Pale Metanema
If this moth from the porch light on June 13, 2015 isn’t a Pale Metanema, Metanema inatomaria, it is certainly a dead ringer for it. I only got pictures of it in one pose and from one angle because it was in an awkward position for looking at it from another direction, but I think this picture is good enough to be worth leaving it full-sized (you can click on this to see it larger).
The caterpillars are grey-and-white stick-mimic inchworms that eat leaves from a variety of trees, including aspen, poplar, and willow. They overwinter as pupae, building their cocoons in tree-bark crevices. While the adult stands out pretty clearly on our house siding, I expect that it would be a lot harder to spot perched on the trunk of an aspen tree, which is pretty much the same shade of gray as the moth is.
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What a gorgeous soft gray!