10/15/2018
Bugs on outside wall of our house
They are: Western Box-elder bugs
( Rhopalidae Boisea rubrolineata)

info in email from:
Joshua Vlach
Entomologist
Oregon Dept. of Agriculture

These are Western Box-elder bugs, a native species. They are not harmful. They feed on box-elder trees, maples, and sometimes ash. They are typically noticed because they overwinter in large groups in sheltered areas, including houses. In the spring they emerge again in large numbers, sometimes showing up inside homes as they try to find their way outside. We don't recommend spraying or trying to control them. Just sweep them up and put them outside. You can hose them off the outside of your home, but they will return. It will happen again next year, too.