An external stem mine. Frass is deposited at wide intervals. Pupation
in the mine (Spencer, 1972b:
27; Spencer, 1976: 76).
Larva: The larvae of flies are leg-less maggots without a head capsule (see examples). They never have thoracic or abdominal legs. They do not have chewing mouthparts, although they do have a characteristic cephalo-pharyngeal skeleton (see examples), usually visible internally through the body wall.
Posterior spiracles each bearing numerous (up to 28) bulbs, on three
arms (Spencer, 1976: 76 (fig.
Puparium: The puparia of flies are formed within the hardened last larval skin or puparium and as a result sheaths enclosing head appendages, wings and legs are not visible externally (see examples).
Black; posterior spiracles each bearing numerous (up to 28) bulbs,
on three arms (Spencer, 1972b:
Hosts in Great Britain & Ireland:
of year - mines: Currently unknown.
of year - adults: June.
in Great Britain & Ireland: Uncommon. Wiltshire (Farley
Down) and Dunbarton (Bonhill) (Spencer, 1972b: 27); Cambridgeshire (VC29), Glamorganshire (VC41) and West Sussex (VC26) (NBN
elsewhere: Widespread in continental Europe including France,
Germany, Sweden (Spencer, 1976:
76), Czech Republic, Latvia, Lithuania, Poland and Slovakia (Martinez
in Fauna Europaea).
NBN Atlas links to known host species:
British and Irish Parasitoids in Britain and elsewhere: