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The wheel bug (''Arilus cristatus''), in the family Reduviidae, is one of the largest terrestrial true bugs in North America, being up to in length. A characteristic structure is the wheel-shaped pronotal armor. They are predators upon soft-bodied insects such as caterpillars, Japanese beetles, etc., which they pierce with their beak to inject salivary fluids that dissolve soft tissue. Because most of their prey are pests, wheel bugs are considered as beneficial to the garden as ladybugs. They are also known for eating stinkbugs. Wheel bugs are common in eastern North America, although many people in the region have never seen them. They are camouflaged and very shy, residing in leafy areas and hiding whenever possible.〔(Wheel Bug - Scientific Name, Classification, Taxonomy, North American Reach and Size )〕 They have membranous wings, allowing for clumsy, noisy flight which can easily be mistaken for the flight of a large grasshopper. The adult is gray to brownish gray in color and black shortly after molting, but the nymphs (which do not yet have the wheel-shaped structure) have bright red or orange abdomens. ==Characteristics== The wheel bug has a characteristic dorsal crest, shaped like a wheel or cog. It moves and flies slowly, and in flight produces a noisy buzzing sound. As with other assassin bugs, its proboscis arises from the anterior end of its long, tubular head and unfolds forward when feeding. The bug plunges its beak into its victim, pinning its prey with its front legs. It then injects enzymes into the victim, paralyzing it and dissolving its insides, and proceeds to drain the resulting fluids. The wheel bug is also noted to be very vicious in the wild, and cannibalistic behaviors between them have been noted; for example, nymphs may prey on one another and the female may feed on the male after mating is concluded. It possesses two scent glands (red-orange in color) that can be everted from its abdomen, usually in reaction to being disturbed. The scent produced by it is not as powerful as that produced by the stink bug, but is still strong enough to be detected by humans. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「wheel bug」の詳細全文を読む スポンサード リンク
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