The prepupal phase is a stage of development in the life cycle of an insect. It follows the larval stage, which is characterized by rapid growth and metamorphosis. During the prepupal phase, the insect's body undergoes further changes as it prepares for the pupal stage. The prepupal phase is a relatively short period of time, lasting only a few days in some species. During this time, the insect's body begins to harden and its organs begin to mature. At the end of the prepupal phase, the insect enters the pupal stage, where it will remain until it emerges as an adult.