At These Times The Fireflies Are Seen Flitting About From
Hedge To Hedge.
On a dark night the light can be seen at
about two hundred paces distant.
It is remarkable that in
all the different kinds of glowworms, shining elaters, and
various marine animals (such as the crustacea, medusae,
nereidae, a coralline of the genus Clytia, and Pyrosma),
which I have observed, the light has been of a well-marked
green colour. All the fireflies, which I caught here, belonged
to the Lampyridae (in which family the English glowworm
is included), and the greater number of specimens were of
Lampyris occidentalis. [4] I found that this insect emitted
the most brilliant flashes when irritated: in the intervals,
the abdominal rings were obscured. The flash was almost
co-instantaneous in the two rings, but it was just perceptible
first in the anterior one. The shining matter was fluid and
very adhesive: little spots, where the skin had been torn,
continued bright with a slight scintillation, whilst the
uninjured parts were obscured. When the insect was decapitated
the rings remained uninterruptedly bright, but not so brilliant
as before: local irritation with a needle always increased
the vividness of the light. The rings in one instance retained
their luminous property nearly twenty-four hours after the
death of the insect. From these facts it would appear probable,
that the animal has only the power of concealing or
extinguishing the light for short intervals, and that at other
times the display is involuntary.
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