Which Beetles Are in Your House?
By the Clark Pest Entomology Team
Last updated: October 28, 2026
Quick answer: Match the beetle to what it was near. Speckled round beetles at a window or fuzzy larvae in a closet are carpet beetles. Small brown beetles in flour, spices or pet food are pantry beetles. Tiny round holes with fine powder under them point to wood-boring beetles. Open the matching guide below to confirm.
Pick the Closest Beetle Match
Clark covers 20 beetles that turn up in homes across California and Northwestern Nevada. They fall into three jobs: eating fabric, eating stored food and boring into wood. Tap the one that sounds closest.
Varied Carpet BeetleAbout 1/10 inch and black with white, brown and dark yellow scales. The fuzzy, striped larva is the one that damages wool, silk and pet hair.
Carpet BeetleBlack with a white, yellow and orange zigzag across the wing covers. Larvae average seven to 11 months in that stage.
Furniture Carpet BeetleA little larger and rounder than the varied carpet beetle, with a white underside. The larva darkens from white to chestnut brown.
Black Carpet BeetleShiny black to dark brown, 1/8 to 3/16 inch long. The larva is shiny and stiff with a tuft of long hairs at its rear.
Warehouse BeetleAbout 1/8 inch and brownish black with yellowish mottling. UC IPM says its larval hairs can irritate the mouth and throat.
Khapra BeetleEasy to confuse with the warehouse beetle. If you think you have one, tell your county agriculture department right away.
Drugstore BeetleAbout 1/8 inch and light brown, with grooves running down the wing covers. It gets into spices, flour, cereal and dry pet food.
Cigarette BeetleLooks like the drugstore beetle but has smooth wing covers. It likes stored tobacco, dry dog food and paprika.
Red Flour BeetleShiny reddish brown, flat and oval, about 1/7 inch long. Its antennae end in an abrupt three-segment club.
Confused Flour BeetleNearly the same size and color as the red flour beetle. Its antennae widen gradually into a four-segment club.
Sawtoothed Grain BeetleSlender, flat and brown at about 1/10 inch, with saw-like teeth on each side of the thorax. Its eyes are smaller than a merchant grain beetle's.
Merchant Grain BeetleNearly a twin of the sawtoothed grain beetle. The clue is its larger eyes.
Rice WeevilA slender, snouted beetle under 3/16 inch. Weevils eat whole grains and seeds and leave small round exit holes.
Granary WeevilAnother snouted beetle under 3/16 inch. It eats whole grains and seeds and is rarely found in flour.
Bean WeevilNo obvious snout. The small, whitish larvae feed inside dried beans and peas.
Lesser Grain BorerShiny dark brown to black, 1/8 inch long, capsule shaped, with a pinched waist.
Cadelle BeetleThe largest of the stored-grain beetles at about 3/8 inch, black to reddish brown, with a pinched waist.
Darkling BeetleIts larva is the mealworm, about 1 1/4 inch long, smooth, hard and cylindrical.
Powderpost BeetleFrom 1/8 to 1/4 inch and dark or reddish brown. The larvae turn hardwood to a fine powder.
Furniture BeetleDark or reddish brown with a hood-like shield behind the head. Its larvae are the woodworms that bore through wood.
Furniture beetle photo by Francisco Welter-Schultes via Wikimedia Commons, released under CC0 1.0.
Carpet Beetle, Pantry Beetle or Wood Borer? Quick Comparison
Carpet beetle versus pantry beetle comes down to three clues: the look, the place and the food. Sizes come from UC IPM and the University of Minnesota Extension.
| Beetle | Size and look | What it goes after | Where people find it |
|---|
| Varied carpet beetle | About 1/10 inch, round, black with white, brown and dark yellow scales | Wool, silk, leather, fur, pet hair and feathers | Adults near windows. Larvae in dark, tucked-away spots such as rugs and closets |
|---|
| Drugstore beetle | About 1/8 inch, cylindrical, light brown with grooved wing covers | Spices, flour, cereal, pasta and dry pet food | Pantry shelves. Adults fly and gather near windows |
|---|
| Cigarette beetle | About 1/8 inch, light brown with smooth wing covers | Stored tobacco, dry dog food and paprika | Pantries and pet food bins |
|---|
| Red or confused flour beetle | About 1/7 inch, shiny reddish brown, flat and oval | Flour, bran, cereal, dried fruit, nuts and chocolate | Opened or forgotten packages |
|---|
| Sawtoothed or merchant grain beetle | About 1/10 inch, slender and flat, with six saw-like teeth on each side of the thorax | Stored food | Opened or forgotten packages |
|---|
| Rice or granary weevil | Under 3/16 inch, slender, with a snout | Whole grains and seeds, rarely flour | Grain and seed containers, with small round exit holes |
|---|
| Powderpost beetle | Adults 1/8 to 1/4 inch, dark or reddish brown | Hardwoods and bamboo | Tiny round exit holes with talc-like powder below |
|---|
| Deathwatch beetle | Exit holes vary in size | Softwoods such as Douglas-fir, in old or partly decayed wood | Damp subareas, basements and outbuildings. Dust is slightly gritty |
|---|
Tiny Striped or Speckled Bugs on the Windowsill or in Bed
Adults at the window are only part of the story
UC IPM says adult carpet beetles feed on pollen and nectar, not fabric. They fly in from garden flowers or ride in on cut flowers, and they head for light, so you find them at windows. A few adults indoors are no cause for alarm. Act when larvae are developing in fabric.
What the larvae eat
UC IPM lists wool, silk, leather, fur, natural-bristle brushes, pet hair and feathers. Synthetic fibers and wood are not on the list. They prefer dark, secluded places. UC IPM lists wool rugs, animal skins and stuffed animals among the spots where adults lay eggs.
Itchy welts that look like bites
A report in the CDC journal Emerging Infectious Diseases found that carpet beetle lesions mimic bites but are allergic reactions to larval hairs lodged in the skin. Penn State Extension says people seem to become sensitized only after years of exposure to the hairs. An unexplained itchy rash is a question for a doctor. Finding the larvae is the question for you.
What clears them out
UC IPM calls laundering or dry cleaning the most important method for washable items. For other items, it says to seal them in a plastic bag and freeze them for 2 weeks below 18 degrees Fahrenheit. Heating at 120 degrees or higher for at least 30 minutes also works if the item can take it. Vacuum frequently and throw out the bag right away. UC IPM says not to spray clothing or bedding.
Small Brown Beetles in the Pantry
Find the package, not just the beetles
UC IPM says the source is often a package damaged at the store, or one that was opened and forgotten. The University of Minnesota Extension suggests checking the top of each product with a flashlight or pouring it onto a cookie sheet. It warns there could be more than one infested source. Infested food goes out of the house.
Freeze, heat or seal what is left
The University of Minnesota says older food can go in the freezer at 0 degrees for at least four days. It can also go in an oven at 130 degrees for at least 30 minutes. Store the survivors in sealable glass, metal or heavy plastic containers. UC IPM says plastic bags are not adequate. Vacuum shelf cracks and corners, then empty the vacuum.
Why spray is the wrong tool
UC IPM says insecticides are not recommended for any pantry pest and that spraying on or near food may harm people more than the pests. Minnesota adds that household insecticides have no effect on insects inside food packages. It also says these pests do not bite or sting people or pets.
The one pantry beetle you report
The khapra beetle is a serious stored-grain pest. Clark's khapra guide says your county agriculture department needs to know about it immediately. Its larvae look like other Trogoderma beetles and some carpet beetles, so a microscope settles the ID.
Tiny Holes and Fine Powder in Wood
Powderpost or deathwatch?
UC IPM says powderpost beetles attack hardwoods and bamboo and leave dust that feels like talcum powder. Deathwatch beetles favor softwoods such as Douglas-fir, in old or partly decayed wood, and leave slightly gritty dust. UC IPM says they prefer wood above 14 percent moisture, so damp subareas, basements and outbuildings are likelier spots than conditioned homes.
Signs to look for
UC IPM names exit holes, powdery piles on floors and new beetles on windowsills. Powderpost adults fly toward light, so dead ones often turn up on sills.
What helps
UC IPM says prevention is the best approach and that control gets hard once an infestation starts. Inspect lumber and furniture before they come indoors and bring in only the firewood you will burn that day. Borate treatments must be applied by a licensed pest control operator. Clark's wood-boring beetle guides send readers to its wood-destroying organism specialists.
Clark's Expert Insight
A beetle at the window tells you where it ended up, not where it grew up. Before you spray anything, follow the clue. Dark closets and wool point to carpet beetles. A forgotten package points to a pantry beetle. Small round holes point to a wood borer. The source decides the fix.
Beetle Questions Homeowners Ask
What is the difference between a carpet beetle and a drugstore beetle?
UC IPM describes the varied carpet beetle as about 1/10 inch, round and black with white, brown and dark yellow scales. It describes the drugstore beetle as about 1/8 inch, cylindrical and uniformly light brown with grooved wing covers.
Do carpet beetles bite?
A CDC journal report says carpet beetle rashes mimic bites but are allergic reactions to larval hairs, not bites. See a doctor about any rash you cannot explain.
Do drugstore beetles bite or fly?
The University of Minnesota Extension says pantry pests do not bite or sting people or pets. It says drugstore and cigarette beetles can fly and are found near windows.
Do carpet beetles eat wood?
No. UC IPM lists animal products such as wool, silk, leather, fur and feathers as their food. It says they occasionally eat certain spices and grains. Wood damage comes from a different group, the wood-boring beetles.
Is food with pantry beetles safe to eat?
Play it safe and throw it out. UC IPM says to discard food showing any sign of infestation. It adds that warehouse beetle hairs can irritate the mouth, throat and digestive tract.
When should I call a professional?
Call when you cannot find the source after cleaning the pantry, when larvae keep turning up in carpet or closets or when you see fresh exit holes and powder in wood. If you suspect a khapra beetle, contact agriculture officials first.