Back Food for Thought... If you plan on tying flies it is a good idea to know all the insect parts and proportions. They are often imitated in fly patterns. Why not pick an insect and see if you can plan your own unique fly?	The Head is the front part of the three body parts of the adult insect. It has eyes, the antennae and the mouthparts. Antennae The head of most adult insects has two antennae. Insects use the antennae to smell and touch things. Antennae can look very different from one insect to another. Thorax The thorax is the middle of the three body parts of the adult insect. It has three segments, with one pair of legs on each and usually two pairs of wings. Some insects have only one pair of wings. Legs Adult insects have six segmented legs. Often the last segment of the leg has a small claw. Wings Most adult insects have two pairs of wings, but some only have one (like houseflies). Usually the wings are very fine, thin and fragile but in some insects they can be thick and leathery. Abdomen The abdomen is the last (tail) part of the three body parts of the adult insect. It has eleven segments.