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Edit: perhaps it's not Syrphidae?

OK..i went through all 26 pages of gallery and I did find something close, however, none had a waist that slim! So what is this?

Location: Sungai Tua Recreation Forest, Selangor, Malaysia.

I rotated the image..it was a tree trunk actually


Ovipositing animation here: http://farm5.stat...7519_o.gif