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Speyeria Diana
Blue outer wing scales Blackish under scales
Temperate forest
Sorry, 14broy, but the blue morpho butterfly's range does not extend into the US, especially as far up as Maryland. Furthermore, the color pattern is actually opposite to the butterfly you've found, which is the red spotted purple.
Here's what a blue morpho actually looks like: http://en.wikipedia.org/wiki/Morpho_pele...