stem mine with a mass of black frass at the end of mine. Pupation
external (Spencer, 1976:
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.
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).
Hosts in Great Britain & Ireland: Currently unknown.
of year - mines: Currently unknown.
of year - adults: Currently unknown.
in Great Britain & Ireland: Unknown. Included as British
by Spencer (1972b: 108).
NBN Grid Map:
elsewhere: Uncommon but widespread with confirmed records from
Austria, France, Finland, Greece, Latvia, Norway, Switzerland (Spencer,
1976: 69), Czech Republic, Germany, Hungary, Lithuania and Switzerland
(Martinez in Fauna Europaea).
NBN Interactive Grid Maps of known host species:
British and Irish Parasitoids in Britain and elsewhere: Currently unknown.