How are beetles different from true bugs?

Beetles and true bugs are both members of the class Insecta, but they belong to different orders and possess distinct biological characteristics.1

Key Differences

• Development: Beetles are holometabolous, meaning they undergo complete metamorphosis involving four distinct stages: egg, larva, pupa, and adult. In contrast, true bugs are hemimetabolous, meaning they undergo incomplete metamorphosis, hatching from eggs as nymphs that resemble smaller, immature versions of the adult.1
• Mouthparts: Beetles have mouthparts adapted for chewing and gnawing. True bugs (order Hemiptera) possess specialized piercing-sucking mouthparts, often referred to as stylets, used to feed on plant or animal juices.123
• Wing Structure: Beetles have two pairs of wings, with the front pair modified into hard, protective covers called elytra that meet in a straight line down the back. True bugs typically have forewings that are thickened or leathery at the base and membranous at the tips, which overlap when at rest.145

While the term "bug" is often used colloquially for any small insect, "true bug" refers specifically to members of the suborder Heteroptera.16