Sugar maple borer, P 1 a g i o n o t u s s p e c i o s ii s Say 



1 Rids^es 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, T r e m e x columba Linn, and the smaller holes of its 

 parasite, the lunate long sting, Thalessa lunator Fabr. 



^384 



