Household-pest
Guides
Allacrotelsa spinulata
silverfish
Allacrotelsa spinulata is a North American silverfish species in the family Lepismatidae. It belongs to the order Zygentoma, an ancient lineage of wingless insects. The species is relatively well-documented with over 800 iNaturalist observations. It is distinguished from other silverfish by specific morphological features including prominent spines on the caudal filaments.
Anthrenus flavipes
furniture carpet beetle
Anthrenus flavipes is a small dermestid beetle known as the furniture carpet beetle. Adults are 2–3.5 mm long, black with variable white and yellow mottling, and have rounded or oval body scales that distinguish them from related carpet beetles. The species has a cosmopolitan distribution and is a significant pest of household materials, particularly upholstered furniture, carpets, and textiles. Larvae are responsible for damage, feeding on keratin-containing materials including wool, hair, feathers, and silk.
Anthrenus lepidus
Anthrenus lepidus is a species of carpet beetle in the family Dermestidae. It is a small beetle found in North America, with adults measuring 2-4 mm in length. Like other members of the genus Anthrenus, it is a household pest whose larvae feed on dried animal products including wool, silk, feathers, and keratin-based materials. The species is part of a group of cosmopolitan pests that have spread worldwide through international commerce.
Anthrenus pimpinellae
Anthrenus pimpinellae is a small carpet beetle in the family Dermestidae, native to the Palaearctic region but introduced to North America. Adults measure 3–4 mm and have black elytra with white and brown scales. The species exhibits selective flower-feeding behavior, with mating occurring exclusively on preferred floral hosts. Larvae feed on dried animal products including keratin-containing materials.
Anthrenus verbasci
Varied Carpet Beetle
Anthrenus verbasci is a cosmopolitan pest species in the family Dermestidae, commonly known as the varied carpet beetle. Adults are small (2–4 mm), rounded beetles with distinctive patterned elytra bearing bands or spots of brown, black, and white scales. Larvae are covered in dense setae and feed on dried proteinaceous material, causing damage to household items, museum collections, and stored agricultural products. The species exhibits circannual control of its life cycle, with photoperiod serving as the primary zeitgeber for synchronizing pupation and adult emergence in spring. Adults feed on pollen and nectar, particularly from umbelliferous plants (Apiaceae) and Asteraceae, and use both olfaction and vision in host plant selection.
Attagenus schaefferi
carpet beetle
Attagenus schaefferi is a species of carpet beetle in the family Dermestidae, distributed across North America. It belongs to the subfamily Attageninae and is one of nine Attagenus species recognized north of Mexico. The species was originally described as Megatoma schaeferi by Herbst in 1792. Two subspecies have been recognized: A. s. hypar Beal, 1970 and A. s. spurcus LeConte, 1874. Like other carpet beetles, it is commonly associated with dried animal products and household environments.
Attagenus unicolor
black carpet beetle
Attagenus unicolor, the black carpet beetle, is a 3–5 millimeter beetle in the family Dermestidae. It is considered the most destructive carpet beetle species in the United States. The larval stage causes damage to household fabrics, furniture, and stored products by feeding on natural fibers and dried animal materials. Adults feed on flower pollen. The species has both economic and minor medical significance due to the irritating hairs of larvae, which can cause dermatitis in sensitive individuals.
Blattidae
Household Cockroaches
Blattidae is a family of cockroaches in the order Blattodea, established by Latreille in 1810. The family includes several of the most common household and peri-domestic pest species, notably in the genera *Periplaneta*, *Blatta*, and *Eurycotis*. The family is distributed worldwide, with particular diversity in tropical and subtropical regions. Many species have adapted to human-altered environments, though numerous species remain restricted to natural habitats such as leaf litter and forest floors.
Ceuthophilus stygius
Kentucky cave cricket, cave camel cricket, Stygian Cave Cricket
Ceuthophilus stygius is a camel cricket in the family Rhaphidophoridae, commonly known as the Kentucky cave cricket or Stygian Cave Cricket. It is native to North America, with records from the southeastern United States and Indiana. As a member of the genus Ceuthophilus, it shares traits with other cave crickets including elongated antennae, powerful jumping legs, and adaptation to dark, damp environments. The species has been studied for its metabolic and water economy physiology in relation to body size and temperature.
