It is not a beetle, but an assassin bug.
Reduviidae, Harpactorinae, Zelus longipes.
https://en.wikipedia.org/wiki/Zelus_longipes
http://bugguide.net/node/view/580836/bgpage
http://bugguide.net/node/view/641750/bgimage
http://bugguide.net/node/view/676978/bgimage
http://bugguide.net/node/view/4832/bgimage
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