INSECTS. 



281 



Larch Aphis (Chermes laricis). — This pest occasion- 

 ally does a great deal of harm in larch plantations by in- 

 festing the shoots and foliage, and sucking out the sap. 

 The female lays her eggs in April or early in May at the 

 base of the leaf-stalks, at the rate of about five a day, and 



mp 



ON-\r^ 



HOLLY LEAF MINER FLY AND LARVA. 

 The croes lines indicate the natural size of the leaf. Below, the larva is 

 sliown of natural size and magnified, 

 by the larva. 



The blotch, on leaf ehows injury done 



these are covered by a woolly substance secreted by the 

 mother. From these hatch small blackish or violet larvae, 

 which afterwards change to a pale olive-green. Succes- 

 sive generations are produced from eggs up to autumn, 

 then a mother Chermes survives to lay eggs the following 



