PLATE XXXIX 



Fig. I 

 Fig. 2 

 Fig- 3 

 Fig- 4 

 hatched 



— Leaf showing work of four Agrilus beetles in 24 hours. 

 ■Hole in bark made by adult Agrilus in emerging from pupal cell. 

 Lar\'£e of Agrilus bilitieatus and their burrows. 



Complete burrow of a larva of Agrilus biliiieaius. A, Point at which larv-a 

 B, beginning of second instar; C, beginning of third instar; D, beginning of 



fourth instar: E. pupal cell. 



