Nocturnal
Guides
Litoprosopus coachella
palm flower moth, palm budworm
Litoprosopus coachella, commonly known as the palm flower moth or palm budworm, is a moth species in the family Erebidae. The species is notable for its larval stage, which feeds on palm flowers and buds, particularly of ornamental fan palms. Mature caterpillars abandon host plants to pupate, frequently entering human dwellings where they spin cocoons incorporating carpet fibers and other materials. The species is widely distributed in North America, with substantial populations in urban areas of the southwestern United States where palm landscaping is common. Adult moths are dull-colored and nocturnal.
Lobocleta peralbata
Speckled Wave
Lobocleta peralbata is a small geometrid moth known as the Speckled Wave, with a wingspan of 11–20 mm. It is widespread across the southeastern and southwestern United States. Adults are active nearly year-round, from December through September. The species belongs to the subfamily Sterrhinae, which includes many small wave moths with delicate patterning.
Lomographa
Lomographa is a genus of geometrid moths in the tribe Baptini, erected by Jacob Hübner in 1825. The genus contains multiple species distributed across the Palearctic region, with some extending into North America. The best-studied species is Lomographa bimaculata (White-pinion Spotted), which has served as a model for genomic studies. Adult moths are generally small with white or pale wings and distinctive dark markings.
Loxosceles
Recluse Spiders, Brown Spiders, Fiddle-backs, Violin Spiders, Reapers
Loxosceles is a genus of venomous spiders in the family Sicariidae, comprising approximately 149 species of cryptic, reclusive, nocturnal arachnids. These spiders are characterized by their six eyes arranged in three pairs, a distinctive violin-shaped marking on the cephalothorax in many species, and cytotoxic venom that can cause necrotic lesions in some bite victims. The genus has a primarily neotropical distribution, with significant diversity in Brazil and the southwestern United States, though some species have been introduced to other regions through human activity.
Loxosceles apachea
Apache Recluse
Loxosceles apachea, the Apache recluse, is a species of recluse spider in the family Sicariidae. It is found in the southwestern United States and Mexico. Like other recluse spiders, it possesses cytotoxic venom that can cause necrotic lesions in rare cases, though bites are uncommon and typically occur only when the spider is trapped against skin. The species is poorly studied compared to the more widespread brown recluse (L. reclusa).
Loxosceles deserta
Desert Recluse
Loxosceles deserta, commonly known as the desert recluse, is a venomous brown spider in the family Sicariidae. It is native to the southwestern United States and northwestern Mexico. The species is frequently misidentified as the brown recluse (L. reclusa) or L. unicolor, despite occupying a geographically distinct range. Its venom contains cytotoxic compounds that can cause necrotic skin lesions in humans, though bites are rare and typically defensive.
Loxosceles devia
Texas Recluse
Loxosceles devia, commonly known as the Texas recluse, is a species of recluse spider in the family Sicariidae. It is native to the southern United States and Mexico. Like other members of the genus Loxosceles, it possesses venom that can cause necrotic skin lesions in humans, though bites are rare and typically occur only when the spider is trapped against skin. The species is closely related to other recluse spiders and shares their characteristic shy, reclusive behavior.
Loxosceles rufescens
Mediterranean recluse spider, violin spider, brown spider
Loxosceles rufescens is a globally invasive recluse spider native to the Mediterranean region. It has established populations across six continents through human-mediated dispersal, often in synanthropic environments. The species is medically significant due to cytotoxic venom containing phospholipases D that can cause loxoscelism—characterized by dermonecrosis, hemolysis, and potential systemic complications. Despite its fearsome reputation, bites are defensive and relatively uncommon even where populations are established.
Macalla glastianalis
Macalla glastianalis is a species of pyralid moth in the subfamily Epipaschiinae, described by Schaus in 1922. It belongs to the genus Macalla, a group of moths whose larvae are known to feed on poison ivy (Toxicodendron radicans). The species has been recorded in the United States with 87 observations documented on iNaturalist. Like other members of its genus, it is presumably nocturnal and attracted to light.
Macaria occiduaria
The Barred Gray
Macaria occiduaria is a geometrid moth in the tribe Macariini, commonly known as the Barred Gray. The species is characterized by gray forewings with distinct dark transverse lines and a relatively broad wingspan for its genus. It is native to western North America and has been documented in a moderate number of observations. Adults are active during summer months.
Macaria pustularia
Lesser Maple Spanworm Moth
Macaria pustularia, commonly known as the Lesser Maple Spanworm Moth, is a geometrid moth species distributed across eastern and central North America. The species is well-documented with over 20,000 observations, indicating it is relatively common and conspicuous. Adults are nocturnal and attracted to light. The common name references its association with maple host plants and the 'spanworm' habit of its larvae, which move with a looping gait characteristic of geometrid caterpillars.
Macaria signaria
dusky peacock, pale-marked angle, spruce-fir looper, Northern Conifer Angles
Macaria signaria is a small geometrid moth with a wingspan of 20–28 mm. Two subspecies are recognized: M. s. signaria across Eurasia and M. s. dispuncta in North America. The species is associated with coniferous forests and has been documented feeding on spruce and larch as larvae.
Machilinae
Machilinae is a subfamily of bristletails within the family Machilidae, comprising one of the two major lineages of the jumping bristletail family. Members are small, wingless insects with the characteristic arched thorax and springing organ (furcula) that enables their distinctive jumping locomotion. The subfamily has been historically distinguished from the other machilid subfamily, Petrobiinae, primarily by subtle differences in abdominal appendage structure and scale patterns. Machilinae species are found across temperate and Mediterranean regions, often occupying rocky, coastal, or urban habitats.
