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Photo#97827
Tan borers - Ips grandicollis

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

Moved
Moved from Scolytini.

Moved

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.

 
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.

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