SCALE-INSECTS, BARK-LICE, MEALY-BUGS, 245 
birds entirely. It is a crime to kill simply to show how good 
a person can shoot! 
In some cases contagious diseases come to our assistance and 
carry off large numbers of such destructive insects. As all the 
plant-lice and most of the scale-insects produce a sweet-liquid, the 
honey-dew, many other insects are invited; but most of them 
feed only upon this sweetness, not upon the insects themselves, 
hence are not beneficial. In fact some, like the almost omni- 
present ants even protect the plant-lice. Being*always present 
to obtain honey-dew, the ants are of some assistance by showing 
us that a tree is infested and that it is time for the owner to in- 
vestigate matters and to apply the remedies. 
True Bugs. After Brehm. 
