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It seems to me that I've already posted a similar fly...
Anyway, this time the pictures are better .
Size 3.5mm.
When extended, its ovipositor is longer than half of the body.

[Subject edited - ignorantly labelled as Chloropidae]

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And the head.

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I don't think it is Chloropidae.
Lonchaeidae?

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Indeed.

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Thanks Nikita and Paul

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Hi Black

This is indeed a female Lonchaeid, the majority of species cant be told apart but this one is easier to identify - its Lonchaea fugax the "yellow footed lancefly" is there any chance that I can use some of these images for a forthcoming Handbook on the British species ?? you can contact me at iain.macgowan@snh.gov.uk ... Iain

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Many thanks Iain.