Identifying Brown Recluse Spiders: Unique Characteristics

These shy little spiders are most known by their dark-brown violin markings, which is why they're also called "fiddle-back" or "violin" spiders. Although many people are afraid of them and they have a bad reputation, brown recluse bites are actually very rare. While they are venomous, they usually only pose a serious risk to children or elderly people with pre-existing health conditions.^{[1]
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Go to source} Read on to learn everything you need to know about brown recluses, including what you should do if you think you've been bitten by one.

Things You Should Know

Brown recluses are small spiders with light-brown bodies and legs, 6 eyes, and fine hair on their legs.
True to their name, brown recluses favor sheltered, out-of-the-way places and typically aren't out in plain sight.
Brown recluse spiders are native to the southeastern and midwest United States. If you live elsewhere, the spider is likely not a brown recluse.

Identification Chart

Brown Recluse Identification Chart

Method 1

Method 1 of 3:

Features of a Brown Recluse

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1
Light-brown body and legs
The brown recluse is a solid light-brown color, typically similar to dirt or sand. Apart from the violin marking behind their heads, these spiders don't have any variation in color on either their bodies or their legs, including their undersides.^{[2]
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- If the spider has stripes or other markings on its body or legs, it's not a brown recluse.
- Spiders with darker abdomens or several different colors on their bodies also aren't brown recluses. For example, huntsman spiders and funnel weavers are often mistaken for brown recluses, but they have different colors on their bodies and legs.^{[3]
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2
Violin marking
This dark brown marking appears on the brown recluse's cephalothorax—typically people will just refer to this as the spider's back, although that's not completely accurate. The neck of the violin points toward the spider's body. The shape isn't always super well-defined, though, so it can be hard to spot.^{[4]
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- Other types of spiders have similar markings, so this alone isn't enough to guarantee you're looking at a brown recluse.
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3
Six eyes
The brown recluse's unique eye configuration is usually an easier way to identify them than other markings. While most spiders have 8 eyes, a brown recluse has only 6, arranged in 3 pairs—one directly in the center of their head with the other 2 pairs on either side.^{[5]
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- The eyes are so small it can be difficult to actually see them without a magnifying glass. If you're going to hold a magnifying glass up to a live spider, be careful!
- A woodlouse spider also has 6 eyes, but they're in a different configuration. Woodlouse spiders tend to be reddish with a dark-reddish brown front half, pale back half, and gray abdomen.^{[6]
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Most spiders have spines on their legs, but brown recluses have only fine hairs. If you see spines, you're definitely looking at a different species of spider.^{[7]
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5
Small size
A brown recluse's body doesn't grow much bigger than ¹⁄₂ inch (1.3 cm) with its legs extended. If you've got a big, scary-looking spider, it's probably not a brown recluse. These small spiders can sit comfortably on the head of a US quarter, including their legs.^{[8]
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- If the spider is much larger, you're likely looking at a wolf spider.

Method 2

Method 2 of 3:

Brown Recluse Habitat

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1
Southeastern and midwest United States
Brown recluse spiders live primarily in 16 US states: Alabama, Arkansas, Georgia, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Mississippi, Missouri, Nebraska, Ohio, Oklahoma, Tennessee, and Texas. If you don't live in these areas, chances are you'll never encounter a brown recluse spider.^{[9]
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- Brown recluse spiders have been found in large cities outside these areas, likely because they were hiding in something that was moved there.^{[10]
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2
Dry, hidden spaces
These spiders are called "recluses" because they tend to favor out-of-the-way places where they won't be disturbed. Generally, they're just not really interested in people and try to stay out of your way. Look for them in:^{[11]
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- Attics
- Dry basements
- Closets
- Sheds or barns
- Woodpiles^{[12]
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- Shoes
- Boxes of stored items
Brown recluse spiders don't use their webs to catch prey—they go out hunting at night. Their webs are flat retreats in the bottom of boxes or corners, constructed to protect the spider and their young. The loose strands of the web are sticky to the touch and usually off-white or grayish in color.^{[13]
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Method 3

Method 3 of 3:

