An external stem mine. Pupation in the mine (Spencer, 1972b: 27).
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).
Posterior spiracles each with 6-7 bulbs (Spencer, 1972b: 27).
Hosts in Great Britain & Ireland:
of year - mines: Currently unknown.
of year - adults: Currently unknown.
in Great Britain & Ireland: Local. Surrey (Box Hill) (Spencer, 1972b: 27); Cambridgeshire (NBN
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elsewhere: Northern France (Spencer,
1990: 295), Germany and Slovakia (Martinez in Fauna Europaea).
NBN Interactive Grid Maps of known host species:
British and Irish Parasitoids in Britain and elsewhere: