What's That Bug? does not endorse extermination

Subject:  who is he little monster
Geographic location of the bug:  Araraquara-São Paulo, Brazil
Date: 08/19/2019
Time: 09:51 AM EDT
Your letter to the bugman:  Hi, I would like to identify these beetles, they were very big sizes about 10+ centimeters. People here are afraid of them and call them “big cockroach”.
Nearby there are eucalyptus trees and lots of sugar cane.
I would like to know if they are rare, because these photos are from November 2018 and since then I have not seen any more here (the first beetle is slightly smaller than the second).
The first question is: are they dangerous?
What is his life time? what does he feed on? and how is his larval state?
How you want your letter signed:  Kainã

Root Borer

Dear Kainã,
This is one of the Root Borers in the subfamily Prioninae, and it looks similar to
Ctenoscelis ater which is pictured on Coleoptera Neotropical, but there is no information on the site regarding this beetle’s life cycle.  There is an image but no information on Prioninae of the World.  There is one sighting on iNaturalist.

Root Borer

What's That Bug? does not endorse extermination
Location: Araraquara-São Paulo, Brazil

3 Responses to Root Borer from Brazil

  1. It seems to me that here in São Paulo, the only option is C. acanthopus:
    https://apps2.cdfa.ca.gov/publicApps/plant/bycidDB/wdetails.asp?id=286&w=n

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