What's That Bug? does not endorse extermination

Subject: Big Ol’ Larva – Carpenterworm?
Location: Raymond, California (Sierra foothills)
October 29, 2012 4:03 pm
We were splitting wood this weekend, and found this large larva inside one of the interior live oak rounds. We believe it to be a carpenterworm larva – can you confirm? As you can imagine, it was not happy to have been revealed to the world, so our size comparison with the measuring tape isn’t quite in alignment.
Love your website!
Thanks so much
Signature: Megan Ralph

Prionid Grub

Hi Megan,
This is the grub of one of the Longhorned Borer Beetles, most likely a Prionid, and possibly the California Prionus.  See this image from BugGuide for comparison.
  According to BugGuide:  “Larva feed primarily on living deciduous trees (oaks, madrone, cottonwood) and are also recorded from roots of vines, grasses, and decomposing hardwoods and conifers. Will also attack fruit trees growing on light, well-drained soils (e.g. apple, cherry, peach)”

What's That Bug? does not endorse extermination
Location: California

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