Dermestes lardarius
larder beetle, moisture bug, bacon beetle
Dermestes lardarius, commonly known as the larder beetle or bacon beetle, is a cosmopolitan pest of stored animal products. Adults measure 7–9 mm and are distinguished by a broad yellowish band with three black dots across dark brown elytra. The species completes its life cycle in 40–50 days under optimal conditions but typically produces one generation per year. Both larvae and adults feed on dried meats, pet food, hides, feathers, cheese, and museum specimens.
Diestrammena asynamora
Greenhouse camel cricket, Asian camel cricket, Greenhouse stone cricket
Diestrammena asynamora, commonly known as the greenhouse camel cricket or Asian camel cricket, is a wingless orthopteran native to China and other parts of Asia. First detected in the United States in a Minnesota greenhouse in 1898, it has become the dominant camel cricket species in human dwellings across eastern North America, now comprising over 90% of camel crickets found in homes in regions like Maryland, Virginia, and Washington D.C. This species thrives in dark, damp, cool environments including basements, crawl spaces, caves, and tool sheds.
Gryllidea
crickets
Gryllidea is an infraorder within the suborder Ensifera comprising crickets and their relatives. The group contains two superfamilies—Grylloidea (true crickets, tree crickets, scaly crickets, and allies) and Gryllotalpoidea (mole crickets and ant crickets)—encompassing more than 6,000 described species globally. Members are characterized by acoustic communication through stridulation, with males producing species-specific songs to attract mates. The infraorder originated in the Triassic period approximately 250–200 million years ago and represents the third most diverse group within Orthoptera.
cricketsOrthopteraEnsiferaacoustic-communicationstridulationmole-cricketsant-cricketsmyrmecophilybioacousticsedible-insectsagricultural-pesthousehold-pestTriassic-originhemimetabolous-developmentkleptoparasitismchemical-mimicryautotomythigmotaxisinvasive-speciesDiestrammena-asynamoraAcheta-domesticusGryllodes-sigillatusGryllus-firmusParagordius-variushost-parasite-interactionsmitochondrial-genomicspositive-selectioncox1Nearctic-faunaYunnan-biodiversityurban-ecologysoil-ecosystem-engineeringdecomposerfood-securityalternative-proteinGryllus pennsylvanicus
Fall Field Cricket
Gryllus pennsylvanicus, commonly known as the fall field cricket, is a widespread North American cricket species distinguished by its autumn breeding season and distinctive chirping. Adults are medium-sized crickets, 15–25 mm in length, with dark black to dark brown coloration and occasionally a slight reddish tint. The species is notable for its temperature-dependent chirping rate, which has been used as a biological thermometer. Males produce calling songs from burrow entrances to attract females, with older males typically preferred by females. The species has an annual life cycle with one generation per year, overwintering as eggs in soil.
Harmonia axyridis
harlequin ladybird, multicolored Asian lady beetle, Asian lady beetle, Halloween beetle
Harmonia axyridis is a highly variable coccinellid beetle native to eastern Asia, introduced to North America and Europe beginning in 1916 for biological control of aphids and scale insects. It became established in the wild in North America around 1988 and has since spread across multiple continents, becoming one of the world's most invasive insects. The species exhibits exceptional color polymorphism, with forms ranging from orange-red with black spots to entirely black with red markings. It is now recognized as a significant threat to native ladybird populations through competition and intraguild predation, while also functioning as a household nuisance pest and occasional agricultural contaminant.
Lepisma
silverfish
Lepisma is a genus of primitive wingless insects in the family Lepismatidae. The most familiar species is Lepisma saccharina, commonly known as the silverfish, which is a cosmopolitan commensal of humans. Members of this genus are characterized by their flattened, torpedo-shaped bodies, long antennae, and three caudal filaments. The genus name has neuter gender per ICZN Opinion 2427 (2018), affecting species epithet endings.
