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Hej Kabalm,
I think that your specimen is belonging to Oxycera rare. Females of this species might sometimes have a small pair of lateral spots on tergum 2. This character is unfortunately not taken into account in keys. I observed such females and it is noted as well in literature by Rozkosny (Rozkošný, R., 1983, A Biosystematic Study of The European Stratiomyidae (Diptera). Vol.2. Clitellariinae, Hermetiinae, Pachygasterinae and Bibliography. Series Entomologica, 25. Dr.W. Junk, The Hague, pp. 1–431.: page 151).
Regards
Piet