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A syrphid fly on an aster (Asteraceae). Syrphid flies generally feed on aphids as adults, their larvae may also feed on aphids on plant leaves or live inside water. Look closely and you will see they have very short antenna (bees have longer ones), one pair of wings (bees have two pairs), and the wing venation of course is also totally different. Yunan, China. May 2001.
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