About Western Boxelder Bug
A red and black bug very similar to the eastern boxelder bug but found in western North America. It forms large overwintering aggregations on buildings and fences near boxelder trees. It is a nuisance pest but causes no structural damage.
Did You Know?
When crushed, it stains fabrics and surfaces with a reddish-orange dye from its body fluids, which is why it should be vacuumed rather than squashed when found indoors.
How to Identify Western Boxelder Bug
Western Boxelder Bug (Boisea rubrolineata) belongs to the order Hemiptera, family Rhopalidae. Adults typically measure 11-14 mm.
Western Boxelder Bug Habitat
Western Boxelder Bug is found in woodlands habitats, particularly across Western North America. This species has adapted to thrive in its preferred environment, where it can find suitable food sources and shelter.
Western Boxelder Bug Diet and Feeding
Western Boxelder Bug feeds on seeds and grains. Seed-feeding insects can influence plant populations by consuming seeds, and some play a role in seed dispersal.
Where Is Western Boxelder Bug Found?
Western Boxelder Bug can be found in Western North America, where it inhabits woodlands environments. Its distribution is influenced by climate, food availability, and habitat suitability.
Distribution Map
Where Western Boxelder Bug can be found
Is Western Boxelder Bug Dangerous?
Western Boxelder Bug is generally harmless to humans. It does not bite or sting and poses no significant health risk. Like most insects, it prefers to avoid human contact and will typically flee rather than confront a perceived threat.
Western Boxelder Bug Role in Nature
Western Boxelder Bug is part of the food web as a primary consumer, feeding on plant material. It serves as an important food source for birds, bats, amphibians, and other insectivores, connecting plant energy to higher trophic levels.
Seasonal Activity
Frequently Asked Questions About Western Boxelder Bug
What does Western Boxelder Bug look like?
The Western Boxelder Bug typically measures 11-14 mm.
Where is Western Boxelder Bug found?
The Western Boxelder Bug is found in Western North America and typically inhabits woodlands environments.
What does Western Boxelder Bug eat?
The Western Boxelder Bug feeds on seeds and grains.
Is Western Boxelder Bug dangerous to humans?
The Western Boxelder Bug is generally harmless to humans. It does not bite or sting and poses no significant health risk.
What is an interesting fact about Western Boxelder Bug?
When crushed, it stains fabrics and surfaces with a reddish-orange dye from its body fluids, which is why it should be vacuumed rather than squashed when found indoors.
Cite This Page
APA:
InsectDiscover. (2026). Western Boxelder Bug (Boisea rubrolineata). Retrieved from https://insectdiscover.com/insect/western-boxelder-bug
MLA:
"Western Boxelder Bug." InsectDiscover, https://insectdiscover.com/insect/western-boxelder-bug.