Subject: Monster bug
Location: Twentynine Palms, CA
July 1, 2012 11:40 am
I occasionally see these monster bugs at night during the summer. I managed to get daytime photos of an injured one. It was on my patio in Twentynine Palms, CA. I’ve seen bigger ones before. I used a metric scal and also a tape measure in inches. Can you please tell me what it is? Thank you.
Signature: Gail McCormick

Palo Verde Root Borer

Hi Gail,
This impressive beetle is a Ponderous Borer,
Trichocnemis spiculatus.  According to BugGuide:  “Grubs are found chiefly in ponderosa pine and Douglas fir”

Correction:  Palo Verde Root Borer
Seems we were hasty in our identification and when that happens, we sometimes make mistakes.  Thanks to a comment from a reader, we have made a correction.  See BugGuide for confirmation.


Location: California

2 Responses to Palo Verde Root Borer, not Ponderous Borer

  1. mct5548 says:

    Not Trichocnemis spiculatus. Actually Derobrachus hovorei

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