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This is the 5th instar nymph of the brown marmorated stink bug. accidentally introduced into the United States from China or Japan. It is believed to have hitched a ride as a stowaway in packing crates or on various types of machinery.
Spotted on a fern in mixed woods.
As with all immature stink bugs, the nymphs lack fully developed wings and have been described as tick-like in appearance, ranging in size from 2.4 mm (1st instar) to 12 mm (5th instar). Nymphs need to molt, or shed their outer skin (exoskeleton), as they progress through five different stages or nymphal instars. First instars are colored orange or red and remain clustered around the egg mass, sometimes until they molt to the 2nd instar stage. The 2nd instar begins to develop an almost black appearance, and subsequent instars (3rd, 4th, and 5th) begin to acquire more of the adult BMSB coloration.