black with red edge flat insect
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Your pictures show a specific variety of stink bug nymphs (the juvenile stage) in the Genus: Chlorochroa. You can find additional examples of these bugs here: https://bugguide.net/node/view/6978
And you can learn more about their biology and management here: https://agrilife.org/urban-ipm/2017/05/12/stink-bugs-have-you-seen-me/