Solitary-wasp
Guides
Anoplius cleora
Anoplius cleora is a species of spider wasp in the family Pompilidae. It is closely related to and morphologically similar to Anoplius aethiops, requiring microscopic examination to distinguish between the two. The species is associated with open sand dune habitats, where it replaces its congener A. aethiops. Like other members of the genus, it is a solitary hunter that provisions underground nests with paralyzed wolf spiders as food for its larvae.
Anoplius ithaca
Anoplius ithaca is a species of spider wasp in the family Pompilidae. Very little specific information is available for this species. Based on its classification within the genus Anoplius, it likely shares the general biology of other members of this genus: females hunt spiders, paralyze them with venom, and provision underground burrows as food for their larvae. The species was described by Nathan Banks in 1912.
Anoplius nigritus
Anoplius nigritus is a species of spider wasp in the family Pompilidae. As a member of the genus Anoplius, it shares the general biology of other spider wasps in this group: females hunt spiders, paralyze them with venom, and provision underground burrows as food for their developing larvae. The species has been recorded from Brazil (Rio Grande do Sul) and Argentina, placing it in the southern Neotropical region. Specific details about its appearance, host preferences, and behavior remain poorly documented in available literature.
Anoplius semirufus
Anoplius semirufus is a species of spider wasp in the family Pompilidae. As a member of the genus Anoplius, it belongs to a diverse group of solitary wasps that prey primarily on spiders. The species name 'semirufus' (half-red) suggests distinctive reddish coloration on part of the body, likely the abdomen. Like other Anoplius species, it is presumed to hunt wolf spiders or similar ground-dwelling spiders, paralyzing them with venom to provision underground nest cells for its larvae.
Anoplius subcylindricus
Anoplius subcylindricus is a species of spider wasp in the family Pompilidae. It belongs to a diverse genus of solitary wasps that prey primarily on spiders. Like other members of Anoplius, this species exhibits the characteristic behaviors of spider wasps: females hunt spiders, paralyze them with venom, and provision underground burrows with these paralyzed prey for their larval offspring. The species was described by Nathan Banks in 1917.
Anoplius toluca
Anoplius toluca is a spider wasp species in the family Pompilidae, first described by Cameron in 1893. As a member of the genus Anoplius, it belongs to a diverse group of solitary wasps that prey primarily on spiders. The species is recorded from Hawaii, though detailed biological information appears limited in available sources. Like other Anoplius species, it likely exhibits the characteristic hunting behavior of paralyzing spiders with its sting to provision nests for its larvae.
Anoplius virginiensis
Virginia Blue-black Spider Wasp
Anoplius virginiensis is a spider wasp in the family Pompilidae. Members of the genus Anoplius are solitary wasps that prey on spiders, paralyzing them with venom to serve as food for their larvae. The species was described by Cresson in 1867 and is known from limited observations.
Anteon osborni
Anteon osborni is a species of dryinid wasp in the family Dryinidae, subfamily Anteoninae. First described by Fenton in 1918, this species belongs to a genus of parasitoid wasps known for their distinctive raptorial forelegs used to capture and hold host prey. Dryinid wasps are solitary parasitoids that primarily target Hemiptera, particularly leafhoppers and planthoppers. The genus Anteon is one of the most diverse within Dryinidae, with species distributed across multiple continents.
Aphilanthops
ant-queen kidnapper
Aphilanthops is a genus of solitary digger wasps endemic to North America, commonly known as "ant-queen kidnappers." The four described species are specialized predators of winged ant queens, particularly in the genus Formica. Adult females hunt during ant nuptial flights, paralyze ant queens, and transport them to underground nest burrows where they serve as provisions for developing larvae. The genus is distinguished from similar beewolf wasps (Philanthus) by straight rather than notched inner eye margins.
Aphilanthops frigidus
Eastern Ant-Queen Kidnapper
Aphilanthops frigidus is a solitary wasp in the family Crabronidae, commonly known as the Eastern Ant-Queen Kidnapper. The species is endemic to North America and specializes in hunting winged queens of ants in the genus Formica. Females excavate individual nest burrows in sandy soil, provisioning brood cells with paralyzed ant queens for their larvae. The species is active primarily during the summer months when ant colonies undergo their annual nuptial flights.
