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Thanks a lot for the ID and the efforts you are making, Chris! And Policheta unicolor is listed as an Iberian species too! :D That is good news!!

About the colour, when we saw the fly we described it as 'the blackish Tachinid' not bluish. I think due to light, it looks more bluish in the pictures than it really is. It was more greyish than bluish, but definitely black.

I guess that if it is confirmed, Paul would like to have those pictures in the gallery ;)