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Hydrophilus triangularis
Found in a parking lot after a HUGE rain. As you can see it is quite big.
Nice spotting. This is some kind of water scavenger beetle. They live commonly in streams, ponds, and lakes, but often come out during big rains or to breed.
I'm not sure this is the exact species, but it will give you somewhere to start.
http://bugguide.net/node/view/439826