222 



THE PROTECTION OF WOODLANDS. 



and removing infested poles ; smearing butts of young Poplars with 

 patent tar or cart-grease where the pest is known to be. 



Fig. 55- 



Pine Sawfly. 

 a. Mcile (twice magnified). 6. Female (twice magnified). 



Caterpillars at work ; on right a cocoon 

 (natural size). 



Damaged twig of Scots Pine. 



III. MEMBRANE-WINGED INSECTS (Hymcnoptera). 



A. SAWFLIES (Tcnthredinidce). 



* The Pine Sawfly, Lophyrus pini (Fig. 55), chiefly attacks Scots and 

 Austrian Pine, the caterpillars devouring the leaves till the tree is de- 



