Final answer:
The statement that only adult ant-lions dig pits to trap prey is not true; it is the larvae that dig pitfall traps, while the adults are capable of flight and do not construct such traps. Therefore, the correct option is e.
Step-by-step explanation:
The statement that is NOT TRUE concerning ant-lions is 'only adult Ant-lions dig pits in the sand with their mandibles, then lie at the bottom waiting for prey to fall in'. It is actually the larval stage of the ant-lion that is known for constructing these pitfall traps. Adult ant-lions do not dig pits; rather, they resemble dragonflies and are capable of flight. Ant-lions do eat ants and other walking insects by pulling their prey down into the sand before they consume them, but they do not have a poisonous bite; they use their mandibles to capture and consume their prey.