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California Root Borer

Prionus californicus

Photo by Josh Asel
Published on Project Noah
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38.4021, -122.824

Field Notes

Description:

The members of this genus are large (25–70 mm) and usually brown or black. All members of the genus Prionus have twelve or more strongly toothed or even flabellate antennomeres on their large antennae.
Common North American species include the "Tile-horned Prionus", Prionus imbricornis, the "California root borer", Prionus californicus, and the "Broad-necked root borer", Prionus laticollis.

Notes:

I found this guy inside my car and then bumped him out onto the ground. This one was about 3 inches long but I've seen them at 4 inches. They are primarily red/orange, have long, pointy antennae, can fly, as you can see by those chompers, bite something painfully fierce, come out only at night, and make loud, ear splitting and scraping ree-ree-ree-ree sounds. I call them "Devil Beetles."

Species ID Suggestions

California root borer.

Prionus californicus

Comments (12)

Wow thanks so much everyone for the comments and suggestions! Lauren, it sounds like you've experienced one before? Looks nasty. And Karen, they should try again! I love that place.
These guys have an impressive bite! We had these guys on Mt. Diablo.
My parents almost bought a lot in bodega bay - can you guess they've been kicking themselves for not doing so, ever since?
I think it's a California root borer. Although 4" seems slightly larger than what I'm reading. It's definitely a longhorn beetle of some kind. http://bugguide.net/node/view/18548
I live in Sebastopol, closer to Bodega Bay. A lot of wildlife out here :)
I lived in the bay area for a few years, but don't remember seeing them!

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