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Hi Eric,

I remember I read something similar in the german Wikipedia-Entry for D. obliterata:

https://de.wikipe...obliterata

Unfortunately, only the german version mentions that "the apical sections of the femora are noticeably red, which distinguishes the species from the very similar species D. finlandica".
I hope my translation is correct, but of course, generally, the reliability of Wikipedia entries can be questionable.

This publication here mentions at least three criteria to distinguish the two species:

Sciomyzidae Fallén, 1820 (Diptera) collected in the Mercantour National Park, France
Jean-Claude Vala, Christopher D. Williams 2015

Citation:
"The species (Dichetophora finlandica) has been often confused with the second Palaearctic species mentioned below. However, it differs by the presence of only one pair of post-alar setae, the third antennal segment elongated and very acute, and the yellow femur III."

I am in no position to judge if these claims are valid or not, even though I am still wondering, why I found that specimen in a garden at the perimeter of a huge city like Munich. No streams/ponds in the immediate vicinity, as far as I know.

Greetings, Uli