develops from prepupa stage 2 third instar larva stage P1 prepupa FBbt:00005343 DEPRECATION WARNING. L3-2 White puparium (Bainbridge and Bownes, 1981). Its posterior spiracles and the ridge between the anterior spiracles tan to an orange color and the animal stops wriggling completely (Bainbridge and Bownes, 1981). This stage ends when the puparium becomes brown to the unaided eye (Bainbridge and Bownes, 1981). fly_anatomy.ontology