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2 May 2008 NB Canada. Length: 4.3mm.
Superficially resembles Egle/Paregle from last year SEE HERE

Male

EDIT: ID corrected, many thanks to Michael Ackland.

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Anthomyiidae is right,anal vein reaching clearly in wing margin . :D
It could be an Egle or Paregle, I agree.

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Palpi seem to short for Egle.

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Yes, I overlooked the palps; indeed very short.
Blow-up of head.

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Is the arrow pointing to a blunt preapical spur on the fore tibia? If so, it is a species of Delia. Species of Delia are very numerous in the Nearctic, many can only be idenntified from the male genitalia

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Thanks. Yes the tibial spur does seem blunt compared to the one on the femur.

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nice tip for next time. :)

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Just to expand on this character: some species of Delia (males only) have a blunt spur, some a pointed spur, and some practically no spur. so it's not an absolute character for male Delia, but if there is a blunt spur then it's a Delia.

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Thanks Michael; does this image help to narrow down the group?

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This proves that one should not name anthomyiids from photos!! The genitalia are a species of Lasiomma, as sternite V, long pointed distiphallus, and laterally flattened apical part of the cercal plate (keel-like) indicate.

Now I shall have to check Nearctic Lasiomma to see if the bluntish spine is there! I will come back on this

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The genitalia photo is very similar to Lasiomma picipes Meigen. This speies is Holarctic. There is a Nearctic species, Lasiomma nidicola Aldrich which is very similar. I post my drawings of picipes as a PDF.

The blunt seta is a basal ventral seta in the tarsus, which most anthomyiid species have. The blunt seta or spur on some Delia species is a posteroventral apical (or preapical) seta on the fore tibia.

The photo of the fly is rather grey dusted, which made me think of Delia, but picipes is darker. Perhaps it is the lighting?

You may notice the tiny hairs on the tip of the cercal plate in my drawing? These are absent in nidicola, of which I don't have a drawing.

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Thank you Michael for all the effort/expertise you have put into this fly.
It is difficult to judge the exact shade of grey/black to reproduce on a photo. The fly was actually a lot blacker than in my image.
I have dorsally flattened, perhaps a little too much, the cercal plate. Are these 2 hairs at the tip of the cercal plate the ones indicative of picipes?

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Those are the small hairs! Amazing that these hairs seem to be constantly present, though I have no doubt that one could find a specimen in which they are absent.
It is your expertise in taking these photos is what enables me to speculate on the identity. Soon we won''t need to send the material halfway around the world.

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Thanks Michael. Another benefit of decent photos of the entire insect and the dissected genitalia is that it saves an expert, such as you, valuable time.