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It is an image of Russian photorafer.
Penza (Central European part of Russia), end of september.
Boren and me agree that prey is Scathophaga (stercoraria?).
Boren think that victim is also Scathophagidae.
I think that victim looks rather like Opomyzidae.
Who is right, please?

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No vibrissae, one reclinate orbital seta, strong proclinateocellar setae: You could be right with genus Opomyza but let's wait what Jan Willem thinks. One thing is certain: no Scathophagidae (or other Calyptrate for that matter).

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Hi!

The victim (prey) is not a scatophagid, but I cannot say for sure which family it belongs to. The predator is a scatophagid just as you say.

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As far as I can judge from the picture, it doesn't look like an opomyzid to me.

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My 'instant instinct' said Pallopteridae, but I cannot give a single reason why :)

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1. Writing "victim" I meaned "prey", writing "prey" I meaned "predator", I'm sorry. Fortunely, you understood me anyway!
2. Paul, Kahis and Jan, thank you for your replies.
3. To Kahis: I didn't regard the possibility of Pallopteridae. I thought that 30.09 is too late for them.
Nikita

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Hi Nikita,

I have to admit that I don't know which family the prey belongs to, but you shouldn't rule out Pallopteridae because of the date. It's not too late for them!

Jan Willem

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Hi Jan.
Yes I shouldn't. But I used "past", it was selfexplanaition why the idea of Pallopteridae didn't come to my mind. And how easy to overlook probably right answer.
After Kahis message I discovered that my own photo of Palloptera (venusta?) dated 24.09. So I have to be the last person to rule out Pallopteridae because of date;)

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Boren send me two more image of prey.
It seems to me that there is strong costal spines.
Heleomyzidae?

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Hi Nikita,

Are you sure both pictures are from the same species of prey? The first one certainly seems to have distinct (rather strong) bristles on the costa. These strong bristles are not present in Opomyza. The second picture, I have to admit, looks like a specimen of Opomyza florum to me. If the two specimens really belong to the same species then I have to admit that I seem to be making serious mistakes lately:(.
The specimen on the first picture has distinctly darkened tarsi, which I have not seen in Opomyza florum for as far as I can recall. However differences in coloration of the legs between specimens of the same species is not al all uncommon in Opomyzidae (at least not in the genus Geomyza).

Jan Willem

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Hi Jan.
As far as I understoot Boren (and I think that I understood him correct):
1. Scathophaga with prey.
2. Details
2.1. Up - The fly, victim in future - a minut before bieng captured by Scathophaga.
2.2. Down - Scathophaga legs under wing (with black crossveins) of victim.

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It is funny, but my main doubt against Kahis's theory was: it can't be Pallopteridae, otherwise Jan Willem "smell his family".
After some addidional thinking I can tell - I eat my hat if it isn't Heleomyzidae!

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2.1 and 2.2 are not hte same species. I agree with Jan Willem (and everyone else) that 2.1 is Heleomyzidae (genus Suillia) and that the second one is Opomyza florum. The strong spines on the costa and setae on the legs seen in 2.1 are not present in 2.1 and 1, respectively. So 2.1 was NOT the furture prey!

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1. Realy, digital camera data show that time gap between 2.1. and 1. was 36 min, not 5 min.
2. Than thank you Paul and Jan, you were as usualy right, even with uncorrect question. Boren and me have to exuse for this unwilling mistification. Two flies look rather similar on first glance.
3. I hope that one day Boren will send to Diptera.info his images himself. He is a good photografer:
http://macro.internity.ru/glr/displayimage.php?album=lastcom&cat=-23&pos=52
for example.
Nikita