INSECTS
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Fig. 107. A dead potato aphis that has contained a parasite, which when adult escaped through the door cut in the back of the aphis
on almost any plant, you will most likely note here and there a much swollen aphid of a brownish color. Closer examination reveals that such individuals are dead, and many of them have a large round hole in the back, perhaps with a lid standing up from one end like a trap door (Fig. 107). These aphids have not died natural deaths; each has been made the involuntary host of another insect that converted its body into a temporary
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Fig.109. A female Aphidius inserting an egg into the body of a living aphis, where the egg hatches; the larva grows to maturity by feeding in the tissues of the aphis. (From Webster)
home. The guest that so ravishes its protector is the grub of a small wasplike insect (Fig. 108) with a long, sharp ovipositor by means of which it thrusts an egg into the body of a living aphid
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Fig. 108. Aphidius, a common small wasplike parasite of aphids
(Fig. 109). Here the egg hatches and the young grub feeds on the juices of the aphis until it is itself full-grown, by which time the aphid is exhausted and dead. Then the grub slits open the lower wall of the hollow corpse and spins a web between the lips of the opening and against the surface of the leaf below, which attaches the aphid shell to the support. Thus secured, the grub proceeds to give
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