The brown marmorated stink bug (Halyomorpha halys) is an insect in the family Pentatomidae, native to China, Japan, and other Asian regions.In September 1998 it was collected in Allentown, Pennsylvania, where it is believed to have been accidentally introduced.
Adult brown marmorated stink bugs are approximately 1.7 cm (0.67 in) long and about as wide, forming the heraldic shield shape characteristic of bugs in the superfamily Pentatomoidea. They are generally a dark brown when viewed from above, with a creamy white-brown underside. Individual coloration may vary, with some bugs being various shades of red, grey, light brown, copper, or black. The term "marmorated" means variegated or veined, like marble,which refers to the markings unique to this species, includes alternating light-colored bands on the antennae and alternating dark bands on the thin outer edge of the abdomen. The legs are brown with faint white mottling or banding.