B
Species Profile

Black Wasp

Sphex pensylvanicus

Katydid hunter, flower visitor
Natalia Kuzmina/Shutterstock.com

Black Wasp Distribution

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Found in 49 locations

Great black wasp on the mint flowers

At a Glance

Wild Species
Also Known As Great black digger wasp, Black digger wasp, Great black sphecid wasp, Digger wasp
Activity Diurnal
Lifespan 6 years
Status Not Evaluated
Did You Know?

Adult length is commonly reported at ~19-28 mm for females and ~13-20 mm for males (taxonomic descriptions/field keys).

Scientific Classification

The Great Black Wasp (Sphex pensylvanicus) is a solitary digger wasp native to North America. Females excavate burrows and provision nests with paralyzed katydids or related orthopterans for their larvae. Adults commonly visit flowers for nectar and are generally non-aggressive away from the nest.

Kingdom
Animalia
Phylum
Arthropoda
Class
Insecta
Order
Hymenoptera
Family
Sphecidae
Genus
Sphex
Species
pensylvanicus

Distinguishing Features

  • Large, uniformly black solitary wasp
  • Smoky to dark, often iridescent wings
  • Ground-burrowing “digger” nesting behavior
  • Preys mainly on katydids for nest provisioning

Physical Measurements

Males and females differ in size

Length
1 in (1 in – 1 in)
1 in (1 in – 1 in)
Venomous

Appearance

Primary Colors
Secondary Colors
Skin Type Chitinous exoskeleton
Distinctive Features
  • Large solitary wasp; adult length ~2-3.5 cm (female).
  • Male smaller; typically ~2.0-2.5 cm body length.
  • Narrow petiole creates a distinct "thread-waist" profile.
  • Robust, spiny legs suited for digging and soil excavation.
  • Smoky, darkened wings held flat over abdomen at rest.
  • Powerful mandibles for gripping and transporting katydid prey.
  • Antennae long and filiform; males often appear more slender.
  • Female terminal sting/ovipositor visible when abdomen flexed.

Sexual Dimorphism

Females are typically larger and more robust, bearing a functional sting/ovipositor used in prey paralysis and nesting defense. Males are smaller, slimmer, and lack a sting; their abdomen tip is blunter.

  • Smaller, slimmer overall build; narrower abdomen.
  • No functional sting; blunt terminal abdominal tip.
  • Often proportionally longer, more conspicuous antennae.
  • Larger, heavier-bodied; broader abdomen for egg production.
  • Functional sting/ovipositor at abdomen tip.
  • More robust legs and mandibles for burrow provisioning.

Did You Know?

Adult length is commonly reported at ~19-28 mm for females and ~13-20 mm for males (taxonomic descriptions/field keys).

Each brood cell typically gets 1 egg laid on a katydid; several paralyzed prey may be stored per larva.

Females sting prey to induce long-lasting paralysis, keeping katydids fresh for the developing larva (Evans & O'Neill, 1988).

Adults feed mainly on nectar and are frequent visitors to late-summer flowers like goldenrod and mountain mint.

They are solitary: no workers, no shared hive, and each female provisions only her own underground nest.

In much of its range, it is effectively univoltine; larvae overwinter in the nest and emerge the next warm season (O'Neill, 2001).

Unique Adaptations

  • Venom is specialized to paralyze orthopteran prey without killing it, preventing decay during larval feeding.
  • Spiny legs and strong thoracic muscles aid digging and rapid soil removal when constructing burrows.
  • Robust mandibles and neck musculature allow hauling prey nearly as large as the wasp.
  • Landmark-based navigation and route memory help females relocate inconspicuous nest entrances after long foraging flights.
  • Dark body coloration can speed warming in sunlit habitats, extending daily activity in cooler late-summer conditions.

Interesting Behaviors

  • Females excavate soil burrows with side cells, then temporarily plug the entrance between hunting trips.
  • A hunting female drags a paralyzed katydid across the ground, often pulling by an antenna to steer it.
  • Before leaving, females perform short orientation flights to memorize landmarks around the nest entrance.
  • Away from nests, adults usually ignore people; defensive stinging is mainly a near-burrow response.
  • Provisioning follows a set sequence: capture prey, transport, place in cell, lay egg, then seal the cell.

Cultural Significance

Often cited in North American nature education as a "solitary wasp" model: a beneficial predator of katydids and a nectar-feeding flower visitor, illustrating how wasps can be non-aggressive pollinator associates.

Myths & Legends

The genus name Sphex comes from ancient Greek "sphēx," meaning "wasp," reflecting a long classical tradition of naming stinging insects from Greek natural history terms.

Jean-Henri Fabre's famous 19th-century "Sphex" hunting stories (about related Sphex wasps) became enduring cultural touchstones in debates about instinct and animal behavior.

The species epithet "pensylvanicus" memorializes Pennsylvania in early American taxonomy, a naming tradition that tied new North American insects to place and discovery history.

