Boxelder Bugs Boisea trivittata
Black bugs with red pinstripes, sunning in crowds on the warm south wall — boxelder bugs are harmless but relentless in fall, when they try to move into wall voids for winter. They don’t breed indoors; the fight is at the wall, not inside.
Signs you have them
- Clusters on sunny exterior walls in fall
- Stragglers around window frames indoors on warm winter days
- Red stains when crushed on fabric (don’t crush them)
What you can do today, free
- Vacuum indoor stragglers instead of squashing (stains)
- Seal gaps around window frames and siding trim
- Hose clusters off walls with soapy water on sight
Questions, answered straight
Do they damage the house?
No — they’re a nuisance in volume, not a destroyer. A fall perimeter treatment under the Pest Plan intercepts them before they overwinter in your walls.
Cockroaches 
Ants 
Spiders