Varied Carpet Beetle (Anthrenus verbasci) — identification, habitat & look-alikes

The varied carpet beetle is a common household pest across the United States: its fuzzy larvae chew wool rugs, furs, feathers, silk, and museum specimens. The tiny round adults, about 1/10 in (2–3 mm) long, don't eat fabric at all. They feed on pollen and nectar and often turn up on windowsills.

Appearance

Appearance: Adults are almost spherical, black with an irregular pattern of white, brown, and dark yellow scales and three wavy white bands across the . Older adults may lose their scales and look plain brown or black.

Look-alikes

furniture carpet beetleAnthrenus flavipes

Furniture carpet beetle adults are slightly larger and rounder, with black spots among white and yellow-to-orange scales and white undersides. Their larvae are widest at the front, while varied carpet beetle larvae are widest at the rear.

Why they get mixed upBoth are small, scaly carpet beetles found indoors.

black carpet beetleAttagenus unicolor

Black carpet beetle adults are a bit longer and plain shiny black to dark brown. Their larvae are shiny, smooth, and hard-looking, unlike the fuzzy, striped varied carpet beetle larvae.

Why they get mixed upTheir larvae damage the same fabrics in the same hidden spots.

Where it lives

Typical habitats: Homes
Flower gardens
Bird and wasp nests
Range: Found across much of the world, including North America.
Preferred conditions: Larvae feed in dark, undisturbed places such as closets, folds of stored clothing, and under furniture. Outdoors they develop in bird, bee, and wasp nests and in old spider webs full of dead insects.

Behavior

Diet: Larvae eat animal-based materials: wool, fur, feathers, hair, silk, leather bindings, and dead insects, plus some dried plant products. They do not eat synthetic fibers. Adults eat pollen and nectar.
Activity: Adults are drawn to light and gather at windows and drapes. They fly in from the yard or ride in on cut flowers. This was the first insect shown to have a built-in yearly body clock.

Life cycle

Larva: Larvae, nicknamed "woolly bears," grow to about 3/16 in (4–5 mm). They are striped light and dark brown, wider at the rear, and raise tufts of hair into a plume when disturbed.
Lifespan: The full life cycle takes 1–3 years depending on conditions, running faster in warmth. Adults live only about 2–6 weeks.

Cautions

Cautions: They don't bite or sting, but shed larval hairs can cause itchy welts that people sometimes mistake for bed bug bites.

Conservation

IUCN Red List: NENot EvaluatedNot yet assessed

Culture and stories

Culture and stories: Damage can hint at who did it: carpet beetle larvae tend to destroy one large patch, while clothes moths more often leave scattered holes, though this is not always reliable. Bristly brown cast skins and no webbing point to carpet beetles.
Museums have to fight carpet beetles, this species included, because the larvae eat pinned insects and stuffed animals. Carpet beetle larvae can also damage piano felts and hammers badly enough to affect the sound.