to become quiescent and develop from a larva into an adult

Stage when an insect is becoming a pupa.

develop into a pupa; "the insect larva pupate"

entering the stage of life of an insect, between the larval and adult stage, when metamorphosis occurs. This usually occurs in a cocoon or case.

A period of time when an insect changes from a larva to its mature form

(verb) to leave the larval stage and enter the pupal stage

To change from a larva into a pupa; to pass through the pupal stage.