I think it’s a beetle
But there are so many of them (See Haldane) that I really cant search through all your pix, especially because maybe they aren’t beetles. These are on what I think is an Angelica on the Mendocino Headlands in California, but I’ve seen the same guys on my wooden back fence.
Joe Hearst

Hi Joe,
These are Bordered Plant Bugs in the family Largidae, most likely the species Largus californicus. They are TRue Bugs, not beetles.

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