The mouthparts of adult insects can be of different types. In many species they are of the chewing type, for example in grasshoppers and beetles. Others have sucking mouthparts for example shaped like stylets in bugs and aphids or shaped like a coiled tongue in butterflies and moths. The different types of mouthparts determine how the insect feeds. The head of most adult insects bears a pair of antennae.
Antennae are very variable in form and size.
The thorax is the middle of the three body regions of an adult insect. It is composed of 3 segments. Some insects have only 1 pair of wings. Legs Adult insects have 6 legs. Each of the segments of the thorax bears 1 pair of legs.