Within the bags, the larvae twist and turn around so that their heads face downwards near the posterior opening of their bags. This done, larvae enter the pupal stage. Pupation is completed in 2 to 3 weeks. Just prior to moth emergence, male pupae work their way through the posterior opening until they partially protrude. Male moths then emerge from the pupal case.
Male moths are black in coloration but their wings are clear.
This text was extracted from the publication, MF-728.