Phanaeus vindex, also known as a rainbow scarab (like other members in its genus), is a North American species of true dung beetle in the family Scarabaeidae. It is found in eastern and central United States (Florida and New England to Arizona and Wyoming) and northern Mexico. It is the most widespread species of Phanaeus in the United States and it has a wide habitat tolerance. It may hybridize with the generally less common P. difformis.

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