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Seedhead gall fly - Urophora quadrifasciata

Seedhead gall fly - Urophora quadrifasciata
Upper Arlington, Franklin County, Ohio, USA
June 21, 2009
Size: small
Small and boldly patterned black fly with a very obvious ovipositor. Staying on the buds of this plant fairly intently around noon on a sunny day near OSU's main campus.

another possibility, especially if this is a thistle bud
is , but you'll have to wait for an expert to verify either ID.

Wingtip black "V" and a clear gap maybe seems like this

"n n" vs. "m"

an even better fit!
sneakier than we both thought! Great match!

Yes, this one's wing pattern is right on!

And what do you know, what I thought was thistle, was, after closer consideration and following the links for quadrifasciata, actually (probably) Spotted Knapweed, which is that flies host plant!

Thanks John! (and John and Jane!)

Ah, sneaky fruit flies
So diverse! That wing pattern definitely looked like another fly to me, but your picture is right on, and it was walking around a thistle bud in a rather territorial manner (at least for the minute I watched).

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