Black Spider With White Spots

Short answer

• A black spider with white spots does not have one answer. The description fits several different spiders, and the same spider can look different as a juvenile, as an adult, in bright light, or after its hairs have worn.
• In the United States, the most common match for a black, hairy, daytime spider with white spots on its back is the bold jumping spider, Phidippus audax. Penn State Extension describes it as a black, hairy spider with a pattern of white, yellow, or orange spots on the top of the abdomen, and notes that younger spiders often have orange spots.
• Other strong candidates include the much smaller zebra jumping spider, with white stripes rather than round spots, and cobweb spiders in the genus Steatoda, often called false widows, which may show a pale band or pale marks on the top of a dark, glossy abdomen.
• A true black widow is a different case. An adult female is usually shiny black with a red or red orange hourglass mark on the underside of the abdomen, not white spots on the top. White spots on top therefore point away from an adult female black widow, but they do not rule out every widow, because immature widows and males can be patterned on top.
• To narrow the identification, note the size, whether the marks are spots, stripes, or a band, the body shape, the size of the front eyes, whether the spider jumps in daylight or sits in a tangled web, and where and when you saw it. A photograph taken from a safe distance, without handling the spider, preserves far more detail than memory alone.
• This article is general identification information only. It does not diagnose a bite, identify a spider from a description alone, or give medical advice.

Why One Description Fits Many Spiders

“Black spider with white spots” describes what a person noticed, not a species name. It leaves out how many spots there were, whether they were round or stretched into stripes, whether they sat on the top or the underside of the abdomen, how large the spider was, and what it was doing. Two people can use the same words for different spiders, and one spider can earn different descriptions at different ages.

Color alone is therefore a weak starting point. Body shape, eye arrangement, web type, habitat, time of day, and behavior narrow the list faster.

Spiders have two main body parts: the front part, called the cephalothorax, carrying the eyes and legs, and the rear part, called the abdomen, carrying most spots people notice. In jumping spiders, the front eyes are strikingly large, and that feature often settles the family even when the spot pattern is unclear. This article works as a process of elimination.

How To Read A Spider Before Naming It

First, how large was the body, not counting the legs? A spider about 4 to 6 millimeters long is in a different size class from one about 8 to 19 millimeters long. Compare it with something nearby in the same view, such as a fence board or a leaf, rather than guessing in isolation.

Second, what shape were the pale marks? Round spots, bars, stripes, a crescent, a band across the front of the abdomen, and paired rows are different patterns. A bold jumping spider typically shows spots. A zebra jumping spider typically shows stripes. A false widow may show a pale band across the front of the abdomen with fainter marks behind it.

Third, were the marks on the top or the underside? A true widow is identified mainly by the underside of the abdomen. A bold jumping spider is identified mainly by the top. If you only saw the top, you have not yet checked the feature that matters most for a widow.

Fourth, what was the body shape? Jumping spiders are compact and sturdy, with short, strong legs. Cobweb spiders such as widows and false widows have a rounded, often glossy abdomen on longer, thinner legs, and they sit in a web rather than roaming. Orb weavers have a larger, often triangular or oval abdomen and sit in a round, wheel shaped web.

Fifth, what were the eyes like, and what was the spider doing? Jumping spiders have two very large front eyes that face forward. A spider hunting in daylight on a wall, fence, or plant is behaving like a jumping spider. A spider sitting in a tangled web in a dark corner is behaving like a cobweb spider. A spider in the center of a round web at night is behaving like an orb weaver.

Finally, what color were the mouthparts? In bold jumping spiders, the mouthparts, called chelicerae, frequently have an iridescent green hue, according to Penn State Extension. That green flash is a useful supporting clue, not proof on its own. None of these observations requires handling the spider, and handling usually makes identification harder, because a disturbed spider shows fewer marks.

