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Thanks, it looks like the correct id. I like that bugguide site, very nice. I do have several birch, which I guess it must have fallen from.
How did it get to the West Coast? [quote]Range: Eastern North America from Ontario south to Gulf coast, west to Colorado plains and central Texas. [/quote]
Sorry, I should have looked at your location. Yours will be the Western Tiger Swallowtail (Papilio rutulus). The bugguide site did not have any caterpillar pictures for the Western, but here is a picture I found on the web. It is very like the Eastern's caterpillar. http://gallery.insect.cz/details.php?image_id=2067&l=thai
Thanks again. I did some searches and could not come up with anything like that. Interesting that it is a Checkoslovakian site with a photo of a caterpillar from Whistler, British Columbia. The internet is truly amazing.