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Photo#7867
Flower Fly - Chalcosyrphus piger

Flower Fly - Chalcosyrphus piger
Durham County, North Carolina, USA
October 8, 2004
Size: circa 8 mm
On Frost Aster, Symphyotrichum pilosum (or a closely related plant). The red abdomen is quite notable in the field. Small, probably circa 8 mm.

Thanks to Eric Eaton for straightening me out on the fly id. This is what used to be called Xylota pigra, and is now, apparently, Chalcosyrphus piger. Compare Xylota pigra at Insects of Cedar Creek. That species is listed in Brimley (1), p. 354, as ocurring in the eastern part of the state of North Carolina, March-November. Given its abundance in the North Carolina State University Entomology Collection, the correct season for this locality, and the distinctive appearance, I'm going to go out on a limb and say this syrphid is identified.

Syrphid fly
This is a syrphid fly. It used to be in the genus Xylota, but is now in a different one. No really good new references to syrphids that update the names! Maybe for my next book project....

 
Thanks, compare Xylota pigra (Chalcosyrphus?)
Aha, thanks. I was beginning to wonder about that right after I posted it.

Somewhat similar to Xylota pigra at Insects of Cedar Creek.
Nearctica.com has a Chalcosyrphus pigra listed, maybe that is it? NCSU has it listed, too, with 48 specimens. Or, maybe that is not it. They have Xylota species, including pigra, listed too, also with 48 specimens--maybe not a coincidence. Hmm. Taxonomic confusion reigns.

Chalcosyrphus pigra is on your list for the field guide. Could this be it? If it is, let me know, I have other shots.

I'll move it to some genus or another provisionally, I suppose, or maybe just leave it as a syrphid.

Patrick Coin
Durham, North Carolina

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