Ok, apparently I was slightly wrong. Bugs are different from beetles in more ways than just the sucking...
What are the differences between bugs and beetles?
Bugs and beetles may sometimes look similar at first glance, but they belong to two quite different insect groups. Here are some features that can help distinguish between them.
Bugs: mouthparts modified into piercing stylet (i.e. needle-like).
Beetles: chewing mouthparts.
Bugs: wings (if present) are membranous or partially thickened.
Beetles: forewings modified to form hard, leathery coverings called elytra, hindwings membranous and fold under elytra when not flying.
Bugs: liquid diet: mostly plant-feeders (nectar/sap), some feeders on animal fluids.
Beetles: wide range of plant and animal materials eaten.
Bugs: incomplete metamorphosis - juveniles resemble adults except smaller and lack wings.
Beetles: complete metamorphosis - larvae with hardened head, chewing mouthparts and usually have legs.
Bugs: Order Hemiptera
Beetles: Order Coleoptera
Dr Dave Britton , Collection Manager, Entomology
Last Updated: 9 July 2009
Tags insects, coleoptera, hemiptera, comparisons, comparing, identification, identifying, arthropods, arthropoda, http://australianmuseum.net.au/What-are-the-d...