S2 



their wintet quarters, and the applications should he 

 renewed from time to time during the summer. 



Removing the outer hark to expose the gruhs and 

 stimulate the activities of the trees, as suggested in treat- 

 ing the elm-horer, may be found effective for the pine 

 hark heetles also, as M. Robert's experiments were made 

 with reference to checking the injuries of a closely related 

 insect, belonging to the same family. 



The Maple Bark-Louse. 



(Palvinaria innumerabilis). 



Pi 



l-\ h.f' Jli'^ 



Fig. 14. Maple tree bark-louse, a, on the leaf; 6, crowded together 

 on a twig. (Prom Riley). 



This is the insect that may be seen forming white cot- 

 tony tufts on the twigs of maple trees along our streets in 

 early spring. It is one of the scale-insects, and does its 

 mischief by puncturing the leaves and* abstracting the 



