[NatureNS] ID help

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From: naturens <nancypdowd@gmail.com>
Date: Tue, 1 Sep 2015 12:00:20 -0300
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This Syrphid? Wasp? or? was on the window screen at 7:30am this morning. It was pumping the rear segments of its abdomen rapidly in and out:
https://www.flickr.com/photos/92981528@N08/20874473299/in/dateposted-public/

It looks like some of the Syrphids on BugGuide but nothing I see quite matches. Would anyone know an ID? Details below image.

Thanks, Nancy

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