Hello,
Thanks to your well-designed site, I was able to identify the large beetle in my driveway as a Prionus californicus. This was in Orange, California on July 2nd, 2004. Thought I’d share my photo with you, in return for the quick and detailed information.
Thanks again!
Marc McNaughton

Thank you for your kind words Marc, and also for the high quality photo. The species, according to Essig: “ranges along the Pacific Coast from California to Alaska and is also reported from Arizona, New Mexico, colorado, and Nevada. Adults are nocturnal and fly in midsummer to fall. They are readily attracted to lights. The adults make a loud humming noise on the wing and often strike the windows at night with an impact that almost breaks them.”

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