What's That Bug? does not endorse extermination

Bug from Bartlett, IL
We found this bug on a tree in Bartlett, Illinois last August and have seen another few again this August. What is it? Great site; Thanks.
Jason Wilen

Hi Jason,
This female Pigeon Horntail, Tremex columba, has been photographed in the act of laying eggs. She uses her ovipositor to lay eggs inside th wood of dead or dying trees. The young are wood borers and they are preyed upon by another wasp relative, the Giant Ichneumon.

What's That Bug? does not endorse extermination

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