APHIDID^E. 



331 



be seen from fig. 306, many of the young shoots die from the 

 attack. This fig. was photographed from a plantation which was not 

 in a very good state of health. If, as a rule, the health of the crop 

 is fairly good, the trees "throw off" the attack, and no appreci- 



able damage is done. 



Chermes corticalis (Kalt.) 



This species is very common in the south of England on Wey- 

 mouth pine,' and is said to do very great injury to the trees. It has 



Fi^r. 304. Chermes pini on 

 stem of young Scots pine. 



Fig. 305. 



-Chermes pini on terminal shoot of 

 Scots jjine. 



been notably sent me from the sandy soils of Surrey, and I have 

 found it bad on one tree in Kent. Fig. 307 is taken from a branch of 

 Weymouth pine in a garden in Cheshire. I have not found this 

 species in Xorthumberland, so that I am unable to give any descrip- 

 tion of the creature. 



