a very long and straight corridor, only after a change of leaf,
blotch-like. Corridor first following leaf margin, turning round
at the apex, then blotch like and running towards the leaf base.
Frass often indistinctly delimited and faded, blackish green.
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).
Ackland in Chandler (1978)
did not indicate whether his host records were British or Foreign
and are therefore tentatively included under 'Hosts in Britain'
and 'Hosts elsewhere'.
Hosts in Great Britain & Ireland:
of year - mines: Currently unknown.
of year - adults: Currently unknown.
in Great Britain & Ireland: Widespread in Britain including Cambridgeshire (VC29),
East Ross (VC106), North Wiltshire (VC7), Oxfordshire (VC23), Surrey and West Norfolk (VC28),
NBN Grid Map:
elsewhere: Widespread in continental Europe including Andorra,
Czech Republic, Denmark, Finland, French mainland, Germany, Norwegian
mainland, Poland, Russia - Northwest, Spanish mainland and Sweden
(Michelsen in Fauna Europaea).
NBN Interactive Grid Maps of known host species:
British and Irish Parasitoids in Britain and elsewhere: