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Yes, it not so easy to say which name has priority when they were published the same year. But as far as I can find out, Robineau-Desvoidy's publication is considered to be older than that of Meigen from 1830.
In his book, Rognes writes a bit about nomenclature regarding these two species, and to me his conclusions seems rather solid.
Therefore, I was surprised to see that Systema Dipterorum has another nomenclature.