Lepisma saccharinum
Common Silverfish, Silverfish
Lepisma saccharinum, commonly known as the silverfish, is a small, wingless insect in the order Zygentoma. It derives its common name from its silvery coloration and fish-like undulating movements. This species is cosmopolitan in distribution and frequently found in human dwellings, where it feeds on starchy materials.
Lepismatidae
Typical Silverfishes
Lepismatidae is a family of primitive, wingless insects in the order Zygentoma, containing approximately 190-340 described species worldwide. The family includes the two most familiar domestic species: the silverfish (Lepisma saccharina) and the firebrat (Thermobia domestica). These ancient insects represent some of the earliest diverging lineages within Insecta, with origins dating back hundreds of millions of years. Members are characterized by elongated, flattened bodies covered in scales, three caudal filaments, and a complete absence of wings throughout their life cycle.
Liposcelis nigra
booklouse
Liposcelis nigra is a minute species of booklouse in the family Liposcelididae. It belongs to a genus of nearly microscopic insects commonly associated with stored products and household environments. The species was described by Nathan Banks in 1900 and is known from North America.
Ochetellus glaber
black household ant, black house ant, tramp ant, Copper-bellied Ant
Ochetellus glaber is a small ant species native to Australia, widely introduced globally through human commerce. Workers measure 2–3 mm, with queens reaching 5.2–5.5 mm. The species is recognized as a species complex with cryptic diversity, complicating identification and management decisions. It nests arboreally and in structures, forming conspicuous trails to exploit honeydew and food resources. Considered a household pest, it has established populations in Hawaii, Florida, New Zealand, and multiple Asian and Pacific regions.
Oryzaephilus mercator
Merchant Grain Beetle
A small, flattened beetle approximately 2.5–3 mm in length. A cosmopolitan pest of stored food products, particularly processed cereals and oilseeds with high oil content. Distinguished from the nearly identical Oryzaephilus surinamensis by its larger eyes and narrower head behind the eyes. Unlike O. surinamensis, adults are capable of flight.
Paratrechina longicornis
Longhorn Crazy Ant, Black Crazy Ant
Paratrechina longicornis, commonly known as the longhorn crazy ant or black crazy ant, is a small dark-colored ant species in the family Formicidae. It is one of the most widely distributed ant species globally, found in nearly every tropical and subtropical location through human-mediated transport. The species exhibits remarkable adaptability to human-modified environments, thriving in urban centers, greenhouses, and buildings even in temperate climates. Its erratic, non-linear movement patterns earned it the common name 'crazy ant'. The species is considered one of the world's worst invasive ant species due to its ecological and economic impacts.
Sclerodermus macrogaster
Sclerodermus macrogaster is a small parasitic wasp in the family Bethylidae, native to the southeastern United States. The species gained attention in 2018 when it was documented for the first time infesting a home in North America, following a report from Florida where a resident was stung. Adults are typically wingless and easily mistaken for ants. The species parasitizes wood-boring beetles, which occasionally leads to co-infestation of structures where such beetles are present.
Solenopsis molesta
thief ant, grease ant
Solenopsis molesta is a small myrmicine ant known for its habit of nesting near other ant colonies and stealing their food and brood, earning it the common name 'thief ant.' Workers are tiny (0.5–3 mm), yellow to pale brown, with reduced eyes and a two-segmented petiole. The species is native to the United States and northern Mexico, where it occupies diverse habitats from soil and rotting logs to human dwellings. Colonies range from a few hundred to a few thousand workers and may be polygynous. Nuptial flights occur from late July through early fall. The species is attracted to grease and protein sources rather than sweets, making it a distinctive household pest that is difficult to control due to its small size and inaccessible nesting sites.
