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This surely is P. modesta (Meigen) since it has this characteristic "double spot" on the vein tp.

Which publication is your list based on? Already in an Swedish Ent. tidskrift (1990) article on Pallopteridae by Hugo Andersson there is the name P. modesta in use and P. umbellatarum (Meigen) is its synonym name (although also umbellatarum (Fabricius) is a good species).

But this really seems quite a puzzling taxonomical case because Meigen seems to have given two names for the same species...