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Adelphocoris rapidus
Black bug with white line across shoulders. White border and blotches on wings. Long antenna with white at joints.
Found on a thistle seed head in an open conifer forest.
Unfortunately this guy seems to be of a few color and pattern varieties which makes visual ID hard. But I think it is this bug. Here is one of the photos from bugguide that looks most like your photo: https://bugguide.net/node/view/2017162/b...