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This is either E. diversilineata or E. gracilineata. They have very subtle differences, and many can only be determined by size, and even sometimes with a size, they need to be genetically examined. Looking at pictures on BugGuide, I am leaning towards E. gracilineata.
E. diversilineata:
http://bugguide.net/node/view/233988
E. gracilineata:
http://bugguide.net/node/view/336194