Western Conifer Seed Bugs
The Western Conifer Seed Bug is often mistaken by people for either the Asian Longhorned Beetle, or for an Assassin Bug. It is a type of leaf-footed bug that feeds on seeds of trees, especially pine. It is not a destructive pest in the home, but merely a nuisance. They find their way into homes during the end of summer and early fall looking for a place to spend the winter. They emit a foul-smelling odor when disturbed, handled, pressed or crushed. Also, the sound of their wings while in flight resembles the buzzing sound of a wasp or hornet, which can be unnerving and startling when one flies past your ear or lands on you.
Additional Information: Western Conifer Seed Bug (Penn State)