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Sticker of Ten-lined June beetle
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Ten-lined June beetle

Polyphylla decemlineata
Eats: PlantsBeetlesForests and woods6 legs

The ten-lined June beetle is a big brown beetle with white stripes running down its back. If you pick it up, it makes a hissing noise like a tiny bat. The males have fancy feelers that open up like a fan.

Lives in
Western United States and Canada
Length
3 cm (1.2 in)
some grow even bigger
Top speed
about 0.71 km/h (0.44 mph)
On foot, estimate
Can it hurt you?
Harmless
Harmless. It may hiss when you touch it, but it is just trying to scare you off.
What does it eat?
The grown-up beetles nibble leaves, especially old pine needles. The grubs live underground and eat plant roots.
For real!Photo of Ten-lined June beetle
Picture by Junkyardsparkle. CC0, via Wikimedia Commons.

How big is it?

How long is it?

Ten-lined June beetle about 3 cm long (1.2 in)A grain of rice about 6 mm (0.24 in)A toy building brick about 3.2 cm (1.3 in)A crayon about 9 cm (3.5 in)
as long as 5 grains of rice in a rowcould run across a dinner table in 5.1 seconds

How big is Ten-lined June beetle compared to YOU?

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How fast is it?

cool stuff

Fun facts

1

It hisses by pushing its wings down, which squeezes air out between its wings and back.

2

Each wing cover has four long white stripes and one short one. That makes ten lines in all.

3

The male uses his big fan-like feelers to smell the females. He folds them shut when he is scared.

4

Its grub can grow up to about 5 centimetres long and may stay a grub for as long as four years.

5

The grown-up beetles fly towards lights at night.

you asked

Most asked questions about Ten-lined June beetle

?Why does the ten-lined June beetle hiss?

It hisses to scare away anything that disturbs it. The sound comes from air pushed out by its wings.

?Is the ten-lined June beetle dangerous?

No. It does not sting and is harmless to people.

?How big is a ten-lined June beetle?

About 3 centimetres long, and some grow even bigger.

For bug experts

Scientific name
Polyphylla decemlineata
Group
Beetles
Family
Scarabaeidae
Classification
Insecta > Coleoptera > Scarabaeidae
Lives on
North America
Also known as
Watermelon beetle

Where the facts come from

  1. Ten-lined June beetle (Wikipedia, CC BY-SA 4.0): what it looks like, where it lives, what it eats, sizes and fun facts, retold in simple words.
  2. Picture by Junkyardsparkle. CC0, Wikimedia Commons. The round sticker of this bug is cut from the same picture.

If we got something wrong, sorry, we are bug fans, not a science journal. Tell us at [email protected] and we will fix it.

More from the same group: Beetles

Also at home here: Forests and woods