(RED-HEADED MARSH-BIRD.)
+Agelæus ruficapillus+, _Scl. Cat. B._ xi. p. 347. +Xanthosomus
ruficapillus+, _Scl. et Salv. P. Z. S._ 1869, p. 159 (Buenos
Ayres); _iid. Nomencl._ p. 37; _White, P. Z. S._ 1882, p. 602
(Salta, Catamarca). +Chrysomus frontalis+, _Burm. La-Plata
Reise_, ii. p 492 (Paraná).
_Description._--Glossy blue-black; crown of head and middle of
throat dark chestnut; bill and legs black: whole length 7·5 inches,
wing 3·7, tail 2·9.
_Hab._ Argentina and Paraguay.
The sexes are alike in this species: the crown of the head is rufous,
and with this exception the whole plumage a rich glossy blue-black. The
beauty of the bird and its delicate, plaintive voice would no doubt make
it a favourite with man if he saw more of it, only it lives and breeds
in marshes, and does not come near his habitations. The Red-heads are
gregarious and migratory. The flock can scarcely be said to break up in
the breeding-season, as the birds all make their nests near together in
the reeds. The nest is placed about one or two feet above the water, is
about six inches in depth, and made of leaves and aquatic grasses woven
together. The eggs are four, pointed, with a white or pale bluish
ground, and spotted with black at the larger end.
The song of the Red-head is quite unique in character. It begins with a
low, hollow-sounding note, then the voice changes to a clear, sorrowful
tone, rising in a rapid succession of short notes, and falling again in
longer ones.
After the breeding-season the birds fly about in flocks of two or three
hundred individuals, and sing in concert on the trees.
Their chirp has a peculiar metallic sound, and can be imitated by
tapping on the edge of a copper bell with the finger-nail.