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Updated: August 22, 2026
At first the head is indicated by the buds forming the rudiments of limbs; the segments to which they are attached do not form a true head until after the mouth-parts have attained their jaw-like characters, and it is not until the insect is about to be hatched, that the head is definitely walled in. We have arrived, then, at our Leptus, with a head bearing two pairs of jaws.
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