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1.6mm, Clitheroe UK, 24 July 2012.

A number of these very small flies around a bird dropping. At least one male aggressively defended territory - even had a head-to-head with a large Palloptera, but had to retreat when the big fly insisted on feeding.

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Many more pix if needed.

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Looks like Oscinellinae, would you please put some more pics about? (Pics are unclear for ID) :)

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Here are three more. What do you need to see?

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And another for luck! As you can see, there is more than one individual here. I saw at most three or four at the same time.

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Stephen! Would you please look at Costal vein for sure and tell me please, that is this vein reaching to M2+3?

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I think these two images show it.

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According the key, I arriving to Botanobia sp. This genus is very similar to Gaurax, as the key says. :@ Is there Botanobia in the list of your area? :)

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These are Gaurax (Botanobia isn't used as a valid name for any genus now; it has been used to refer to a few genera, depending on the literature source). I'm not terribly confident about the identity of the British species so I'll stick to genus.

Charley Eiseman photographed three species of Gaurax feeding on the same bird dropping in Massachusetts, USA (photos of all the species are on bugguide.net).

Terry

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Thank you so much Terry! |t:)