Euphydryas editha
Thank you bayucca for the ID!
I crossed off Taylor's Checkerspot (Euphydryas editha taylori) since it is listed as endangered species and there are only three known populations in WA, which contain fewer than fifty individuals according to the survey conducted in 2002 (http://www.butterflyrecovery.org/species...). So I'll go with your suggestion Editha's Checkerspot. Thank you!
According to BOA Taylor's Checkerspot is actually Euphydryas editha taylori, a subspecies from Editha. But there are tons around and all also very variable. A little bit confusing are the colors af the antennae tips which in yours are yellow without any (at least visible) darker parts as you might see in other Editha. So, you have to check my suggestion very carefully. These Checkerspots are a tricky genus!
http://butterfliesofamerica.com/t/Euphyd...
Also Editha with yellow clubs: http://bugguide.net/node/view/685856/bgi...
http://bugguide.net/node/view/554541/bgi...
Lat: 46.91, Long: -121.64
Spotted on Sep 3, 2012
Submitted on Sep 13, 2012