The =Cloudy Tortoise Beetle= (_Cassida nebulosa_)—Fig. 83. One-fifth to
one-fourth of an inch long; the broad neck-shield projects in front over
the small head. The wing-covers, too, are much broader than the body of
the animal; they are longitudinally ribbed. Dorsal side reddish brown,
in young individuals greenish; always with black spots. Ventral side
black. Larva elongated oval, yellowish green. Segments of the body beset
with thorn-like structures bearing lateral branches; the last segment
possesses a “tail-fork,” which the larva usually carries bent over its
back and on which it heaps up its dung. The beetles which have survived
the winter usually attack in spring only wild goose-foot and orach
plants, on which they lay their eggs in heaps. The larvæ quickly appear,
and to begin with chiefly keep to the under sides of the leaves. They
are sluggish, grow quickly, and devour the leaf substance; when fully
developed they cement themselves to a leaf and become pupæ. In June the
beetles of the second generation appear, which again lay their eggs on
the leaves. In favourable weather there may be even a third generation.
In many it happens that the beetles of the second generation migrate to
beet or mangold plants, sometimes damaging them to a very great extent.
_Remedy_: Rooting out species of goose-foot or orach.
The =Earth Fleas=, or =Flea Beetles=, are all small leaf beetles with
the power of springing, and therefore provided with thick thighs. Here
belong:—
[Illustration:
FIG. 84.—The Rape Flea Beetle (2) with hind-leg of the same; larva (1)
and its head.
]
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