Well with out photos it's very difficult to help you out... even with the description you provide. Below are some links that may prove helpful to you... the third link is to a great web site that allows you to break down your search right down to the county you live in... hope you find what you want there.

Gerry

http://www.thebutterflysite.com/washington-butterflies.shtml
http://www.carolinanature.com/butterflies/orwaleps4.html
http://www.butterfliesandmoths.org/checklists