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Hebecnema can be difficult to id because all of the available material describes certain features differemtly. I've checked Hennig, then Gregor and Rozkosny for a description. Neither publications stress a male vitta as being very distinct. To quote the material: "Abdomen with a short black midline (often absent on tergite 4)." The femora are darek and the knob of the haltere is dark. I think that vespertina is a good match.

Maybe someone else has a better suggestion. I'm certainly not a Muscidae expert. I have a little experience with Hebecnema.

can you see pd bristles on the mid tibia? how many do you see?