The first instar is metapneustic, later instars are amphipneustic.
2.
The larva is amphipneustic ( having only the anterior and posterior pairs of spiracle ).
3.
The larva is amphipneustic ( having only the anterior and posterior pairs of spiracles ).
4.
The tracheal system is metapneustic in the first instar early age and amphipneustic in the subsequent stages.
5.
The larva is amphipneustic : it has two pairs of spiracles, one toward the head and one at the tail.
6.
Those of the first type are elongated and cylindrical in shape and have a metapneustic or amphipneustic tracheal system, provided with a pair of abdominal spiracles and, possibly, a thoracic pair.
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