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The Lorquin's Adminal butterfly shown here on a Queen Anne's Lace lives on forest fringes in Pacific Coastal states feeding on Nectar producing flowers, and using plants such as the Chokecherry or willow as a host tree.
Named after Pierre Joseph Michel Lorquin, a french naturalist during the California Gold Rush, it seems to be fairly common. The specimen here was found beside a trail at a Mt. St. Helens visitor center overlooking the Toutle River.
Additional information: see Wikpedia - Lorquin's admiral