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I finally got a male of one of those species. But I am too unexperienced with those two to get right the relative gap between the eyes. Can any body tell me if it is possible to know the species? There are more pictures if is necessary.

Taken in the mountains of Madrid on August the 7th 2012.

Thanks for any help :)

PD: I suppose that I am right and it is indeed Musca sp. ;) :S

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A view of the abdomen, just in case.