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Although these two images are not of a single fly doing press-ups (which would, however, be entertaining), I believe that they are the same species on the basis of being on the same - very small - pond on the same day (albeit three hours apart), and looking a little too similar for me to feel that they are likely to be vastly different species. I do, however, feel obliged to put both images up, because while one of them is so obviously stilt-legged that I will be very disappointed when I am inevitably informed that it is not Dolichopodidae, the one that is in better focus has managed to crouch in such a manner that its legs seem to be much more conservative, and forces me to question whether it is crouching or its associate is stretching its legs for a better view.

Apologies for yet another lengthy preamble, and details:

Place: Chongwe District, Lusaka Province, Zambia.
Habitat: Bulrushes/Nile cabbages on an ornamental pond.
Date: 24.10.2011
Size: 4mm?

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And second (Crouching) picture:

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Sciapodinae. Just for the record: the correct spelling of the family is Dolichopodidae.

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Thanks for the correction! Sorry for the error, I'm hoping it was a typo, and quickly correcting it in any case.

Also thanks for the subfamily!

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Could it be Condylostylus?

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The second one reminded me a lot of one of the American species groups of Condylostylus, but on closer examination I see the legs have few bristles. The long middle legs of the first are found in some species of other American genera of Sciapodinae. In Dolichopodidae similar male secondary sexual characters recur in unrelated groups.

I don't know if they are the same. I have seen different species of Condylostylus on adjacent leaves. At least three species groups live near me, possibly only three species but possibly more.

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Apical stylus and blackish wings vote for Chrysosoma, although posterior cross vein is not strongly sinuate.

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I'm afraid I only took the photographs shown, so this is the best I can offer for the wing: