and, after the storm blows over, these strangers and stragglers remain
for some days hawking for prey in the neighbourhood. It is curious to
note that they do not show any disposition to seek for watercourses. It
may be that they feel lost in a strange region, or that the panic they
have suffered, in their long flight before the wind, has unsettled their
instincts; for it is certain that they do not, like the dragon-fly in
Mrs. Browning's poem, "return to dream upon the river." They lead
instead a kind of vagabond existence, hanging about the plantations, and
roaming over the surrounding plains. It is then remarked that gnats and
sand-flies apparently cease to exist, even in places where they have
been most abundant. They have not been devoured by the dragon-flies,
which are perhaps very few in number; they have simply got out of the
way, and will remain in close concealment until their enemies take their
departure, or have all been devoured by martins, tyrant birds, and the
big robber-flies or devil's dykes--no name is bad enough for them--of
the family Asilidaa. During these peaceful gnatless days, if a person
thrusts himself into the bushes or herbage in some dark sheltered place,
he will soon begin to hear the thin familiar sounds, as of "horns of
elf-land faintly blowing"; and presently, from the ground and the under
surface of every leaf, the ghost-like withered little starvelings will
appear in scores and in hundreds to settle on him, fear not having
blunted their keen appetites.

When riding over the pampas on a hot still day, with a pertinacious
cloud of gnats or sandflies hovering just above my head and keeping me
company for miles, I have always devoutly wished for a stray dragon-fly
to show himself. Frequently the wish has been fulfilled, the dragon-fly,
apparently "sagacious of his quarry from afar," sweeping straight at his
prey, and instantly, as if by miracle, the stinging rain has ceased and
the noxious cloud vanished from overhead, to be re-formed no more. This