Brown recluse spiders, wolf spiders, and common house spiders are three of the most frequently confused spiders found in homes. They share similar brown coloring and show up in the same places, but they differ in size, eye pattern, behavior, and medical risk. Knowing which one you’re looking at can save you unnecessary worry or, in rare cases, help you respond appropriately to a bite.
Size and Body Shape
Brown recluse spiders are small and slender, with a body length of about a quarter to half an inch and a leg span around the size of a quarter. Their coloring is uniformly light to medium brown, with no banding or stripes on the legs. The body has a smooth, almost waxy appearance rather than a hairy one.
Wolf spiders are noticeably larger, ranging from half an inch to two inches long, with stocky, hairy bodies. Their coloring varies from brown to gray, often with dark stripes or mottled patterns running along the body. If the spider looks muscular and fast, it’s more likely a wolf spider.
Common house spiders (sometimes called American house spiders) are small, roughly the same body size as a brown recluse, but they have a rounder, more bulbous abdomen. They tend to be dark brown with visible patterns or banding on the body and legs, unlike the brown recluse’s uniform coloring.
The Violin Mark and Eye Pattern
The single most reliable marking on a brown recluse is a dark, violin-shaped mark on the top of the head region, with the “neck” of the violin pointing toward the abdomen. Both wolf spiders and house spiders lack this marking. Wolf spiders have dark stripes instead, and house spiders have mottled or banded patterns.
If you can get close enough (or take a photo and zoom in), the eye arrangement is even more definitive. Brown recluses have six eyes arranged in three pairs, with a noticeable space between each pair. This is unusual. Wolf spiders and house spiders both have the standard eight eyes. Wolf spiders are especially easy to distinguish here because two of their front eyes are large and prominent, giving them excellent eyesight for hunting. If you count eight eyes, it is not a brown recluse.
Where You’ll Find Each One
Brown recluses live up to their name. They hide in undisturbed, dry, warm spots: inside stored boxes, behind furniture, in closets, under folded bedding, behind pictures on the wall, near furnaces or water heaters, and in basements. They come out at night to hunt and retreat to flat, irregular webs tucked into corners and crevices during the day. These webs look messy and disorganized, not like the classic circular orb web. They don’t use their webs to catch prey.
Wolf spiders don’t build webs at all. They’re ground hunters that chase down insects, and they often wander into homes through gaps under doors or around foundations. You’ll spot them on the floor, along baseboards, or in garages. They move fast and can look alarming because of their size, but their presence in your home is usually accidental.
House spiders are the classic web builders. They spin messy, tangled webs in corners, window frames, and under furniture. They stay close to their webs and are far less active than wolf spiders. If you see a small brown spider sitting in a cobweb in the corner of your ceiling, it’s almost certainly a house spider.
Geographic Range Matters
Before worrying about brown recluses, consider where you live. Their native range covers a broad swath of the south-central and midwestern United States, roughly from Texas to Georgia and up through the southern halves of Indiana and Ohio. They become less common as you move north and east. Cold winters limit their range outdoors, though small populations occasionally survive in climate-controlled buildings outside their native territory after being accidentally transported.
If you live in the Pacific Northwest, New England, or most of the western United States, the spider you’re looking at is almost certainly not a brown recluse. Wolf spiders and house spiders, by contrast, live across virtually all of North America.
Other Spiders Commonly Mistaken for Brown Recluses
The brown recluse may be the most over-identified spider in the country. Several other species cause frequent confusion:
- Southern house spiders: Males are a similar size and brown color, but they have eight eyes grouped closely together and lack the violin marking.
- Cellar spiders (daddy longlegs): Light brown coloring can cause a double-take, but their extremely long, thin legs and small bodies are distinctive. They’re completely harmless.
- Hobo spiders: Solid brown with minimal markings, but they build funnel-shaped webs near ground level and lack the violin mark.
- Yellow sac spiders: Small and active hunters like brown recluses, but they lean pale yellow rather than brown and have eight eyes.
- Grass spiders: Brown with darker stripes, but they have multiple colors on their legs and abdomen, breaking the brown recluse’s uniform-color rule.
How Bites Compare
Wolf spider bites are essentially harmless. Because of the spider’s size, the bite can puncture the skin and leave visible fang marks, with redness, swelling, and some pain that resolves on its own within a few days. The venom is not dangerous to humans. An allergic reaction is possible but uncommon.
House spider bites are rare and even milder. These spiders have small fangs and little reason to bite, and most people never notice if it happens.
Brown recluse bites carry more risk. The venom can cause a necrotic skin lesion, where a small area of tissue around the bite breaks down over days to weeks. Not every bite causes this reaction, but when it does, the wound can be slow to heal and may require medical care. That said, brown recluse bites are widely over-reported. Studies have found that up to 80% of suspected spider bites turn out to be caused by other insects or arthropods. In 90% of reported spider bite cases, no spider is ever brought to the doctor, and patients rarely remember actually being bitten. Bacterial skin infections, particularly MRSA, produce lesions that look strikingly similar to a brown recluse bite and are a far more common cause of the wound people are worried about.
What to Do if You’re Bitten
For any spider bite, wash the area with soap and water, apply ice or a cold compress to reduce swelling, and take over-the-counter pain relief if needed. An antihistamine can help with significant swelling. Most spider bites, including wolf spider bites, need nothing more than this.
If you develop a spreading area of redness, a dark or blistering wound center, fever, or worsening pain over the next 24 to 72 hours, those are signs the bite may be more serious or could be a skin infection that needs treatment. Try to capture or photograph the spider if possible, since accurate identification changes how the bite is managed.
Quick Identification Checklist
- Uniform brown, no stripes or patterns: Possible brown recluse.
- Violin mark on head region: Brown recluse.
- Six eyes in three separated pairs: Brown recluse.
- Large, hairy, striped, fast-moving on the ground: Wolf spider.
- Two large front eyes, eight total: Wolf spider.
- Small, round-bodied, sitting in a tangled web: House spider.
- Eight eyes, patterns or banding on legs: Not a brown recluse.