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Fly ID ? - Toxomerus marginatus

Fly ID ? - Toxomerus marginatus
Caney Creek, Stilwell, Adair County, Oklahoma, USA
December 4, 2013
Numerous small flies on dandelion flower.

Moved from ID Request.

Syrphidae, genus Toxomerus, I
Syrphidae, genus Toxomerus, I think Toxomerus marginatus based on the yellow margin around the abdomen and dark spot at the end.

Sure looks like it. Others on same flower exhibited brown dot at tip of abdomen but poor quality pictures.
This one looks like

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