Tapinoma
Tapinoma is a moderately diverse genus of ants in the subfamily Dolichoderinae, comprising approximately 87 described species (81 extant, 6 fossil) with a crown age estimated at 34–49 million years. Species occur worldwide in tropical and temperate regions, exhibiting generalized foraging behavior and flexible nesting habits. Several species, including T. sessile and T. melanocephalum, are notable as household pests and invasive species associated with human disturbance.
Tapinoma melanocephalum
Ghost ant
Tapinoma melanocephalum, commonly known as the ghost ant, is a minute ant species recognized by its distinctive bicolored appearance: dark brown head and thorax contrasting with pale, translucent legs, antennae, and gaster. Native to tropical regions of Africa and Asia, it has become a globally distributed "tramp" species through human commerce, establishing populations in greenhouses, heated buildings, and tropical urban environments worldwide. The species is considered a significant household pest, particularly in Florida and Hawaii, where it nests indoors and forages for sweet foods. Recent taxonomic revision has revealed that what was long considered T. melanocephalum actually comprises two cryptic species, with T. pithecorum described as new in 2020.
Tapinoma sessile
odorous house ant, sugar ant, stink ant, coconut ant
Tapinoma sessile is a small, highly adaptable ant native to North America that has become one of the most common household pests in the United States. The species exhibits remarkable plasticity in social structure: forest colonies are small, monogynous, and inhabit single nests, while urban colonies achieve massive supercolony status through extreme polygyny (multiple queens) and polydomy (multiple interconnected nests). Workers produce a distinctive odor when crushed, historically described as coconut-like but chemically confirmed to match blue cheese due to shared methyl ketones. The species spreads primarily through budding rather than independent colony founding, and shows high tolerance to many common insecticides, contributing to its persistence as a pest.
Tetramorium bicarinatum
ghost ant, bicarinatum-group fierce ant
Tetramorium bicarinatum is a widely distributed ant species native to Southeast Asia that has become established globally as a common tramp species. It is frequently found in human-modified environments including houses, greenhouses, and landscaped areas. The species forms mutualistic relationships with honeydew-producing insects such as mealybugs, particularly tending the cotton mealybug Phenacoccus solenopsis on agricultural crops. Its venom contains pharmacologically active peptides, including the helix ring peptide Tb11a (bicarinalin), which has attracted research interest for potential biomedical applications.
Thermobia
Thermobia is a genus of primitive insects in the family Lepismatidae, order Zygentoma. The genus name derives from Greek roots meaning 'warmth' and 'life,' reflecting its members' thermophilic nature. The best-known species, Thermobia domestica (firebrat), is a common synanthropic pest of heated indoor environments worldwide. The genus was originally described as Termophila by Grassi in 1887, emended to Thermophila in 1889, and renamed to Thermobia by Bergroth in 1890.
Thermobia domestica
Firebrat
Thermobia domestica, commonly known as the firebrat, is a small hexapod in the order Zygentoma, closely related to silverfish. It is distinguished by its preference for hot environments, particularly steam-heated buildings and boiler rooms. The species exhibits pheromone-mediated aggregation behavior requiring physical contact for recognition. It feeds on carbohydrates, especially starchy materials, and can be a minor pest in libraries and storage facilities.
Tinea pallescentella
Large Pale Clothes Moth
Tinea pallescentella is a small clothes moth in the family Tineidae, commonly known as the large pale clothes moth. Adults have a wingspan of 12–15 mm and are active year-round. The species has a broad distribution spanning most of Europe (excluding the Iberian and most of the Balkan Peninsula), western North America, South America, and Australia. Larvae feed on keratinous animal matter including hair, wool, fur, and feathers.
Willowsia
Willowsia is a genus of slender springtails in the family Entomobryidae, containing approximately six described species. The genus exhibits a pantropical to cosmopolitan distribution, with notable diversity in Asia and multiple species present in the Americas. Some species, particularly W. nigromaculata, are among the most abundant and widely distributed springtails in the northern hemisphere. Phylogenetic studies indicate that Willowsia is polyphyletic, with some species showing closer relationships to other entomobryine taxa. The genus includes both native New World endemics and potentially introduced populations.