Quick Comparison Of The Main Candidates

Candidate	Size, body length	Pale marks	Key clues
Bold jumping spider, Phidippus audax	Females 8 to 19 millimeters, males 6 to 13 millimeters	Spots on top of abdomen, orange in young spiders	Compact, hairy, large front eyes, daylight, jumps
Zebra jumping spider, Salticus scenicus	Females 4.3 to 6.4 millimeters, males 4 to 5.5 millimeters	Stripes and a front band, not round spots	Small, slender, wall and fence hunter
Brilliant jumping spider, Phidippus clarus	Males smaller than females	White front band plus pairs of small white spots, with reddish orange stripes in males	Field and plant hunter, often not mainly black
False widow, Steatoda species	Varies, generally small widow sized or smaller	Pale band or crescent on top of a dark, glossy abdomen	Tangled cobweb, dark sheltered sites, no red hourglass below
Spotted orbweaver, Neoscona crucifera	Females about one third to three fourths inch, males smaller	Cross like top marks, plus two white spots below	Usually orange or brown, round web at night
True widow, Latrodectus species, adult female	Western females about one fourth to one third inch; southern females 5.0 to 13.5 millimeters	Red or red orange hourglass below, sometimes as two spots or faint	Shiny black, bulbous abdomen, tangled web near ground

The strongest identifications come from several columns agreeing at once: size, mark shape, body shape, and behavior.

Candidate 1: Bold Jumping Spider, Phidippus audax

The bold jumping spider is the candidate most readers mean, and the one with the clearest match to the words themselves. Penn State Extension calls Phidippus audax the most commonly encountered jumping spider in and around Pennsylvania homes, with a range from Canada and the Atlantic Coast states west to California. Its habit of hunting in daylight around houses, fences, and gardens explains why it is seen so often.

Penn State Extension describes it as a black, hairy spider, with females 8 to 19 millimeters and males 6 to 13 millimeters. There is a pattern of white, yellow, or orange spots on the top of the abdomen, with orange on younger spiders. The chelicerae frequently have an iridescent green hue. Males have tufts of hairs over the eyes, and white bands may extend back from the rear pair of eyes. The eyes at the center of the front end of the cephalothorax are by far the largest.

In practice, a bold jumper often looks like a compact, fuzzy, black spider with one larger central spot and smaller spots behind it. Spot number and shape vary, and juveniles commonly show orange spots that fade to white as they mature. That age change is a common source of confusion.

Behavior helps as much as appearance. Penn State Extension notes that jumping spiders require daylight to hunt, and that bold jumpers can be found on windowsills, tree trunks, and deck railings, under stones, and in other locations during daylight hours. They do not build a web to catch prey. They stalk and pounce. A black spider with white spots walking or jumping in sunlight on a vertical surface, turning to face movement, fits this candidate well. A spider that stayed in a tangled web in a dark corner fits it poorly, whatever its spots looked like.

Candidate 2: Zebra Jumping Spider, Salticus scenicus

The zebra jumping spider is smaller, slimmer, and more striped than spotted, but it is included because many readers describe its white bars as spots at a glance. Penn State Extension gives its scientific name as Salticus scenicus, places it in the jumping spider family Salticidae, and describes it as a non native species introduced from Eurasia, now found throughout most of the United States and southern Canada, more commonly in the Northeast and West Coast, with very few records from the Southeast and Plains states.

Size separates it first. Penn State Extension gives females as 4.3 to 6.4 millimeters and males as 4 to 5.5 millimeters, roughly half the length of a large female bold jumper. A tiny black spider with white marks on a wall is more likely a zebra jumper than a bold jumper, especially if it looks slender rather than stocky.

Pattern separates it second. Penn State Extension describes a white lateral band on the cephalothorax, with additional white hairs in the eye region, and white or light colored hairs on the abdomen arranged in opposing stripes with a band around the front end. Females are often lighter than males, and males have very large, dark chelicerae that project forward. If the pale marks clearly form cross bars, the zebra jumper moves up the list. If they are clearly round spots, it moves down.