Conservation Status

NE Not Evaluated

Has not yet been evaluated against the criteria.

Population Unknown

Life Cycle

Birth 1 larva
Lifespan 6 years

Lifespan

In the Wild
1–8 years
In Captivity
2–12 years

Reproduction

Mating System Polygynandry
Social Structure Aggregation Group
Breeding Season Mid-summer to early fall (June-September)
Breeding Pattern Transient
Fertilization Internal Fertilization
Birth Type Internal_fertilization

Males patrol and sometimes defend small territories near nesting aggregations and attempt repeated copulations with multiple females; there is no pair bond. Females mate briefly, store sperm, and provision and rear each brood alone in burrows.

Behavior & Ecology

Social Solitary Group: 1
Activity Diurnal
Diet Insectivore Katydids
Seasonal Hibernates

Temperament

Non-aggressive
Nest-defensive
Site-faithful
Territorial

Communication

wing buzz
chemical cues
antennation
body posture
visual landmarks

Habitat

Biomes:
Temperate Forest Temperate Grassland
Terrain:
Plains Valley Hilly Coastal Riverine Sandy Rocky +1
Elevation: Up to 6561 ft 8 in

Ecological Role

Solitary predator of katydids; incidental pollinator

arthropod population control pollination

Diet Details

Main Prey:
Katydids Angle-winged katydid Conehead katydids True katydids
Other Foods:
Flower nectar Honeydew

Human Interaction

Domestication Status

Wild

Not domesticated. Solitary North American digger wasp; females ~20-28 mm, males ~18-23 mm (Bohart & Menke 1976; Krombein 1979). Nests provisioned with paralyzed katydids; adults nectar-feed and are typically non-aggressive away from burrows.

Danger Level

Low
  • Painful defensive sting if handled
  • Nest-guarding females near burrows
  • Allergic reaction (rare anaphylaxis)

As a Pet

Not Suitable as Pet

Legality: Generally legal; collecting restricted in many protected areas.

Care Level: Expert Only

Purchase Cost: Up to $50
Lifetime Cost: $100 - $500

Economic Value

Uses:
Biocontrol Pollination Education Research

Relationships

Predators 6

Eastern kingbird
Eastern kingbird Tyrannus tyrannus
Golden silk orb-weaver
Golden silk orb-weaver Trichonephila clavipes
Yellow garden spider
Yellow garden spider Argiope aurantia
Red-footed cannibalfly Promachus rufipes
Chinese mantis Tenodera sinensis
Eastern velvet ant Dasymutilla occidentalis

Related Species 4

Great golden digger wasp Sphex ichneumoneus Shared Genus
Silver sphex wasp Sphex argentatus Shared Genus
Yellow-winged sphex wasp Sphex flavipennis Shared Genus
Black-and-yellow mud dauber Sceliphron caementarium Shared Family

Ecological Equivalents 4

Animals that fill a similar ecological role in their ecosystem

Mexican grass-carrying wasp Isodontia mexicana Solitary wasp provisioning nests with paralyzed katydids/orthopterans.
Sand wasp Tachytes obscurus Ground-nesting solitary wasp that provisions burrows with grasshoppers.
North American sand wasp Prionyx canadensis Solitary digger wasp; stocks burrows with paralyzed orthopterans.
European mantis Mantis religiosa Shared habitat; frequent predator-prey interactions with large wasps.

The black wasp, which is often referred to as the Great Black Wasp, is rather small, and it is grouped with other insects under the digger wasp species.

They go by the scientific name Sphex pensylvanicus. They are found all across North America. They are found all over the United States, spanning from the west coast to the east coast. They survive in many different climates because of their adaptability. The western United States is their preferred environment, due to the warmth.

5 Incredible Black Wasp Facts!

Great black wasp on the mint flowers

More than twice as large as their male counterparts are the female enormous black wasps. The males, meanwhile, are quite tiny.

Here are a few interesting facts about black wasps:

  • The female great black wasps are much bigger than the male great black wasps. However, the males are surprisingly small.
  • These insects can grow up to 1.3 inches in length.
  • When the Great Black Wasp is stunned, it will appear to be dormant and motionless. However, they are still alive and very dangerous.
  • The black wasp is a subterranean insect, which means that they usually stay under the ground.
  • They belong to a species of digger wasp.

Evolution and Origins

While the phrase “black wasp” can be used for many different species of wasp, in general, wasps are believed to have evolved from a common ancestor with bees and ants around 100 million years ago during the Cretaceous period.

Black wasps, like all wasps, have undergone significant changes and adaptations over millions of years to fit into different environments and better survive in different situations.

Symphyta, a group of Hymenoptera that includes Xyelidae, was first found in fossil records during the Lower Triassic period. Apocrita, which includes a variety of wasps, first appeared in the Jurassic period and by the Cretaceous period, had developed into many different superfamilies.

They are believed to have evolved from the Symphyta group.

