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Mediterranean vegetation, near a river.
Madrid (Spain), 21/6/15

Regards,

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Different species of Dolichopodinae, two Hercostomus and a Dolichopus.

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Thanks John. What part of the insect I have to photograph to separate both genera?

Edit: I had understood you wanted to tell me the possibilities were that the fly was or Hercostomus (two possibles species) or Dolichopus (one species), but now re-reading your answer I think that in fact you are saying that there are different species in the photographs, being Hercostomus in the first and second photographs, and Dolichopus in the third one. I took the photographs in the same area with an interval of twelve minutes only, to different individuals, but I thought all was the same. Can you confirm this last interpretation is correct?

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The second fly is a Hercostomus. The third fly is Dolichopus. I distinguished them by wing veins.

I thought the first was Hercostomus but now I think Dolichopus. The angle is a good one because it shows the male genitals.

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Nice pictures, but I can not add anything more to John Carr. Put more pictures here, then continue discussion.

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If the first and third flies are the same species you may be able to identify it from the combined views. I do not have literature for Spain. Keys to species traditionally start with leg color (yellow, with tip of hind tibia black), postocular hairs (white, not black), antenna color (all black), and shape of bend in vein M (two right angled turns). Then some speies are separated by male secondary sexual characters (none obvious in your photo).

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Thanks John and Igor. I have some other photographs but I'm not sure they contribute to make things clear, but in the doubt I upload them. I'm not very sure with the identity of the diferent individuals, but I think they are what I say in the next posts.

This is the same as the first photograph.

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This is another shot between photo 1 & 2. Maybe the same individual that in some of that?

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Another shot.

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Sorry. I don't have any other shot of individual from photo 2.

And these are (I think) of the same individual from photo 3.

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Dear Jfdocampo, sorry, your photos have no any hard character to diagnose the species. I can guess (50/50) that this is the commonn in the Mediterranian Dolichopus griseipennis Stannius, 1831.

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Thanks Igor. Then the second photograph I uploaded on 22-11-15 is Hercostomus and all the rest, the two other photos from that day and the photos I uploaded on 24-11-15, are all Dolichopus cf. griseipennis. Right?