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Photo#97827
Tan borers - Ips grandicollis
Copyright © 2007 Jim McClarin

Tan borers - Ips grandicollis
Nashua, Hillsborough County, New Hampshire, USA
March 1, 2007
Size: about 4.3 mm
I have never heard an explanation for why many borers have a sawed-off, spiny rump like these do.

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Tan borers - Ips grandicollis Tan borers - Ips grandicollis Tan borers - Ips grandicollis Tan borers - Ips grandicollis
Contributed by Jim McClarin on 11 March, 2007 - 10:07am
Last updated 1 April, 2012 - 3:29pm

Moved
Moved from Scolytini.
… v belov, 20 December, 2009 - 6:54pm

Moved
Moved from Bark and Ambrosia Beetles.
… v belov, 20 December, 2009 - 9:56am

Kind of like a bulldozer blad
Kind of like a bulldozer blade to push(back) material out of ther tunnels is what I have read and been told is the probable explanation.
… Richard Lareau, 11 March, 2007 - 11:41am

 
That makes sense.
I had never thought about an adult beetle needing to do this since in most species the adult's wood gnawing is just to escape the tree after eclosing and gnawing an egg-laying hole through the bark.
… Jim McClarin, 11 March, 2007 - 8:46pm

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