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Syrphid guide?

I am trying to identify the syrphids I collected this past summer. My supervisor told me there was a key to syrphid species online somewhere but I just can not find anything helpful. If anyone has some ideas, I would gladly appreciate them.

My flies are from Ontario, th
My flies are from Ontario, thanks for the link.

I think
The Manual of Nearctic Diptera is still about the best you can do to get to genus.

Have you checked this one?
Links to Species Pages for the Field Guide to the Syrphidae of Ontario

which area should be covered by the key?

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