Aphilanthops hispidus
ant-queen kidnapper
Aphilanthops hispidus is a solitary wasp species in the family Crabronidae, known as an "ant-queen kidnapper" for its specialized predation on winged queens of ants in the genus Formica. The species occurs in North America, including the southwestern United States and Mexico, and has been documented as abundant on flowers of seepwillow (Baccharis salicifolia) during late summer months. Adult females excavate underground burrows to store paralyzed ant queens as food for their developing larvae.
Aphilanthops subfrigidus
Western Queen Ant Kidnapper
Aphilanthops subfrigidus, known as the Western Queen Ant Kidnapper, is a solitary wasp in the family Crabronidae. Like other members of its genus, this species is a specialist predator of winged ant queens, particularly those in the genus Formica. The wasp hunts during the brief annual swarming period of ant colonies, paralyzing queens and transporting them to underground nest burrows as provisions for its larvae. It is native to western North America and is most commonly encountered when adults visit flowers for nectar.
Apopria coveri
Apopria coveri is a species of velvet ant (family Mutillidae), a group of solitary wasps known for their striking aposematic coloration and powerful sting. Females are wingless and resemble large, hairy ants, while males possess wings. The genus Apopria is part of the subfamily Sphaeropthalminae, which is primarily distributed in the New World. Like other mutillids, this species is likely parasitoid, with females seeking out ground-nesting hosts such as solitary bees or wasps to deposit their eggs.
Aporinellus basalis
Aporinellus basalis is a species of spider wasp in the family Pompilidae, described by Banks in 1933. Members of the genus Aporinellus are solitary wasps that hunt spiders to provision nests for their larvae. The species is part of the diverse aculeate wasp fauna of North America. Like other pompilids, females paralyze spiders with their sting and cache them as food for their developing offspring.
Aporinellus fasciatus
Aporinellus fasciatus is a species of spider wasp in the family Pompilidae, described by Smith in 1855. Members of this genus are solitary wasps that hunt spiders as prey for their larvae. The specific epithet "fasciatus" refers to a banded appearance, though detailed descriptions of this species' morphology are limited in available sources. Like other pompilid wasps, it likely exhibits the characteristic behaviors of spider wasps, including paralyzing spiders to serve as living food stores for developing offspring.
Aporinellus taeniatus
Aporinellus taeniatus is a species of spider wasp in the family Pompilidae, first described by Kohl in 1886. The species belongs to a genus of solitary wasps known for hunting spiders as prey for their larvae. Like other members of Pompilidae, this species exhibits the characteristic wasp-waisted body form and possesses a sting used to paralyze host spiders. The specific epithet 'taeniatus' refers to a banded or striped appearance, suggesting distinctive coloration patterns on the body.
Aporinellus yucatanensis
A species of spider wasp in the family Pompilidae, described from the Yucatán Peninsula of Mexico in 1893. As a member of Aporinellus, it is presumed to be a solitary wasp that hunts spiders as prey for its larvae, though specific biological details remain undocumented. The species is known from very few records, with minimal observational data available.
Aporus luxus
Aporus luxus is a small spider wasp in the family Pompilidae, recognized by its iridescent blue-black coloration and streamlined body form. Adults measure 8-15 mm in length and are frequently observed on flowers, particularly umbellifers such as Queen Anne's Lace (Daucus carota), where they feed on nectar. The species is a specialist parasitoid of trapdoor spiders in the family Euctenizidae, with at least one confirmed record of rearing from Aptostichus sp. Females sting spiders into paralysis and deposit a single egg on the host within the spider's own burrow.
Arachnospila arcta
Arachnospila arcta is a species of spider wasp in the family Pompilidae, first described by Cresson in 1865. The species is currently treated as a synonym of Arachnospila arctus. Members of this genus are solitary wasps that provision nests with paralyzed spiders. The taxon has been documented in very few observations, suggesting it is either rare, undercollected, or primarily of historical taxonomic interest due to its synonym status.
Arachnospila scelestus
Arachnospila scelestus is a species of spider wasp in the family Pompilidae. The species was originally described as Pompilus scelestus by Cresson in 1865 and later transferred to the genus Arachnospila. As with other members of this family, it is presumed to be a solitary wasp that hunts spiders to provision nests for its offspring, though specific natural history details for this species remain poorly documented. The species is currently treated as a synonym in some taxonomic databases, reflecting ongoing revisions within the genus.
