True bug (Heteroptera) is the correct common name for a group of insects that includes several pest species but also many predatory bugs that attack soft-bodied insect pests. Examples are as aphids, beetle larvae, small caterpillars,  thrips,

Assassin bugs, ambush bugs, damsel bugs, minute pirate bugs, and spined soldier bugs are beneficial true bugs.
As opposed to beetles  (Coleoptera) which have a straight line connection between wing covers, bugs have overlapping wings which give a diamond-shaped appearance to the back of the insect.

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