Western Boxelder Bug

what kind of bug is this?
December 23, 2009
I would like to find out what kind of bug we found in our back porch. It was found In oregon during September, by itself outside on a warm cloudy day. Specifically we are in the mid willamette Valey about 1 mile from Willamette River. We are in a rural area
Josh Hoffert
Independence, OR. Mid willamette Valley. 1 mile from the river.

Western Boxelder Bug
Western Boxelder Bug

Hi Josh,
This is a Western Boxelder Bug, Boisea rubrolineata, a benign creature that often forms large aggregations and enters homes to hibernate as cooler weather approaches.  It can become a nuisance if it gets too plentiful.

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BugMan aka Daniel Marlos has been identifying bugs since 1999. WhatsThatbug.com is his passion project and it has helped millions of readers identify the bug that has been bugging them for over two decades. You can reach out to him through our Contact Page.

1 thought on “Western Boxelder Bug”

  1. I saw a few Western Boxelder Bugs on my patio in Chatsworth, CA a few weeks ago, but today when I walked out in my yard past the patio they are all over!!! This is the first year I have ever seen them at all. There are a ton of smaller red ones and plenty of the bigger black and red ones. I have lived in this home for over 30 years and never seen them before this year!

    Should I be concerned,



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