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).
The larvae are almost certainly not leaf-miners but probably feed
internally either in stems of flower-heads (Spencer, 1972b: 61).
Hosts in Great Britain & Ireland: Currently unknown.
elsewhere: Currently unknown.
of year - larvae: Currently unknown.
of year - adults: June, August.
in Great Britain & Ireland: Uncommon. Stafford (Madeley),
Brecknock (Cusop) (Spencer, 1972b: 61); Radnorshire (NBN
Distribution elsewhere: Widespread in continental Europe including Austria, Denmark, Finland,
Norway and Sweden (Spencer, 1976:
295), ? Corsica, Estonia, Germany, Lithuania and Poland (Martinez
in Fauna Europaea).
recorded from East Palaearctic (Martinez in Fauna Europaea), U.S.A. and Canada (Spencer,
NBN Atlas links to known host species:
British and Irish Parasitoids in Britain and elsewhere: