The adult wheel bug is a large insect, about 25 to 36 mm (1 to 1.5 inches) in length. It is brown to gray in color with a distinctive notched, semicircular crest on its thorax. It has a long neck, narrow head, bulbous compound eyes, and long antennae. Females are typically larger than males. Young nymphs are somewhat spiderlike in appearance, with black spindly legs and a red abdomen.
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