" _Ibid_.
_Leaf Caterpillars_.
The design of the caterpillars in rolling up the leaves is not only to
conceal themselves from birds and predatory insects, but also to protect
themselves from the cuckoo-flies, which lie in wait in every quarter to
deposit their eggs in their bodies, that their progeny may devour them.
Their mode of concealment, however, though it appear to be cunningly
contrived and skilfully executed, is not always successful, their
enemies often discovering their hiding place. We happened to see a
remarkable instance of this last summer (1828), in a case of one of the
lilac caterpillars which had changed into a chrysalis within the closely
folded leaf. A small cuckoo-fly, aware, it should seem, of the very spot
where the chrysalis lay within the leaf, was seen boring through it with
her ovipositor, and introducing her eggs through the punctures thus made
into the body of the dormant insect. We allowed her to lay all her eggs,
about six in number, and then put the leaf under an inverted glass. In a
few days the eggs of the cuckoo-fly were hatched, the grubs devoured the
lilac chrysalis, and finally changed into pupae in a case of yellow
silk, and into perfect insects like their parent.--_Library of
Entertaining Knowledge_.
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