Habitat supports the same distinction. Penn State Extension notes that the zebra jumper is frequently found under stones, in high grass, on bushes and fences, and inside and outside buildings, with a retreat often spun between cracks in boards. Like other jumping spiders, it hunts in daylight and does not sit in a prey catching web. If the spider was small, slender, striped, and active on a wall or fence in daylight, consider the zebra jumper first.

Candidate 3: Brilliant Jumping Spider, Phidippus clarus

The brilliant jumping spider, Phidippus clarus, is a cautionary candidate. It shows white spots and belongs to the same genus as the bold jumper, and it is common in old fields and on plants in eastern North America. But it is not usually a mainly black spider, so it should not be the first guess for a spider that looked solid black.

Accounts summarized for this article describe the male as mostly black on the front body, with a white band around the front of the abdomen, broad reddish orange stripes along each side of the abdomen, and four pairs of small white spots beside thin black stripes near the middle. Females vary more, from male like coloring to lighter shades of gray, tan, brown, and orange. The legs are short, hairy, and black, with pale bands near the end of each segment.

A male brilliant jumper therefore shows white spots, but also strong reddish orange stripes. A light form female may show white spots on a gray or tan background, which does not match a black spider at all. If the spider you saw was black with white spots and no reddish orange stripes, the brilliant jumper is a weaker match than the bold jumper.

Candidate 4: False Widows, Steatoda Species

False widows are the candidates most likely to cause worry, because they look like widows and live in similar places, but they are not true widows. The detailed species profile is the subject of the companion article AMB-371. This section gives only the summary needed to separate a false widow from the other candidates here, and does not repeat that profile.

Colorado State University Extension, in its account of the western widow spider, describes the cobweb spiders most easily confused with widows as similarly black with the same enlarged abdomen as widow spiders, but lacking the orange red hourglass on the underside, having prominent white markings on the top of the abdomen, and often having a white band around the front edge of the abdomen. It adds that related cobweb spiders found in homes are the same general shape as widows, but smaller, and either mottled brown or dark brown or black with a white band around the front of the abdomen, and that they invariably lack the underside hourglass pattern or bright coloring of immature and male widow spiders.

That gives three practical tests. First, a dark, glossy, rounded spider in a tangled web with a clear white band across the front of the abdomen fits a false widow better than a bold jumping spider, which does not sit in such a web. Second, check the underside safely, without handling, for example through glass. Absence of a red hourglass supports a false widow, although absence alone is not proof, because the hourglass can be faint in some true widows. Third, note the web: tangled and irregular, not round, and not absent.

Age changes the picture, because older false widows may lose much of their pattern and look plain black, brown, or purplish. The web, body shape, and underside pattern then carry more weight than white marks alone. False widows are commonly found in dark corners, closets, storage areas, sheds, garages, and window frames, and in gardens under logs or stones, a habitat that overlaps with true widows. For the full species account, see AMB-371.

Candidate 5: Spotted Orbweaver, Neoscona crucifera

The spotted orbweaver, also called Hentz orbweaver, is included mainly to rule it out. It has white spots, but it is not usually a black spider, and its web and behavior are distinctive.

The Illinois Department of Natural Resources describes Hentz orbweaver, Neoscona crucifer, as common and native in Illinois, with females about one third to slightly over three fourths inch long and males about two tenths to about six tenths inch. Most individuals are some shade of orange or brown, although some have no markings and others have very distinct markings. Many have a light mark down the center of the abdomen with side marks that may form a cross. The legs have alternating light and dark bands. The underside of the abdomen is black with two white spots.

Two warnings follow. First, the top is usually orange or brown, not black. Second, the two white spots are on the underside, not the top, so a reader who saw the spider from below might describe it as spotted even though the top was brown.

Behavior confirms it. The Illinois account notes that adults are active from late summer through fall, build a new web each evening, with a web up to two feet in diameter, and are active at night. A large spider sitting head down in a round, wheel shaped web at dusk or at night fits an orbweaver, not a jumping spider or a cobweb spider, because jumping spiders do not build prey catching webs and cobweb spiders do not build round orb webs.

