A pest of boxelder when grown as a shade tree.
Adults are brownish-black with three red stripes on thorax.
Veins of the wings are red. Insects are more or less flat and oval and around one-half inch in length. Boxelder Bugs feed on the female flowers, fruits, foliage, and twigs of ash and several other species of plants. They are regarded as a household as well as an outdoor pest as they swarm inside during late fall.