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I normal do no Pipunculidae (only Anthos..), so a strange side way for me.
D. canadensis is Nearctic, wich I know now, thanks to you.
I studied Sack again and D. xanthopus seems a good option for now, the descriptions of the typical characters fit.
Also the last antennal segment is black in D. canadensis, so it would be wrong after all.
(would you like to have the European key from Pius Sack from 1935 in pdf….it is old and not very updated, but with good descriptions of the species though).

Johanna