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Thanks a bunch for your reply, Paul!! :)

Definitely I cannot see a 'dark' scutellum in my fly :D:D About the wings, I see them slightly traslucent more than milky, but probably that is more a matter of a personal interpretation of the words in the key ;) Anyway, wings of other pictures of Saltella sphondylii look rather traslucent too. Pity there are no pictures of S. nigripes to compare :(

The thing would go towards: are there any other Saltella species in Europe that might fit my fly? The picture was taken in N Spain (closer to Europe climate than classical sunny dry Spain), it might happen that it is a new species for my country :o :D Kidding! ;)

If you tell me which details are needed to rule out nigripes completely, I can check if there is any other picture where it can be seen. But those two pictures, although no brilliant, are the best I managed to take :(