Treating a Brown Recluse Bite

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1
Wash the bite area immediately upon discovery. A brown recluse bite isn't going to hurt. In fact, it can take up to 8 hours before you even realize you were bitten at all. When you notice a bite, clean it carefully with soap and warm water.^{[14]
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- The area around the bite might become red or swollen within 3-8 hours after the bite. You might also feel a burning sensation.
- Apply an ice pack or cold compress to the site for 10 minutes to reduce swelling.
2
Seek medical treatment as soon as possible. When in doubt, call your doctor about any painful or swollen bite. Even if it's not a brown recluse bite, prompt medical treatment will keep it from developing into something more serious. Prompt medical treatment is especially important for small children and elderly adults or people with pre-existing medical conditions.^{[15]
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- Keep in mind that doctors aren't typically entomologists. They'll treat your bite but might not be able to tell if it was actually a brown recluse bite or something else. ^{[16]
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- If severe, an ulcer will develop within 3-5 days after the initial bite. If the ulcer breaks down, it becomes a wound that can take months to completely heal.^{[17]
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3
Monitor other symptoms, including fever and nausea. If you develop a fever or if the area around the bite appears infected, get emergency medical treatment as soon as possible. Even though this is likely a secondary infection, it's still a medical emergency. You need antibiotics to kill the infection and keep it from spreading.^{[18]
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- If not infected, most brown recluse bites heal completely within 3 weeks.

Expert Q&A

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Question

Are brown recluses dangerous?

Samuel Ramsey, PhD
Entomologist
Dr. Samuel Ramsey is an Entomologist and a researcher with the United States Department of Agriculture. Dr. Ramsey has extensive knowledge of symbiosis and specializes in insect disease spread, parasite behavior, mutualism development, biological control, invasive species ecology, pollinator health, and insect pest control. He holds a Bachelor’s degree in Entomology from Cornell University and a Ph.D. in Entomology from the University of Maryland. Dr. Ramsey’s research on bees has enabled researchers to develop targeted control techniques to restore honey bee populations worldwide. He also hosts a YouTube series called “Dr. Buggs.”

Samuel Ramsey, PhD

Entomologist

Expert Answer

The bite of a Brown Recluse has a type of necrotoxin that actually breaks down healthy human skin and flesh in a way that is frightening and conspicuous and concerning. However, it is important to know that most Brown Recluse bites do not result in that necrotized wound growing that won't heal. That only happens for some people and it is an infrequent occurrence. It is even less likely that one will be bitten by these spiders because they are so reclusive. They tend not to spend much time interacting with human beings.

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Question

Should I be worried about being bitten if there's a brown recluse in my home?

Samuel Ramsey, PhD
Entomologist
Dr. Samuel Ramsey is an Entomologist and a researcher with the United States Department of Agriculture. Dr. Ramsey has extensive knowledge of symbiosis and specializes in insect disease spread, parasite behavior, mutualism development, biological control, invasive species ecology, pollinator health, and insect pest control. He holds a Bachelor’s degree in Entomology from Cornell University and a Ph.D. in Entomology from the University of Maryland. Dr. Ramsey’s research on bees has enabled researchers to develop targeted control techniques to restore honey bee populations worldwide. He also hosts a YouTube series called “Dr. Buggs.”

Samuel Ramsey, PhD

Entomologist

Expert Answer

People are most frequently bitten if a Brown Recluse, for whatever reason, ends up inside of a shoe and someone sticks their foot inside, crushes it, and in its last-ditch effort to get away from what it thinks is a predator, it bites them. However, they very infrequently actually bite human beings.

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Tips

Shake out seasonal clothing and shoes before you put them on, especially if they were kept in a dark, dry area.^{[19]
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Wear work gloves and long sleeves when sorting through clothing or stored items—the small brown recluse can't bite through clothing.^{[20]
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Plug up or seal any vents or gaps to keep brown recluse spiders from entering your home.

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Tips from our Readers

The advice in this section is based on the lived experiences of wikiHow readers like you. If you have a helpful tip you’d like to share on wikiHow, please submit it in the field below.

If you live in the Midwest, buy some sticky traps and put them out for a while. You'll know within a few weeks if you have brown recluses sharing a home with you. I have lived in an old (100 year old) house near St. Louis, MO for 6 years now and I used to only catch L. Reclusa in the traps. I've since thinned their population and now I see occasionally beetles and silverfish, too.
Hairspray is good for 'freezing' the brown recluse. I most often see them in the restroom, Anyway, I grabbed my hairspray last time I saw one & made spider 'taxidermy.' It helped to scare the other spiders away & made for a great science project.
A great way to trap recluses from unused rooms is to make a tube out of duct tape and paste it under doorways. Catches them and others like a charm. No substitute for exterminating and other good precautions.

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Warnings

If you think you've been bitten by a brown recluse, seek medical treatment as soon as possible.^{[21]
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Brown recluse spider bites are particularly dangerous for children, elderly people, and people with pre-existing medical conditions.^{[22]
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