Phanaeus vindex, the rainbow scarab, is a North American dung beetle, with a range from the eastern US to the Rocky Mountains. The head is a metallic yellow color, and males have a black horn which curves backward toward the thorax. Both sexes have yellow antennae which can retract into a ball on the underside of the head. The thorax is a shiny coppery color, with yellow or green on the sides. The abdomen is metallic green. The underbelly is black and green. Body length is about 2–3 cm.
Rainbow Scarab Beetle

Judy Gallagher
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Flickr