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31 May 2007 New Brunswick Canada. Length 9mm.

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This is a female of Chalcosyrphus pigra (in Europe it is called C. piger) :D
Greetings

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It's a Chalcosyrphus, but I am somewhat surprised if this is the same species we call C. piger. My sole female of the latter species has all-black legs, no black borders on abdomen and no spots around the crossveins. Perhaps our syrphid gurus know better and this is just intraspecific variability.

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Dear Jere,
Yes, it is the same species, according to Spheight it also occurs in the Nearctic, where it indeed exists under the wrong name Chalcosyrphus pigra! ( Spheight 2006: This species is often mistakenly referred to in recent literature as C.pigra, a mis-spelling not mentioned by Peck (1988).)
I think indeed that the nearctic specimens are a bit different in coloration.
Greetings, Gerard

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I agree with Kahis, from the looks of it it's a diifferent species, not only are the legs 'the wrong colour' but also the very distinct markings in the wings, can't say I can recall ever having seen such clear markings in the Palearctic specimens, and I have seen quite a few...

John

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Well, you guys might be right, because I forgot the possibility that there could be other Chalcosyrphus species in the nearctic who look like piger (like this one does) but are a bit different.
This is what Chalcosyrphus piger in the nearctic seems to look like:
http://bugguide.net/node/view/26492
And indeed it has a different leg color, but also, in my opinion, very dark wings!
greetings,

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Perhaps C. libo B)

Edit: Ehh, probably not. The face color is different. Perhaps I should just shut up :D

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Why the edit? Perhaps you should speak out loud and clear :D C. libo looks like a much better match.

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Perhaps, but libo has light face, Tony's fly is black faced ... and there are 29 species of Chalcosyrphus.