Used to feel and to find food. Head Antennae Used to feel and to find food. Head The first of the three sections of the caterpillar. Thorax Middle section of an insect’s body. Abdomen Rear section of an insect’s body. ? ? ? ? ? ? Spiracles Small breathing holes. Simple Eyes Used to see light and dark. ? ? ? ? Mandible The jaw of the caterpillar. The spinneret is located near the mouth and is used to make silk. True Legs The first three legs of a caterpillar that will become the butterfly’s legs. Prolegs Act as suction cups when walking on a smooth surface. Claspers Hooks that attach to silk pad when a chrysalis is formed.