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The embryo of the Phora is already well developed, so that in three hours after the egg is inserted in the body of its unsuspecting and helpless host, the embryo is nearly ready to hatch. In about two hours more it actually breaks off the larger end of the egg-shell and at once begins to eat the fatty tissues of its victim, its posterior half still remaining in the shell.
Foul-brood sometimes attacks our American hives, and, though the cause may not be known, yet from the hints given above we hope to have the history of our species of Phora cleared up, should our disease be found to be sometimes due to the attacks of such a parasitic fly. It is one-half to two-thirds of a line long.
Then there are Conops and Volucella, the former of which lives like Tachina and Phora within the bee's body, while the latter devours the brood.
In fat corpses one species of maggot is found, the rhizophagus, while thin corpses are patronized only by the phora. The latter is evidently the aristocrat, the fastidious gourmet which turns up its nose at a heavy meal of copious breasts and juicy fat bellies. Just think, there is no perfect equality, even in the manner in which we feed the worms. "But this is where we stop."
When impelled by instinct to provide for the continuance of its species, the Phora enters the beehive and gains admission to a cell, when it bores with its ovipositor through the skin of the bee larva, laying its long oval egg in a horizontal position just under the skin.
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