Home / Ptinidae Beetles / Drugstore Beetle (Stegobium paniceum)

Drugstore Beetle (Stegobium paniceum)

The drugstore beetle, named for its tendency to infest prescription drugs, is a member of the family of Ptinidae beetles, first described by Swedish zoologist Carl Linnaeus in 1758.

Drugstore Beetle

Scientific Classification

  • Family: Ptinidae
  • Genus: Stegobium
  • Scientific name: Stegobium paniceum

Physical Description and Identification

Adult

Size:2.25 to 3.5 mm (1/10 to 1/7 inch)

Color:These beetles are uniformly reddish-brown or brown.

Other Characteristic Features:It is cylindrical, with a series of fine setae on the elytra.

Stegobium paniceum

Larva

The grubs are white, with the later instars being more scarab-like.

Drugstore Beetle Larvae

Pupa

Once mature, the larvae begin to pupate.

Drugstore Beetle Pupa

Egg

A female beetle can lay up to 75 eggs at once.

Quick facts

Other namesBread beetle, biscuit beetle
Lifespan2-4 weeks
DistributionCosmopolitan
HabitatWarm climates
Seasons activeYear-round
Diet of adultsDoes not feed
Pictures of Drugstore Beetles
Biscuit Beetle

Identifying the damage caused by them

The larvae are known to target prescription drugs, also feeding on various foodstuffs like biscuits and bread and other sweets and spices.

Did you know

  • It was once called the biscuit weevil, even though it is not a true weevil.
Drugstore Beetle Image
Bread Beetle

Image Source: grainscanada.gc.ca, whatseatingyourcollection.com, bugguide.net, live.staticflickr.com, cdn.branchcms.com, schendelpest.com, merkur.de

The drugstore beetle, named for its tendency to infest prescription drugs, is a member of the family of Ptinidae beetles, first described by Swedish zoologist Carl Linnaeus in 1758.

Drugstore Beetle

Physical Description and Identification

Adult

Size:2.25 to 3.5 mm (1/10 to 1/7 inch)

Color:These beetles are uniformly reddish-brown or brown.

Other Characteristic Features:It is cylindrical, with a series of fine setae on the elytra.

Stegobium paniceum

Larva

The grubs are white, with the later instars being more scarab-like.

Drugstore Beetle Larvae

Pupa

Once mature, the larvae begin to pupate.

Drugstore Beetle Pupa

Egg

A female beetle can lay up to 75 eggs at once.

Quick facts

Other namesBread beetle, biscuit beetle
Lifespan2-4 weeks
DistributionCosmopolitan
HabitatWarm climates
Seasons activeYear-round
Diet of adultsDoes not feed
Pictures of Drugstore Beetles
Biscuit Beetle

Identifying the damage caused by them

The larvae are known to target prescription drugs, also feeding on various foodstuffs like biscuits and bread and other sweets and spices.

Did you know

  • It was once called the biscuit weevil, even though it is not a true weevil.
Drugstore Beetle Image
Bread Beetle

Image Source: grainscanada.gc.ca, whatseatingyourcollection.com, bugguide.net, live.staticflickr.com, cdn.branchcms.com, schendelpest.com, merkur.de

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