Argogorytes nigrifrons
Argogorytes nigrifrons is a species of sand wasp in the family Crabronidae, subfamily Bembicinae. It was described by Frederick Smith in 1856. The species is known from North America, with confirmed records from Canada including New Brunswick. Like other members of the genus Argogorytes, it is a solitary wasp that nests in soil.
Astata
Astata is a cosmopolitan genus of solitary predatory wasps in the subfamily Astatinae, family Crabronidae. With 87 recognized species and subspecies worldwide, it is the largest genus in its subfamily. The genus is distinguished by distinctive wing venation patterns and pronounced sexual dimorphism in eye structure. Males possess exceptionally large compound eyes that meet dorsally at the top of the head, while females have normal, separated eyes.
Astata unicolor
Astata unicolor is a solitary, soil-nesting wasp in the family Crabronidae. It is sexually dimorphic: males have black abdomens and enlarged eyes that meet at the top of the head, while females have black and orange abdomens with normal, separated eyes. The species is a predator of stink bugs (Pentatomidae), with documented preference for late-instar nymphs and adults of the invasive brown marmorated stink bug (Halyomorpha halys). Females paralyze prey with a sting, transport it to underground nests, and provision cells for their larval offspring.
Astatinae
Astatina wasps
Astatinae is a cosmopolitan subfamily of solitary wasps in the family Crabronidae, comprising approximately 14 species in North America and additional species across Europe and Asia. The subfamily includes two primary genera: Astata and Dryudella. Males are readily distinguished by their holoptic eyes—enormous compound eyes that meet at the top of the head—and exceptionally broad hind wings that enable rapid flight. Females are fossorial, constructing multi-celled nest burrows in soil or sand and provisioning them with paralyzed true bugs (Hemiptera) as food for their larvae.
Auplopus
spider wasps
Auplopus is a large genus of small spider wasps in the family Pompilidae, distributed worldwide except Antarctica. Females construct distinctive barrel-shaped mud nests, often inside pre-existing cavities such as abandoned nests of other wasps, hollows in wood, or rock crevices. They hunt spiders, paralyze them with venom, and amputate the legs before transporting the prey to their nests. The wasps provision each mud cell with one or more paralyzed spiders, lay a single egg on the final victim, and seal the cell. Auplopus species are solitary and non-aggressive, with most activity occurring from May to October.
Auplopus architectus
Auplopus architectus is a small to medium-sized spider wasp in the family Pompilidae. Females construct distinctive barrel-shaped mud nests, often inside pre-existing cavities such as rock crevices, wood holes, or abandoned nests of other wasps. The species hunts spiders, amputates their legs to facilitate transport, and provisions each mud cell with multiple paralyzed victims before laying a single egg. Populations occur in disjunct regions of North America including California, the northeastern United States, and Arkansas.
Auplopus architectus architectus
Auplopus architectus architectus is a small spider-hunting wasp in the family Pompilidae. Females construct distinctive barrel-shaped mud cells to house their offspring, provisioning each cell with paralyzed spiders as food. The species is part of a genus known for unique nest-building behavior among pompilid wasps, which typically dig burrows rather than construct free-standing mud structures.
Auplopus architectus metallicus
Auplopus architectus metallicus is a subspecies of spider wasp in the family Pompilidae, tribe Auplopini. Like other Auplopus, females construct small, free-standing mud cells to house paralyzed spider prey and developing larvae. The subspecies was described by Banks in 1910. Members of this genus are small wasps, typically around 10 millimeters in length, with several species exhibiting bright metallic blue-green coloration.
Auplopus caerulescens
Blue Mud-dauber Spider Wasp
Auplopus caerulescens is a small spider-hunting wasp in the family Pompilidae, tribe Auplopini. Females construct distinctive barrel-shaped mud cells, typically 15 mm long and 7-10 mm wide, often placed inside pre-existing cavities such as hollows in wood, rock crevices, or abandoned nests of other wasps. The species is known for its bright metallic blue-green coloration, with females bearing a diagnostic pygidial plate used to manipulate mud during nest construction. It is widely distributed across North America.
Auplopus carbonarius
potter spider wasp, yellow-faced spider wasp
Auplopus carbonarius is a small spider wasp native to Europe that has been introduced to North America. Females construct distinctive barrel-shaped mud cells inside pre-existing cavities, stocking each with a paralyzed spider as food for their larva. The species is notable for its complex nesting behavior among Pompilidae, including leg amputation of prey to facilitate transport. Adults are approximately 10 mm in length, with males distinguished by ivory-colored maculae beside the eyes.
