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Banasa calva
I'mm thinking you're correct. I found a link that showed Oregon and Washington as part of their range
Pentatomidae, Pentatominae, Pentatomini, Banasa sp. and I think it is Banasa calva. These guys are very variable! Please, verify!!!
http://bugguide.net/node/view/570678/bgi...
http://bugguide.net/node/view/342720/bgi...
http://bugguide.net/node/view/342721/bgi...
http://bugguide.net/node/view/163319/bgi...