How True Black Widows Differ

True black widows belong to the genus Latrodectus. Alabama Cooperative Extension describes the black widow female, Latrodectus mactans, as most easily recognized by her shiny black body and red hourglass marking on the underside of her abdomen, noting that the red marking can also be two separate spots of red. It gives females as 5.0 to 13.5 millimeters and males as 3.0 to 5.0 millimeters, and notes that immature spiders start yellowish white and acquire more black and red with each molt.

Colorado State University Extension, describing the western widow, states that the distinguishing feature of all widows is a red or red orange hourglass on the underside, but that the pattern can be highly variable in the western widow: two unconnected spots, a roughly rectangular area, or so faint as to be barely visible, with color that may fade or intensify over life. Mature females are round with a bulbous abdomen, usually about one fourth to one third inch long, distinctively shiny and dark, generally black or occasionally dark brown.

The rule for this article is therefore clear: white spots on top are not the mark of an adult female black widow. Her mark is red or red orange, and it is underneath. A black spider with white spots on top, a hairy body, and large front eyes points toward a jumping spider, not toward an adult female widow.

There are exceptions involving spiders that are not adult females. Immature widows and adult male widows may have red, red orange, or yellow spots and stripes on top, according to Colorado State University Extension, while the underside hourglass occurs throughout their development. Detailed male black widow appearance is covered in the separate article AMB-140, which this article does not repeat. The general point is enough here: a small, patterned spider in or near a widow web, with an underside hourglass, is in widow territory, while a large, hairy, jumping spider with white spots on top and no web is not.

Alabama Cooperative Extension describes the black widow web as an irregular, tangled mesh, usually built in dark, quiet, undisturbed areas such as under rocks, in woodpiles, or under or around houses. A spider in such a web deserves a careful check of the underside, from a safe distance and without handling. This section is about identification only. It does not diagnose, assess, or advise on any bite.

Young, Worn, And Misread Patterns

Patterns change with age, sex, molting, and wear, and those changes cause most confusion here. Bold jumping spider juveniles often have orange spots that become white as they mature. Black widow juveniles start pale and patterned and darken with each molt. False widows may be strongly patterned when young and plain when old. A guide that only shows adults will fail for juveniles.

Sex matters too. Male bold jumpers have more contrasting markings. Male zebra jumpers have very large, dark mouthparts projecting forward. Male widows are much smaller than females.

Wear and lighting matter as well. Jumping spider markings are partly hairs and scales, which can wear thin, making a bright pattern look dull. Sunlight can wash out pale marks, and shade can darken the body. At a distance, stripes can look like spots, and spots can merge into a band. If you are unsure whether you saw spots or stripes, record that uncertainty. It tells an expert which candidates are still open, whereas a confident but wrong description can close the correct candidate out.

Where You Saw It, Features To Note, And Common Mistakes

Location is often the fastest filter. Sunny walls, fences, windowsills, tree trunks, and deck rails in daylight fit jumping spiders. Tangled webs in dark, undisturbed corners, woodpiles, sheds, garages, basements, and crawl spaces fit cobweb spiders. Round webs at dusk or at night, often near a porch light, fit orbweavers.

Region matters too. The bold jumper is widespread across much of the United States and southern Canada. The zebra jumper is widespread but apparently more common in the Northeast and West Coast and less common in the Southeast and Plains states, according to Penn State Extension. A candidate that does not occur in your region should be treated with caution, even if the photograph looks similar.

If you see such a spider again, note in order: body size excluding legs; number, shape, and arrangement of the pale marks; top or underside; body shape; eyes; mouthparts; legs; web type; place; time and season; behavior; and region. Photographs should, where possible, show the top, the face, and the web, all from a safe distance and without handling the spider.

