The proportion of the head gradually becomes smaller and that of the abdomen longer with
each molt. The reproductive organs and wings of the adult remain inactive as imaginal discs for
several molts. When wings begin to develop during the last two molts before the adult molt, they
appear first as small external buds, become about one third the adult size with the next molt,
and finally reach adult size and function after the last molt at which time, the insect is also
reproductively mature.
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