Species, Types, and Scientific Name

Great Black Digger Wasp on Goldenrod Flowers

Sphex pensylvanicus is the scientific name for these insects.

These insects are known by the scientific name Sphex pensylvanicus. They belong to the species of digger wasp and are known to be found across North America. The females of the species are bigger than the males of the species.The word “sphex” is very direct, and it is the literal word for “wasp” in Ancient Greece. The word “pensylvanicus” is a variation of Pennsylvania, which is an eastern state in the United States. Most often, this word is used to describe a species that is native to Pennsylvania, so it may be included in the name because there are 65 different species of great black wasps in the state.

Different Types

  • Asian giant hornet
  • Polybia occidentalis
  • Common wasp
  • German wasp
  • Asian hornet
  • European hornet
  • Vespa affinis
  • Red paper wasp
  • Polistes canadensis
  • Australian hornet
  • Vespula rufa
  • Eastern cicada killer
  • Polistes carnifex
  • Bald-faced hornet
  • Polistes humilis
  • Oriental hornet
  • Red velvet ant
  • Emerald cockroach wasp
  • Synoeca septentrionalis
  • Austroscolia soror
  • Northern paper wasp
  • Synoeca cyanea
  • Common paper wasp
  • Andricus quercuscalicis
  • Chalybion californicum
  • Asian paper wasp
  • Organ pipe mud dauber
  • Pepsis heros
  • Megascolia maculata
  • European paper wasp
  • Vespa simillima
  • Blue ant
  • Mexican honey wasp
  • Euspinolia militaris
  • European beewolf
  • Evania appendigaster
  • Vespa dybowskii
  • Vespa ducalis
  • Brachygastra lecheguana
  • Dolichovespula arenaria
  • Eastern yellowjacket
  • Blue-winged wasp
  • Western yellowjacket
  • Diplolepis rosae
  • Black-bellied hornet
  • Cynips quercusfolii
  • Solitary wasp
  • Ampulex dementor
  • Dolichovespula sylvestris
  • Dolichovespula saxonica
  • Stilbum cyanurum

Appearance

Great black wasp close-up

The huge black wasp is, as its name implies, black.

As the name suggests, the great black wasp is black. Unlike other wasps, these wasps do not have any markings or stripes on their bodies, which makes them relatively easy to identify. These insects have a traditional body for a wasp with large wings and a narrowed midsection in their small body. Their entire abdomen is a deep black hue.

The female black wasp is easily the more unique of the species, showing an incredible size advantage over the male. The species often measures between 1 and 1.3 inches, though the female great wasp protects itself with a powerful and threatening stinger.

These wasps appear to have a semi-gloss black appearance, made only starker by the way that the wings can fold flat onto their body. Their spiny legs can make the insect seem even more intimidating.

These insects are relatively solitary, grouped with other wasps that hunt and sting.

Diet

The huge black wasps are insects that live underground, which enables them to establish a home below the surface of their climate.

The great black wasps are subterranean insects, allowing them to make a home beneath the surface of their climate. This area is the best place for them to build a nest and care for their young.

These insects are natural hunters, which is why they will go after grasshoppers, cicadas, locusts, katydids, and other fleshy insects. In some cases, these wasps will also consume their own young before they are ready to fend for themselves.

Prevention

warrior wasp

It may be advisable to use a non-insecticide spray to repel these bugs or a nest in the most compassionate manner possible.

As much as co-living in the environment is important, these insects could be a nuisance that is threatening your ability to safely be at home. Leaving them to thrive in the home can cause irritation or discomfort, much like the other insects that might surround you.

For the most humane way to deter these bugs or a nest, a non-insecticide spray may be the best way to get rid of them. This spray stops the insect from being able to fly. There are also non-toxic mint sprays that can be used in the home and garden, protecting plants from damage as well. In some cases, it is possible to use a cleaning spray to saturate the wasps.

If getting rid of it alive is not an option for you, you could hit them with a heavy object. This would most likely kill the wasp. It is important to note that flyswatters do not usually work with the great black wasps.

If you are not scared of the insect, you could pick it up with the help of gloves and can push it into a fly swatter, and then take it outside your home. Interestingly, it could be difficult to determine if the wasp is dead as it can only be stunned and can still be motionless.

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Sources

  1. Western Exterminator Company / Accessed June 7, 2021
  2. Field Station / Accessed June 7, 2021
  3. Hunker / Accessed June 7, 2021
Rebecca Bales

About the Author

Rebecca Bales

Rebecca is an experienced Professional Freelancer with nearly a decade of expertise in writing SEO Content, Digital Illustrations, and Graphic Design. When not engrossed in her creative endeavors, Rebecca dedicates her time to cycling and filming her nature adventures. When not focused on her passion for creating and crafting optimized materials, she harbors a deep fascination and love for cats, jumping spiders, and pet rats.
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Black Wasp FAQs (Frequently Asked Questions)

While the sting of the great black wasp can be painful, these insects are not considered to be fatally dangerous to humans (unless the individual has an allergy).