An external stem mine, with widely spaced grains of black frass.
Pupation takes place at the end of the mine (Spencer,
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).
Black; posterior spiracles each with 6-7 bulbs (Spencer,
Hosts in Great Britain & Ireland:
of year - mines: September.
of year - adults: Two generations a year.
in Great Britain & Ireland: Local. Huntingdonshire (Woodwalton
Fen) (Griffiths, 1963a:
128; Spencer, 1972b: 29)
and Cambridgeshire (NBN
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elsewhere: Germany, Sweden (Spencer,
1976: 60) and Estonia (Martinez in Fauna Europaea).
NBN Interactive Grid Maps of known host species:
British and Irish Parasitoids in Britain and elsewhere: Currently unknown.