A few weeks ago I saw this white moth resting in a planter with pansies. It was so white and neat, and the planter so tidy and non-natural, and I thought they sort of fitted well together. I wrote to Bugguide.net (thanks for that one too, Jackie!) and in a few days they returned with the answer.
The White slant-line moth (Tetracis cachexiata) is maybe better known in its caterpillar form, where it tries really hard to look like a twig.
This picture I downloaded from google since I wanted to show what a completely different creature its larva is.
It feeds on many different kinds of trees, and can be found along the East Coast from Canada to Florida.