13 



all other kinds which infest trees by the absence of legs 

 and of a head. 



Katydids and Grasshoppers (Order Orthoptera). We 

 have a number of katydids (though all do not have the 

 well known note that has given rise to the name) and 

 tree crickets in Kentucky that spend most of their time 

 among the foliage of trees. They are, however, usually 

 so scattered that but little apparent harm results from 

 their presence. Some of them, such as the true katydid, 

 are strictly tree-dwellers. The members of this order 

 have no grub state, but have the adult shape when 

 hatched, and chajQge subsequently only in size and by 

 acquiring wings. 



Trees Least Injured by Insects. 



It is evident to everyone accustomed to notice trees 

 closely that the species differ considerably in their sus- 

 ceptibility to insect attacks. Some, like the black locust, 

 the walnut, the apple and the soft maple, are generally 

 infested with a larger or smaller number of injurious in- 

 sects, without regard to locality, while others such as the 

 buckeyes and hard maple, are relatively but little in- 

 jured. And while it is true that as a general thing 

 insects attack by preference such vegetation as is most 

 nutritious and edible, and consequently likely to prove 

 useful to us, this fact is mainly of importance in consid- 

 ering plants which bear flowers or fruits of value, and 

 has not the same importance in considering shade trees. 

 A tree may present a fine appearance, and yet its leaves 

 and fruit be noxious. It does not follow though because 

 a, tree is not injured that it is in any way noxious to 

 man. Some of our very finest native trees would come 

 under condemnation if this were true. I have never 

 heard of anything hurtful in the leaves of the tulip-tree, 

 sweet gum, or sugar maple, all good trees for planting. 



