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Hi,
There is no modern key for this complex of species. It includes three very similar European species (all with yellow mesoscutum and a median vitta): E. dimidiata Mg., E. mesogramma Loew and E. divisa Loew. You could find them in Lindner's "Die Fliegen, S. 401" (Rhagionempis =Leptempis), where E. monogramma Meig. = E. mesogramma Lw. and E. scutellariae Bezzi = E. dimidiata Mg.
Best wishes,
Igor