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Oncopeltus fasciatus
approx. 1 inch, underside similarly colored
spotted on sunflower leaf
I've seen two examples, but both were marked as 'unidentified'.
When this bug is a nusiance, the best way to get rid of him is to take a pail of soapy water and shake the bush he is on with the pail underneath. They will drop into the soapy water.