Auplopus mellipes
Red-legged Spider Wasp
Auplopus mellipes is a small spider wasp in the family Pompilidae, tribe Auplopini. Females construct distinctive barrel-shaped mud cells to house their paralyzed spider prey and developing larvae. The species has a widespread distribution across North America and is most active during summer months. Unlike many spider wasps that dig burrows, Auplopus species are unique among Pompilidae for their free-standing mud nest construction.
Auplopus mellipes mellipes
Auplopus mellipes mellipes is a small spider wasp in the family Pompilidae, tribe Auplopini. Females construct distinctive barrel-shaped mud cells to house their offspring, provisioning each cell with paralyzed spiders. The species belongs to a genus noted for opportunistic hunting of non-web-building spiders and for frequently utilizing pre-existing cavities or abandoned nests of other wasps as nest sites. Adults feed on honeydew from aphid colonies rather than visiting flowers.
Auplopus mellipes variitarsus
Auplopus mellipes variitarsus is a subspecies of small spider wasp in the family Pompilidae, tribe Auplopini. Females construct distinctive free-standing mud cells, typically barrel-shaped and approximately 15 millimeters long, to house paralyzed spider prey and a single offspring. The species exhibits bright metallic blue-green coloration, with females bearing a diagnostic pygidial plate on the abdomen used as a masonry trowel during nest construction. Like other Auplopus, this subspecies is solitary and non-aggressive, feeding on aphid honeydew as adults while provisioning nests with spiders from diverse families.
Auplopus mollis
Auplopus mollis is a small spider wasp in the family Pompilidae, tribe Auplopini. Females construct distinctive free-standing mud cells, typically barrel-shaped and approximately 15 mm long by 7–10 mm wide, often stacked end-to-end in rows of two to five. The species hunts non-web-building spiders, amputates their legs to facilitate transport, and provisions each mud cell with multiple paralyzed spiders before laying a single egg. Adults feed on aphid honeydew rather than visiting flowers.
Auplopus nigrellus
Auplopus nigrellus is a small spider wasp in the family Pompilidae, tribe Auplopini. Like other members of its genus, it constructs distinctive barrel-shaped mud cells to house its offspring. The species was described by Banks in 1911, though specific details about its biology are limited compared to better-studied congeners such as A. carbonarius and A. mellipes.
Belomicrus
Belomicrus is a genus of solitary wasps in the family Crabronidae, tribe Oxybelini. The genus was established by A. Costa in 1867. Species are known from Europe, Africa, and North America. Members of this genus are predatory wasps that provision their nests with paralyzed prey.
Bembecinus floridanus
sand wasp
Bembecinus floridanus is a small sand wasp in the family Crabronidae, first described by Krombein & Willink in 1951. As a member of the genus Bembecinus, it exhibits the characteristic traits of this group: strongly convergent eyes at the bottom of the face and strongly divergent at the top of the head, along with a petiolate or nearly petiolate second submarginal cell in the forewing. The species is found in North America and, like other Bembecinus, is a solitary ground-nesting wasp that provisions its larvae with prey.
Bembecinus neglectus
Bembecinus neglectus is a species of sand wasp in the family Crabronidae (formerly treated as Bembicidae). It was first described by Cresson in 1873 and is known to occur in North America. As a member of the tribe Bembicini, it belongs to a group of solitary wasps commonly associated with sandy habitats. The species has been documented in museum collections and through citizen science observations, though detailed biological studies remain limited.
Bembicini
Sand Wasps
Bembicini is a large tribe of solitary wasps commonly known as sand wasps, comprising approximately 20 genera distributed across multiple subtribes. These wasps are characterized by their ground-nesting behavior in sandy substrates and their role as predators provisioning nests with paralyzed insect prey. The tribe exhibits notable diversity in prey preferences, with most genera specializing on particular insect orders—most commonly Diptera, though some target Hemiptera, Orthoptera, or other groups. Many species form dense nesting aggregations where numerous females excavate burrows in close proximity, creating conspicuous colonies that attract specialized parasites and cleptoparasites.
