Ten Lined June Beetle

Pacific Northwest backyard visitor
July 17, 2010
Location:  Pacific Northwest – North Seattle
Love your site.
Found this guest hanging on my doorjamb when I took the trash out the night before. When disturbed, he hissed. Came out the next morning and he was still there. I browsed your and other sites, but couldn’t come up with anything that quite resembled him. I also can’t seem to find any antennae – perhaps that’s why he’s still hanging around?
What is he?

Ten Lined June Beetle

Dear John,
Your beetle is a Ten Lined June Beetle,
Polyphylla decemlineata, or a closely related species in the same genus.  The antennae of this species are actually quite spectacular, though the individual in your photograph has not unfurled its antennae to their full extent.  You can see a nice photo on BugGuide of a Ten Lined June Beetle displaying its antennae.

Photo of author


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.

4 thoughts on “Ten Lined June Beetle”

  1. This Sunday morning, July 28th, 2013, on my front porch window screen facing south was a 3″ L 1.5″ W 10 lined June Bug with feather eyelashes. This was the biggest June bug I have ever seen. I live on Promontory Mountain in Chilliwack, British Columbia, Canada.
    I only saw one other one about 7 years ago. Where do they originate from. How come they would be here. The back drop of Promontory Mountain, evergreen trees and a lot of wild life.


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