INFESTING FOREST TREES. 

 1. THE PINE. 



AFFECTING THE LEAVES. 



Fixed upon the sides of the leaves, exhausting them of their juices; small 

 oblong flattish white scales, with a pale yellow spot upon their pointed 

 end. 



The Pine-leaf Scale-insect, Aspidiotus Finifolia, new species. 



In those sections of our country where it is not common as a 

 native of the forests there is scarcely any tree which is more 

 esteemed for ornamenting the grounds around a dwelling than 

 the white pine. Especially is it a favorite, and strenuous 

 attempts are making to cultivate it about houses upon the prai- 

 ries of the west; its tall growth and perennial foliage adapting 

 it so well for a shelter from the winds of winter which sweep 

 over those vast plains with such piercing severity; whilst by 

 many of the residents there it is further prized as having been 

 associated with the scenes of their early life, and thus reviving 

 pleasant remembrances of their childhood's home. 



But when it is transplanted the pine appears to be much more 

 subject to the attacks of insects than when it is growing sponta- 

 neously. At least we meet with some kinds of these depredators 

 upon cultivated pines, which we have never been able to discover 

 upon these trees when growing wild in our forests. One of these, 

 a species of coccus infesting the bark, and named the pine blight, 

 was described in my First Report. We come now to treat of 

 another insect of the same Family Coccid.e, which fixes itself 

 upon the leaves, exhausting them of their juices and thus causing 

 them to perish and fall, and the ends of the limbs to die when 

 thus defoliated. Specimens of the leaves, thronged with these 

 insects, were sent me by Robert W. Kennicott, of West North- 