Do not handle a spider to get a better photograph. A disturbed spider shows fewer marks, and handling adds unnecessary risk. If you cannot answer most of the checklist, that is itself a finding: the sighting supports a family level identification, such as “jumping spider,” but not a species name. That is a normal and honest outcome.

The most common mistakes are calling any black spider in a web a black widow, calling any black spider with white spots a bold jumper without checking size and behavior, treating one spot as a complete pattern, and ignoring age. Expert help is valuable when the underside mark is unclear, when two candidates match equally well, or when an accurate name is needed for a record. Local extension services and natural history museums often accept spider photographs, with size, location, date, habitat, and behavior included.

Frequently Asked Questions

What is the most common black spider with white spots?

In much of the United States, the most common match is the bold jumping spider, Phidippus audax, especially for a black, hairy spider seen in daylight on a wall, fence, or windowsill with white spots on top of the abdomen. Penn State Extension describes it as the most commonly encountered jumping spider in and around Pennsylvania homes. “Most common” is not “certain,” and size, behavior, and location should still be checked.

Is a black spider with white spots a black widow?

Usually, no, if the white spots are on top and the spider is hairy, compact, and active in daylight. An adult female black widow is usually shiny black with a red or red orange hourglass underneath, not white spots on top. Immature widows and male widows can be patterned on top, so a small patterned spider in a widow web needs a check of the underside and the web. Male detail is in AMB-140, which this article does not repeat.

What is the difference between white spots and white stripes?

Spots are round or oval marks. Stripes are longer bars across or along the body. That difference separates the bold jumping spider, which typically shows spots, from the zebra jumping spider, which typically shows stripes and bands. At a distance, stripes can look like spots, so check size as well: zebra jumpers are much smaller than bold jumpers.

Can a black spider with white spots be a false widow?

Yes, if it is dark and glossy with a rounded abdomen, sits in a tangled cobweb in a dark, sheltered place, and shows a pale band or pale marks on top. Colorado State University Extension notes that cobweb spiders confused with widows often have a white band around the front of the abdomen and prominent white markings on top, but lack the orange red hourglass underneath. The full profile is in AMB-371, which this article does not duplicate.

What if the spider has only one white spot?

One visible spot is not enough for a species identification on its own. It may be one spot of a larger pattern partly hidden by angle, shadow, a leg, or wear. Note size, body shape, eyes, web, location, and behavior, and photograph the spider from more than one angle if you can do so safely.

Do black spiders with white spots build webs?

It depends on the candidate. Jumping spiders do not build webs to catch prey, although they use silk for retreats and safety lines. Cobweb spiders, including false widows and true widows, build tangled, irregular webs. Orbweavers build round, wheel shaped webs. The web, or its absence, is therefore one of the most useful clues.

Should I handle a spider to identify it?

No. Do not handle a spider to get a better look or photograph. Observe from a safe distance, take photographs without touching the spider, and note size, marks, web, location, and behavior. A clear photograph with location and behavior notes is more useful to an expert than a handled spider.

Sources & references

• Penn State Extension. Bold Jumper Spider. https://extension.psu.edu/bold-jumper-spider
• Penn State Extension. Zebra Jumper. https://extension.psu.edu/zebra-jumper
• Colorado State University Extension. Western Widow Spider. https://extension.colostate.edu/resource/western-widow-spider/
• Alabama Cooperative Extension System. The Black Widow. https://www.aces.edu/blog/topics/home/the-black-widow/
• Illinois Department of Natural Resources. Hentz's Orbweaver. https://dnr.Illinois.gov/education/wildaboutpages/wildaboutinvertebrates/wildaboutspiders/family-araneidae/wasphentzsorbweaver.html
• Minnesota Seasons. Brilliant Jumping Spider (Phidippus clarus). http://www.minnesotaseasons.com/Arachnids/brilliant_jumping_spider.html
• Peckhamia 113.1. Notes on Phidippus clarus. https://www.peckhamia.com/peckhamia/PECKHAMIA_113.1.pdf