It is in wellnigh universal use for those instars of ametabolous and hemimetabolous insects in which the external wing-rudiments have become conspicuous (fig. [Please select]
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The preparatory instars of such insects are aquatic; the adult instar is aerial. [Please select]
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All the larval and nymphal instars are active, and the wing-rudiments are outwardly visible long before the final moult. [Please select]
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In many maggots the mouth-hooks and the front spiracles become more and more complex in form in the successive instars. [Please select]
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The instars preceding this presumably had originally outward wing-rudiments in all insect life-histories, and the endopterygote condition was attained by the postponement of the outward appearance of these to successively later stages. [Please select]
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