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Each time the organism adapts itself to its new mode of existence, "as perfectly as when it becomes adult"; and we see the insect, which was clear-sighted, become blind; it loses its feet, to recover them later; its slender body becomes ventripotent; hard, it grows soft; its mandibles, at first steely, become hollowed out spoonwise, each modification of conformation having its motive in a fresh modification of the conditions of the creature's life.
The labrum is prominent, is not distinctly divided from the head, is curved in front and edged with pale and very fine bristles. The mandibles are small, reddish toward the tips, blunt and hollowed out spoonwise on the inner side. Below the mandibles is a fleshy part crowned with two very tiny nipples. This is the lower lip with its two palpi.
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