stinkbug

Any of several insects, usually shield-shaped, possessing a gland that produces a foul-smelling liquid, usually containing aldehydes, which they use to discourage predators.
Any of various insects of the order Hemiptera (the "true bugs"), in the suborder Heteroptera, principally in the superfamily Pentatomoidea or Coreoidea.
(Southwestern, US) A pinacate beetle or stink beetle (genus Eleodes) that releases a pungent odor when threatened.