Bembix
sand wasps
Bembix is a cosmopolitan genus of approximately 380 species of solitary predatory sand wasps in the family Crabronidae. These wasps are characterized by their large size, often bright coloration, and specialized nesting behavior in sandy substrates. Females excavate burrows in loose sand and provision them with paralyzed flies for their larvae, exhibiting progressive provisioning where prey is delivered as the larva develops. The genus has been documented across North America, Europe, southern Africa, and Australia, with species showing varying degrees of geographic restriction from widespread to narrowly endemic.
Bembix americana
American Sand Wasp
Bembix americana is a solitary digger wasp in the family Crabronidae, widely distributed across the Americas from the Caribbean to North and South America. Females construct burrows in loose sand where they provision cells with paralyzed flies as food for their larvae. The species exhibits notable parental care, with females progressively increasing prey deliveries as larvae grow. Seven subspecies are currently recognized, reflecting considerable geographic variation in morphology and nesting behavior.
Bembix americana comata
Western Sand Wasp
Bembix americana comata is a subspecies of sand wasp in the family Crabronidae, native to western North America. It is a solitary digger wasp that constructs burrows in loose sand to provision with paralyzed flies for its larvae. The subspecies is part of a variable species complex where nest architecture shows population-level variation in cell number. Adults are active during warmer months and are commonly observed on barren sand exposures.
Bembix americana hamata
Bembix americana hamata is a subspecies of sand wasp in the family Crabronidae. Adult females construct burrows in loose sand and provision them with paralyzed flies to feed their developing larvae. The subspecies is part of the broader B. americana complex, which includes several geographically variable forms across North America. Like other members of the genus, this wasp exhibits solitary nesting behavior with progressive provisioning—providing increasing numbers of prey items as the larva grows.
Bembix americana spinolae
Eastern Sand Wasp
A sand wasp subspecies common on barren sand exposures where females dig burrows into loose sand. Adults provision nests with paralyzed flies, with females providing progressively more prey as larvae grow. Formerly placed in family Sphecidae, now classified in Crabronidae. The subspecies is part of a variable species complex with intermediate characteristics between B. americana comata and B. americana spinolae in some populations.
Bembix amoena
sand wasp
Bembix amoena is a species of solitary sand wasp in the family Crabronidae, native to North America. Like other members of the genus Bembix, females construct burrows in sandy substrates and provision them with paralyzed flies to feed their larvae. The species exhibits progressive provisioning, where the mother continues to bring prey to her developing offspring. Adults of both sexes visit flowers for nectar, particularly composites in the Asteraceae family.
Bembix belfragei
A solitary sand wasp in the genus Bembix, characterized by ground-nesting behavior in loose, sandy substrates. Females excavate burrows to provision with paralyzed flies, exhibiting progressive parental care by delivering prey as larvae develop. Adults of both sexes visit flowers for nectar, particularly composites. The species is part of a diverse North American radiation of sand wasps with complex nesting behaviors.
Bembix nubilipennis
Bembix nubilipennis is a sand wasp in the family Crabronidae, first described by Cresson in 1873. Like other members of the genus Bembix, this species is associated with sandy habitats where females excavate burrows to provision with paralyzed flies as food for their larvae. The species is found in North America and Middle America, though specific behavioral and ecological details for this particular species remain limited in published literature. Most information about Bembix biology derives from studies of more common congeners.
Bembix occidentalis
sand wasp
Bembix occidentalis is a species of solitary sand wasp in the family Crabronidae. The species was described by W. Fox in 1893 and occurs in Central America and North America. Like other members of the genus Bembix, it is associated with sandy habitats where females excavate burrows to provision with prey for their larvae.
Bembix pallidipicta
A sand wasp species in the genus Bembix, first described by Frederick Smith in 1873. As with other members of this genus, females construct burrows in loose, sandy substrates and provision nests with paralyzed flies for their developing larvae. The species is part of a diverse group of solitary wasps known for their rapid, energetic movements and distinctive nesting behaviors.
Bembix rugosa
Bembix rugosa is a species of sand wasp in the family Crabronidae, described by J. Parker in 1917. As a member of the genus Bembix, it shares the characteristic behaviors of solitary digger wasps that excavate burrows in sandy substrates and provision nests with paralyzed flies for their larvae. The species occurs in North America, though specific details about its biology and distribution remain limited compared to better-studied congeners such as Bembix americana.