 
Under the genus name Radjah I have given Salvadori’s characters for 
distinguishing Casarca from Tadorna. I have pointed out how Radjah can 
be recognised, and would here note the differences between Casarca and 
that genus. 
The bill is long, about the same length as that of Radjah, but the sides 
do not expand so much and the culmen ridge is less defined ; the nail is not 
well differentiated but merges imperceptibly into the sides. The lameUse 
of the upper and lower mandibles project noticeably. 
The wings are longer with the second primary longest, but the first nearly 
equalling and longer than the third. 
The tail is comparatively shorter, being only about one third of the length 
of the wing. 
The metatarsus is about the same length as that of Radjah, though the 
latter is much the smaller bird. 
That is, though Radjah is shorter in the wing, agreeing with the smaller 
size of the bird, the bOl is as long and the legs are as long as in tiie present 
genus, making all the proportions quite different. 
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