Boxelder Bug
Scientific Name: Boisea trivittata
Category: insect
Brief Description
A common black and red true bug often found congregating on sunny surfaces and buildings in autumn.
Characteristics
Approximately 1/2 inch long, dark brownish-black bodies with distinctive reddish-orange margins on their thorax and wing veins. They have bright red eyes.
Habitat
Found near boxelder, maple, and ash trees where they feed on seeds and leaves, frequently moving to sunny exterior walls of buildings to overwinter.
When to Find It
Most commonly seen outdoors in spring and summer, and congregating on warm, sunny vertical surfaces during autumn.
Conservation Status
N/A
Ecological Role
Acts as part of the food web for various predators like birds and spiders, and feeds primarily on the seeds of boxelder, maple, and ash trees.
Easily Confused With
Red-shouldered bug (Jadera haematoloma), which can be distinguished by different red patterning and host plants such as goldenrain trees.
Observation Tips
Look for them on the sunny side of rocks, boulders, pavement, or tree trunks on crisp autumn days.
Interesting Facts
Boxelder bugs do not bite, sting, or transmit diseases, but they can become a household nuisance and can stain fabrics if crushed.