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Sept. 2012, Serbia, Batajnica

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Ephydridae

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Thank You, Roger

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Setacera (Bristle on outer face of left antenna is just visible.)

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Thank You, Tony
Since i am specialized more in moths, will You tell me, please;
which part of the fly is most important for identification.
Regards

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Tony might be able to give you some hints on how it might be possible to go further. But in general it varies between groups and species - an identification is usually made from a lot of very fine details. It is always best to take a lot of photos from different angles and in that way you might have shown some of the necessary characters. But in some species identifications from photos are impossible because we must see the genitalia (internal structures) or features that are hidden on surfaces that the fly doesn't show in life :)

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Thank You. I suspected, it would not be easy. I take pictures of the moths, mainly,
but very often, many flies come to my paper lamp with mercury bulb, sitting of a small table (table painted Kodak-gray, for latter color verification, during editing).
Flies are, as moths, very exited by UV radiation too, but unlike moths, flies would not
rest for more than few seconds.
In daylight, situation is even worse. Not an easy task!

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I can't add much to what Chris says. If it is identifiable from a photo, usually a dorsal and a lateral image are required. Frontal (face-on) can also be useful, but often the flies don't co-operate. As a rule, the more shots the better, but some groups are just too difficult - even with a specimen they can be very challenging! :o