So you see, insects that can smell very, very much better than we would be greatly influenced by the odors of other insects.
Some of the stink bugs, although so disagreeable if disturbed, are very useful to us, as they eat other insects injurious to vegetation.
Most of them, however, eat fruits and vegetables, and some species do a vast amount of mischief.
The Louse
Yes, John, lice are bugs, and very mean bugs too.
They have lived at the expense of other creatures so long that they cannot exist unless they have a living body to feed on.
Here is a picture of one very much enlarged. No wings, no beauty, a pale white thing, all claws and mouth.
It has a long sucking tube by which it pierces the skin, and a sucking stomach by which it pumps the blood into its mouth.