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Trichodezia albovittata
Tiny brown moth with a white stripe on each wing
Spruce-fir forest
Geometridae, Larentiinae, Asthenini, should be Trichodezia albovittata, so it is actually a moth, not a butterfly. You might note the filamentous antennae. Butterflies usually have clubbed antennae.
http://bugguide.net/node/view/157833/bgp...
http://bugguide.net/node/view/6821/bgima...