| Stem-mine: 
 Larva mining the stem. Pupation external. 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 an irregular ellipse of 9-14 
 minute round bulbs.
 Hosts in Great Britain and Ireland: Hosts 
 elsewhere: Time 
 of year - mines: Currently unknown. Time 
 of year - adults: Single generation. Distribution 
 in Great Britain and Ireland: Uncommon. Hertfordshire (Barnet) (Spencer,  1972b: 59) and Warwickshire (Combrook) (Robbins,  
 1991: 19). Distribution elsewhere: Widespread in continental Europe including Andorra,  Estonia,  Germany,  
   Latvia,  Lithuania,  The Netherlands (Fauna Europaea). Also 
  recorded in North America (Spencer,  
    1990). NBN Atlas links to known host species: British and Irish Parasitoids in Britain and elsewhere: Currently unknown. |