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Papilio rutulus
This looks more like the Two-tailed Swallowtail (Papilio multicaudata) to me. The wings on the Western Tiger are more tapered, and though hard to see due to high contrast, I believe I see two tails.
yes, i corrected my post. I was just helping someone from Mich. with an ID and typed the wrong thing.
Nice spot! Welcome to Project Noah!
Edward, the Tiger swallowtail indigenous to the west coast is Papilio rutulus, the Western tiger swallowtail.