Australian insectsFroggatt, Walter W. (Walter Wilson)
Science
Australian insects
Froggatt, Walter W. (Walter Wilson)
Insects -- Australia
The eggs are not stalked but are attached to the food plant; the young
elongated larva, furnished with stout projecting jaws, crawls upon the
foliage and feeds upon aphids. This Genus was considered peculiar to
Australia, until in the last few years two species have been described
from Africa and a third from Burmah.
The curious black mottled lace-wing, _Porismus strigatus_, has a
narrow red head furnished with long slender antennae and large rounded
eyes; the front portion of the thorax forms a regular neck. The narrow
elongate black wings, blotched and tipped with pale yellow shading into
white, are folded over the back forming a ridge when at rest on a tree
trunk. They are sometimes met with about Sydney, and are common in New
England toward the end of summer. I found larvae and eggs under logs in
that district which I believe to be those of this insect; the former
were stalked and deposited in a narrow semicircle attached to each
other; the larvae, of the usual tick-shaped form, covered themselves
over with bits of burnt ashes, and clung to the surface of the log,
where they easily escaped notice with their protective covering.
[Illustration:
=Fig. 36.=--Larva of _Porismus strigatus_ (Bohem).
The adult Lace-wing is shown in Plate VI., Fig. 7.
(Original W.W.F.)]
The Genus _Osmylus_ contains a number of slender insects with longer,
semitransparent, spotted, brown wings, and fine antennae clothed with
short hairs. The larvae, active little creatures, feed about among
the leaves destroying aphids. _Osmylus tenui_ measures about 1¼ inches
across the outspread wings, is of the usual dull brown tint, and is
found in Victoria.
In the Genus _Drepanopteryx_ the fore wings are short, broad, rounded
in front at the shoulders, and arcuate on the hind margin; the hind
pair are rounded, semitransparent, with a darker costal margin; when
resting upon a twig they tuck the head down under the thorax, and turn
the wings upward, almost standing on their heads; they could be easily
passed over from their resemblance to a brown leaf.
_Drepanopteryx binocula_ and _D. instabilis_ are found in N.S. Wales
and Victoria; the first has dark fore wings and measures about ¾ of an
inch; the second is somewhat smaller and lighter coloured.
[Illustration: Fig. 37.
Fig. 38.
=Figs. 37 and 38.=--Life History of the Brown Lace-wing.
37.--_Micromus Australis_ (Froggatt).
38.--Larva.
(“Agricultural Gazette,” N.S.W.)]
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