rear spiraculum, lateral and dorsal view

Pteridium aquilinum, Savelsbosch: cephalic skeleton and mandble, mouth field

front spiraculum lateral; rear spiraculum dorsal

cephalic skeleton of 3rd instar larva (from Dušek)

The larva is described by de Meijere de Meijere (1911a, as Hylemyia cinerosa) and Dušek (1970a).