Larva feeding inside hollow stem. Pupation internal (Spencer, 1972b: 31).
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).
Brown; posterior spiracles each with 12-13 bulbs in a regular ellipse
(Spencer, 1972b: 31).
Hosts in Great Britain & Ireland:
of year - mines: July-August.
of year - adults: May.
in Great Britain & Ireland: Widespread. Surrey (Godalming),
Somerset (Radstock), Cornwall (Carbis Bay), Suffolk (Barton Mills),
Derby (Miller's Dale), Wales (Llanridian), Dunbarton (Bonhill) (Spencer, 1972b: 31), Warwickshire (Robbins,
1991: 35); East Cornwall (NBN
NBN Grid Map:
elsewhere: Europe (Spencer,
1990: 69) including Czech Republic, Germany, Italian mainland,
Lithuania, Poland, Slovakia and The Netherlands (Martinez in Fauna Europaea).
NBN Interactive Grid Maps of known host species:
British and Irish Parasitoids in Britain and elsewhere: