Spider beetles are not bed bugs, and they are not in your bed to bite you. These tiny, round beetles sometimes wander into bedrooms while searching for food, and their reddish-brown color and small size make them easy to mistake for bed bugs or even ticks. Understanding what you’re actually dealing with can save you a lot of stress and help you solve the problem quickly.
What Spider Beetles Look Like
Spider beetles get their name from their long, spindly legs, which give them a spider-like appearance at first glance. They are small, typically 1.5 to 3.5 millimeters long (roughly the size of a sesame seed), with a distinctly round, globular abdomen. Some species, like the golden spider beetle, can reach up to 5 millimeters. Their bodies are covered in fine hairs, and depending on the species, they range from reddish-brown to golden-yellow. Adults have long, thin antennae with 11 segments.
The shape of the body is the fastest way to tell a spider beetle apart from a bed bug. A spider beetle’s abdomen is round like a tiny ball. A bed bug, even after feeding, takes on a flattened oval or elongated football shape. Bed bugs also have six legs that are much shorter and stubbier. If what you found looks round and shiny with long legs, it’s almost certainly a spider beetle, not a bed bug.
Spider beetles can also be confused with ticks. The key difference: ticks are arachnids with eight legs (adults, at least), while spider beetles are insects with six legs and visible antennae. Ticks lack antennae entirely.
Why They Show Up in Your Bedroom
Spider beetles are scavengers. They feed on dried food products like grains, cereals, flour, spices, dried fruit, and even pet food. They also eat animal hair, feathers, old rodent droppings, and dead insects. They prefer dark, undisturbed spaces, which is why they turn up in pantries, wall voids, attics, and basements.
Finding one in your bed doesn’t mean it’s living there or feeding on you. Spider beetles don’t bite humans or feed on blood. They likely wandered in from a nearby food source, attracted by crumbs, a forgotten snack, or organic debris that has accumulated in a corner of the room. In older homes, they sometimes feed on materials inside walls, like old bird or rodent nests, and then make their way into living spaces through cracks and gaps.
Their larvae are small (about 3 millimeters), C-shaped, cream-colored grubs with brown heads. If you’re finding adult beetles repeatedly, the breeding population is somewhere nearby, probably within a food source you haven’t checked yet.
Spider Beetles Do Not Bite
This is the most important thing to know if you’re worried about finding one in bed. Spider beetles have no interest in you. They lack the mouthparts to pierce skin and do not feed on blood. If you’re waking up with bites and also seeing small bugs, the bites are coming from something else. Bed bugs, fleas, and mosquitoes are the most common culprits for nighttime bites. A spider beetle in the same room is a coincidence, not the cause.
How to Get Rid of Them
The fix for spider beetles is straightforward: find and remove their food source. They aren’t nesting in your mattress or bedding. The real infestation is wherever they’re eating and breeding, which is usually a pantry, cabinet, or storage area.
Start by inspecting all dried food in your kitchen and any food stored near the bedroom. Look for signs of contamination: tiny beetles, larvae, webbing, or fine dust in bags of flour, cereal, rice, oats, spices, or dried beans. Check pet food bags, birdseed, and any bulk food items that have been sitting for a while. Contaminated food should be thrown out immediately, sealed in a bag before going in the trash.
Sticky traps placed near suspected food sources can help you track where the beetles are most active, especially since they tend to move around at night and hide during the day. Vacuum thoroughly along baseboards, in closets, under furniture, and in any cracks or crevices where food debris could accumulate. Pay special attention to areas behind appliances and in the backs of cabinets.
If your home has had issues with mice, birds nesting in eaves, or squirrels in the attic, those old nests can serve as a food source for spider beetles. Removing nests from inside and around the building eliminates a breeding site that’s easy to overlook.
Keeping Them From Coming Back
Long-term prevention comes down to food storage and cleanliness. Transfer pantry staples like flour, grains, pasta, and cereal into airtight containers made of glass or hard plastic. This cuts off the food supply even if a beetle finds its way into your kitchen. Vacuum regularly, especially in storage areas and along baseboards where crumbs and organic debris collect.
Seal cracks around windows, doors, and where pipes enter walls. In older buildings, spider beetles can travel through wall voids for extended periods without being noticed, so reducing entry points into living spaces helps keep them out of bedrooms.
Infestations rarely reach large numbers, but they can persist for a long time if the food source isn’t identified. If you’ve cleaned out your pantry, vacuumed thoroughly, and are still seeing beetles after a few weeks, the source may be hidden inside a wall or in an area you can’t easily access. At that point, a pest control professional can help locate and treat the problem.