Greetings from North Idaho. Last week I happened to be in a feed store in Spokane Washington and saw these laminated brochures at the checkout stand. One of these were on butterflies in the pacific Northwest. I picked one up because we have so many species of butterflies around our place that I wanted to know them better. (photos and text was by David G James).
These excellent photographs seem to match best with on called Old World Swallowtail. There are 4 other Swallowtails listed, but this one seems to match best. It is listed as Oregon State Insect.
Very beautiful