What Kind of Bug Is This? Common Bug Groups

Is It a Beetle? How to Tell Beetles From Look-Alikes

Beetles: 5 marks to check, what they are often confused with, whether they bite or sting, and where they turn up, quoted from university entomology and IPM sources.

These pages help you narrow a bug down to its group from what you can see. They are not medical advice. Seek medical care promptly for severe symptoms or any sign of an allergic reaction.

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At a glance

Group: Coleoptera
Body plan: Front wings are hardened and thickened into wing covers (elytra) that shield the fragile membranous flying wings folded underneath; mouthparts are chewing type.
Size: Varies enormously by species; most false powderpost beetle adults are about 1/4 inch, but one native California species reaches 1.5-2 inches.
Bites or stings: Not covered by the sources we opened; handle unknown bugs with care.
Where you find them: Found indoors (pantry, fabrics, wood) and outdoors in gardens/landscapes.

How to tell it is one of the beetles

Chewing mouthparts, unlike true bugs' sucking mouthparts.
Hardened elytra meet in a straight line down the middle of the back, versus true bugs whose folded wings overlap into a triangle/X pattern.
Complete metamorphosis with 4 distinct stages (egg, larva, pupa, adult).
Carpet beetle adults have rounded bodies and short antennae, resembling small lady beetles but much smaller.
Beetle larvae are grublike and legless, or have only three pairs of legs near the head (not caterpillar-like).

Often confused with

People most often mix beetles up with:

True bugs

Open the other page and compare its list against the marks above; the differences are usually in the antennae, wings or the way the body is divided.

Pest or beneficial?

Some beetles are beneficial predators (e.g. ground beetles), while others (wood-boring, pantry, carpet beetles) are structural or stored-product pests.

Where they turn up

Found indoors (pantry, fabrics, wood) and outdoors in gardens/landscapes.

How to photograph it for identification

Get as close as your camera will focus, from directly above, in daylight or a bright lamp. Include the whole body with the legs and antennae in frame; a second shot from the side shows wings and body segments. Put a coin or ruler next to it for scale. For a bite or a bug found on skin or bedding, photograph the bug itself, not the mark. The app names the likely group; use the list above to confirm.

FAQ

Do beetles bite or sting?

The sources we opened for this group do not describe bites or stings. Treat any bug you cannot identify with care and avoid handling it bare-handed.

What is the quickest way to recognize beetles?

Chewing mouthparts, unlike true bugs' sucking mouthparts.

Are beetles a pest?

Some beetles are beneficial predators (e.g. ground beetles), while others (wood-boring, pantry, carpet beetles) are structural or stored-product pests.

How do I tell beetles from true bugs?

Chewing mouthparts, unlike true bugs' sucking mouthparts. Hardened elytra meet in a straight line down the middle of the back, versus true bugs whose folded wings overlap into a triangle/X pattern. The True bugs page lists its own marks.

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