Bug ID

Saw a bug on a Cosmos a bit ago that is the size of a yellow jacket bee, same coloring as a bumble bee, in fact if you saw it quickly thats what you'd say it was, a BB. Tail is a bit longer and more slender than a bee & comes to a sharp point (no stinger I could see) and it has HUGE black round portruding eyes. Has wings etc. I've never seen the like before. Any idea what it is - good - bad or just a bug<G>?
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