I'm seeing a lot of these black shiny bugs on my rhubarb and sorrel leaves in my garden (is it coincidence that both of those leaves are high in oxalic acid)? I think it is a true bug, not a beetle but after hours of searching I can't find any image that looks like a black shiny bug with a prominent red spot on the back, or even any bug that looks similar. Given how many there are, I'd like to know if it's a good guy or a bad guy. The leaves have some small holes but there's no extensive damage that I can see several days after spotting them. I captured one in a bug box that is a 1" cube and will attached a couple photos. I live in the 97355 area code just south of Lebanon, OR.