Arilus cristatus

Species of true bug

Arilus cristatus, also known as the North American wheel bug or simply wheel bug, is a species of large assassin bug in the family Reduviidae and the only species of wheel bug found in the United States. It is one of the largest terrestrial true bugs in North America, reaching up to 1.5 inches (38 mm) in length in its adult stage. It is sexually dimorphic, in that males are somewhat smaller than the females. A characteristic structure is the wheel-shaped pronotal armor. North American wheel bugs prey on caterpillars and beetles, such as Japanese beetles, the cabbage worm, orange dogs, tent caterpillars, and the Mexican bean beetle, all of which they pierce with their beak to inject salivary fluids that dissolve soft tissue. The North American wheel bug is most active in daylight, but may engage in predatory behaviors at night in areas illuminated by lights. Because most of its prey are pests, the wheel bug is considered beneficial.

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