Sugar maple borer, Plagionotus speciosus Say 



1 Ridges of bark formed over recent borings 



2 Exposed dead area showing the conspicuous grooves made by the grubs 



3 Ridging and cracking of bark over a badly wounded area 



4 Section of dead trunk showing borings and exit holes of the pigeon 



Tremex, Tremex columba Linn, and the smaller holes of its 



parasite, the lunate long sting, Thalessa lunator Fabr. 



3384 



