INJURING THE BRANCHES. 33 



The eggs of this insect are deposited early in sum- 

 mer in the crevices, and under the scales of the bark, 

 being fastened in place by a glutinous substance. In 

 a few days the larva hatches and bores through the 

 bark to the sapwood, in which it cuts broad, fiat 

 channels, and sometimes completely girdles the tree. 

 As it develops it bores farther into the solid wood, 

 and when fully grown again approaches the surface. 

 AVI icn ready to become a pupa it gnaws partially 

 through the bark, and then casts its last larval skin. 

 About a fortnight later the pupa changes to a beetle 

 which gnaws its way through the bark, and thus 

 completes the- cycle of development. 



Remedies. — The directions given above for the 

 Round-headed Borer are also applicable to this 

 insect. 



INJURING THE BRANCHES. 



The Oyster-shell Bark-louse. 



Mytilaspis pomorum. 



A piece of bark covered with the scales of this in- 

 sect is represented in Fig. 11. If one of these scales 



Fig. 11. Oyster-shell Bark-louse. 



be raised early in spring there will be found beneath 

 it a mass of yellowish or whitish eggs, which hatch 



