The brown recluse is one of only two spiders in the United States that poses a real medical threat to humans. Knowing how to identify one — and distinguish it from the many harmless look-alikes — is essential for anyone living in the central or southern US.

Brown Recluse Markings: The Violin and the Eyes

Two physical features reliably identify a brown recluse. If your spider has both, you're looking at the real thing:

1. The Violin-Shaped Marking

A dark brown violin-shaped pattern sits on the top of the cephalothorax (the front body section), with the neck of the violin pointing toward the abdomen. This marking is present on every adult brown recluse but can be faint on juveniles.

2. Six Eyes in Three Pairs

Most spiders have eight eyes. The brown recluse has only six, arranged in three pairs — two at the front and one on each side of the head. This is the most reliable identification feature because plenty of harmless spiders also have faint violin-like markings, but very few have six eyes.

Other Brown Recluse Features

• Body size: 6–20 mm (about the size of a dime including legs)
• Color: Uniformly light to medium brown, sometimes with a slightly darker violin mark
• Legs: Long and thin, uniform color, no stripes or bands
• Abdomen: Solid brown, no visible markings or patterns
• Habitat: Dry, undisturbed indoor spaces and outdoor debris

Spiders Commonly Mistaken for Brown Recluses

Most "brown recluse" sightings turn out to be harmless look-alikes. The following spiders are frequently misidentified:

• Wolf spider — larger, hairier, with striped legs
• Grass spider — similar size but has long spinnerets and a distinctive two-stripe pattern on the cephalothorax
• Cellar spider — much longer legs, smaller body, builds messy webs in corners
• Hobo spider — similar brown color but has a chevron pattern on the abdomen

When in doubt, take a photo and upload it to our free spider identifier — the AI will tell you within seconds whether you're actually looking at a brown recluse or something harmless.

Where Do Brown Recluses Live?

Brown recluses are native to the central and southern United States — from Nebraska and Iowa south to Texas, and east to Georgia and Tennessee. They are rare or absent outside this range despite occasional confirmed sightings elsewhere.

Inside a home, they prefer:

• Cardboard boxes in basements, attics, and storage rooms
• Undisturbed clothing, shoes, and linens
• Behind baseboards, inside wall voids, and under furniture
• Cluttered corners of garages, sheds, and crawl spaces

Signs of a Brown Recluse Infestation

Because recluses are shy and nocturnal, you may have an infestation without ever seeing an adult. Watch for these signs:

• Shed skins — Papery, translucent casts that look like miniature versions of the spider
• Egg sacs — Off-white, loosely woven silk balls about 1 cm across, tucked into corners and crevices
• Small, irregular webs — Unlike orb weavers, recluse webs are loose and disorganized, used as a retreat rather than to catch prey
• Dead insects — Recluses prey on other insects, so an unusual number of insect carcasses can indicate active hunting
• Bites — Recluse bites often go unnoticed for hours, then develop into a painful, expanding red lesion with a darker center

What to Do If You Suspect Brown Recluses

1. Confirm identification. Catch one in a jar (with a tool, not your hands) or photograph it and verify using our AI identifier.
2. Reduce clutter. Recluses love undisturbed hiding spots. Clean and organize basements, closets, and attics.
3. Use sticky traps. Place glue boards along baseboards to catch wandering spiders and monitor population levels.
4. Seal entry points. Caulk gaps around utility lines, windows, and foundations.
5. Call a professional. Confirmed brown recluse infestations usually need professional pest control for full elimination — DIY methods rarely catch all hiding spiders.

If You've Been Bitten

Brown recluse bites are often painless at first. Over the next 12–24 hours they may develop into a red, swollen, painful wound with a dark center. Seek medical attention if you suspect a recluse bite, especially if the area is spreading or you develop fever and chills. Bring the spider if you can safely capture it — positive identification helps doctors choose the right treatment.