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Shiny metallic species, blue, green, black, occur in several families and a thread on this topic referring to these species may be useful for initial identification. Here is #1:
Initially I thought this fly was a Lonchaeid because of its similarity to:
See: HERE. But it has too many dorsocentral setae.
It is a blueish-black metallic fly, length 7.5 mm (28 September, NB, Canada).

EDIT: Thanks Nikita and Kahis
#1 Muscidae: Hydrotaea sp., female