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I needed to check my book at the office before I could reply but it is rather confusing. According to the European key, S. nigripes should have wings with a rather milky appearance, which seems to be visible in the top picture; but according to the description in the same book, S. nigripes should have a dark scutellum. With none of the other relevant characters visible (unless you can provide more pictures or a specimen) I would rather put it down as S. sphondylii as a milky appearance might be more easily wrongly interpreted than the reddish orange scutellum. ;).