Boxelder Bug
Scientific Name: Boisea trivittata
Category: insect
Brief Description
A common true bug recognized by its dark slate-gray or black body accented with striking red-orange lines along the edges.
Characteristics
Adults are about 1/2 inch long, elongated, and flat-backed. They feature black or dark gray wings with distinct red veins and red margins on the thorax.
Habitat
Found near boxelder trees, as well as ash and maple trees, often congregating on sunny sides of rocks, walls, and buildings in autumn.
When to Find It
Most frequently observed in large numbers during autumn and warm spring days as they seek sunlight or overwintering sites.
Conservation Status
N/A
Ecological Role
They feed primarily on the juices of seeds, leaves, and stems of boxelder, maple, and ash trees, serving as part of the food web for local insectivores.
Easily Confused With
Red-shouldered bug (Jadera haematoloma), which has a more triangular red marking behind the head; distinguished by range and specific red pattern.
Observation Tips
Look for them basking in large aggregations on sun-warmed rocks or the sunny sides of wooden structures.
Interesting Facts
Boxelder bugs do not bite, sting, or transmit diseases, but they can become a household nuisance when they enter homes looking for warmth.