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If the first and third flies are the same species you may be able to identify it from the combined views. I do not have literature for Spain. Keys to species traditionally start with leg color (yellow, with tip of hind tibia black), postocular hairs (white, not black), antenna color (all black), and shape of bend in vein M (two right angled turns). Then some speies are separated by male secondary sexual characters (none obvious in your photo).