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T H E B L U E Y E L L O W - B A C K E D W A R B L E R.
SYLVIA AMERICANA, LATH.
P L A T E X V . MALE AND FEMALE.
THIS pretty species enters Louisiana from the south as early as springappears,
at the period when most insects are found closer to the ground,
and more about water-courses, than shortly after, when a warmer sun has
invited every leaf and blossom to hail the approach of that season when
they all become as brilliant as nature intended them to be. The little fellow
under your eye is then seen flitting over damp places, such as the
edges of ponds, lakes, and rivers, chasing its prey with as much activity
and liveliness as any other of the delicate and interesting tribe to which
it belongs. It alights on every plant in its way, runs up and down it,
picks here and there a small winged insect, and should one, aware of its
approach, fly off, pursues it and snatches it in an instant.
I have placed a pair of these Warblers on a handsome species of Iris.
This plant grows in the water, and in the neighbourhood of New Orleans,
a few miles below that city, where I found it abundantly, and in bloom, in
the beginning of April. Several flowers are produced upon the same
stem. I have not met with it anywhere else, and the name of Louisiana
Flag is the one commonly given it.
As soon as the foliage of the forests begins to expand, the Blue Yellow
backed Warbler flies to the tops of the trees, and there remains during
the season, gleaning amongst the leaves and branches, in the same active
manner as it employed when nearer the ground, not leaving off its quick
and short pursuit of small insects on the wing. When on the branches,
it frequently raises its body (which is scarcely larger when stripped of
its feathers than the first joint of a man's finger) upwards to the full
length of its legs and toes, and is thus enabled to seize insects otherwise
beyond its reach.
Its flight is that of a true Sylvia. It ascends for a while in a very
zigzag manner, and returns suddenly to nearly the same place, as if afraid
to encounter the dangers of a prolonged excursion. I do not think it
ever flies to the ground. It hops sidewise as well as straight forward,
BLUE YELLOW-BACK WARBLER. 79
hangs like a Titmouse, and searches the cups of even the smallest flowers
for its favourite insects.
I am inclined to think that it raises two broods in a season, having
seen and shot the young on the trees, in Louisiana, early in May, and
again in the beginning of July. The nest is small, formed of lichens,
beautifully arranged on the outside, and lined with the cottony substances
found on the edges of different mosses. It is placed in the
fork of a small twig, and so far towards the extremity of the branches
as to have forced me to cut them ten or fifteen feet from it, to procure
one. On drawing in the branch carefully to secure the nest, the
male and female always flew toward me, exhibiting all the rage and animosity
befitting the occasion. The eggs are pure white, with a few reddish
dots at the larger end, and were in two instances four in number.
It was several years before I discovered one of these nests, so small are
they, and so difficult to be seen from the ground.
This species is found throughout the United States, and may be considered
as one of the most beautiful of the birds of those countries. It
has no song, but merely a soft, greatly prolonged twitter, repeated at
short intervals. It returns southward, out of the Union, in the beginning
of October.
SYLVIA AMEIUCANA, Lath. Ind. Ornith. vol. ii. p. 520.— Ch. Bonaparte, Synops. of
Birds of the United States, p. 33.
YELLOW-BACKED WARBLER, Lath. Synops. vol. iv. p. 440.
BLUE YELLOW-BACK WARBLER, SYLVIA PUSILLA, Wils. Americ. Ornith. vol. iv.
p. 17. PL 28. fig. 3. Male.
Adult Male. Plate XV. Fig. I.
Bill longish, depressed at the base, nearly straight, tapering to a
point. Nostrils basal, oval, half concealed by the feathers. Feet of ordinary
length, slender; tarsus compressed, covered anteriorly with a few
long scutella, acute behind, longer than the middle toe; toes scutellate
above, free; claws arched, slender, compressed, acute.
Plumage blended, glossy. Wings longish, little curved, the first quill
longest. Tail slightly forked, of ordinary length, the twelve feathers rather
narrow and obtuse. A few longish bristles at the base of the upper
mandible.