Macrobaenetes algodonensis
Algodones Sand Treader Cricket
Macrobaenetes algodonensis, the Algodones Sand Treader Cricket, is a species of camel cricket described by Tinkham in 1962. It belongs to the family Rhaphidophoridae, a group of wingless, hump-backed crickets commonly known as camel or cave crickets. The species is endemic to the Algodones Dunes region of southeastern California, where it inhabits sandy desert environments. As a member of the genus Macrobaenetes, it shares adaptations for life in loose sand with related sand treader crickets.
Macrocentrinae
Macrocentrinae is a subfamily of braconid parasitic wasps comprising eight recognized genera. Members are relatively large braconids characterized by small teeth on the trochantellus and often exhibit pale coloration and nocturnal habits. They are solitary or gregarious koinobiont endoparasitoids of caterpillars, with documented associations primarily with pyralid moth larvae. Several species have been deployed in biological control programs against agricultural pests.
Macrochilo litophora
Brown-lined Owlet, Angulate Fan-foot, Brown-lined Owlet Moth
Macrochilo litophora is a small litter moth in the subfamily Herminiinae, first described by Augustus Radcliffe Grote in 1873. It occurs across the eastern and central United States. The species exhibits regional variation in voltinism, with one generation annually in northern populations and two generations in parts of the Midwest. Larvae are detritivores, feeding on dead plant material.
Macrochilo louisiana
Louisiana Owlet, Louisiana Macrochilo, Louisiana Snout-moth
Macrochilo louisiana is a small litter moth in the family Erebidae, first described by William Trowbridge Merrifield Forbes in 1922. It is widely distributed across North America, ranging from Quebec and Maine south to Florida, west to Texas, and north to Alberta. Adults are active from June to September in northern populations and from February onward in southern populations. The species has a wingspan of 20–27 mm.
Maladera formosae
Asiatic garden beetle
Maladera formosae, the Asiatic garden beetle, is an invasive scarab beetle native to East Asia that was introduced to North America in 1921. It has become a significant agricultural pest, particularly in the Great Lakes region where it damages field corn, soybeans, and commercial mint. The species exhibits a univoltine life cycle with soil-dwelling larvae that feed on plant roots and nocturnal adults that consume foliage and flowers. Both life stages cause economically important damage, with larvae responsible for early-season crop losses and adults defoliating ornamental and crop plants.
Manduca florestan
Florestan sphinx
Manduca florestan, commonly known as the Florestan sphinx, is a large hawkmoth in the family Sphingidae. Adults are notable for their robust build and are attracted to mercury-vapor and ultraviolet light sources in oak-juniper woodland habitats. The species exhibits considerable geographic variation in flight period timing, with year-round activity in tropical regions and more restricted seasonal emergence in temperate areas.
Manduca muscosa
Muscosa Sphinx
Manduca muscosa, the muscosa sphinx, is a large sphinx moth in the family Sphingidae. Adults have a wingspan of 100–126 mm and exhibit darker, olive-toned coloration compared to related species. The species occurs from southern Arizona through Central America, with larvae feeding on multiple host plants including Verbesina gigantea and members of the Asteraceae family.
Manduca quinquemaculatus
Five-spotted Hawk Moth, Tomato Hornworm
Manduca quinquemaculatus, commonly known as the five-spotted hawk moth or tomato hornworm, is a large sphinx moth whose caterpillar is a significant agricultural pest. The adult moth has a wingspan up to 5 inches (12 cm) and is a strong flier active at night. The larval stage feeds primarily on tomatoes and other Solanaceae plants, causing extensive defoliation when populations are high. The species is closely related to and often confused with the tobacco hornworm (Manduca sexta).
Manduca rustica
Rustic Sphinx
Manduca rustica, the rustic sphinx, is a large hawkmoth (Sphingidae) first described by Johan Christian Fabricius in 1775. The species is notable for its broad geographic distribution across the Americas, ranging from the southern United States through Central and South America to Uruguay. It exhibits considerable ecological flexibility, inhabiting diverse environments from rainforests to deserts, and has been documented using host plants from at least five plant families. Adults are nocturnal and attracted to light sources.
Mantispidae
mantidflies, mantispids, mantid lacewings, mantis-flies
Mantispidae is a family of neuropteran insects comprising approximately 400 species in around 400 genera, distributed worldwide with highest diversity in tropical and subtropical regions. Adults are predators characterized by raptorial forelegs—convergent with mantises but independently evolved—used to capture small arthropod prey. The family exhibits diverse larval life histories: Mantispinae are ectoparasitoids of spider egg sacs; Symphrasinae parasitize ground-nesting hymenopterans and scarab beetle larvae; Calomantispinae are predatory on small arthropods; and Drepanicinae life history remains largely unknown. First-instar larvae (planidia) employ specialized host-location strategies including direct penetration of egg sacs or phoretic transport on female spiders.
Mantoididae
Mantoididae is a small, early-diverging family of praying mantises (Mantodea) comprising three extant genera and approximately 14 species. The family is consistently recovered as sister to all other mantises except Chaeteessidae. Members exhibit specialized hymenopteran mimicry, with some species displaying transformational mimicry during development. The family is restricted to the Neotropics.
Marathyssa
Beautiful Marathyssa Moth (for M. pulcherrimus)
Marathyssa is a genus of moths in the family Euteliidae, established by Francis Walker in 1865. The genus contains approximately 20 described species distributed across the Americas, Africa, and Asia. Several species occur in North America, including the type species M. basalis. The genus has been subject to taxonomic revision, with some sources historically placing it in Noctuidae.
Martyringa latipennis
Square-spotted Martyringa Moth
Martyringa latipennis is a small moth in the family Lecithoceridae, commonly known as the Square-spotted Martyringa Moth. It is found across the eastern and central United States, with adults active from late spring through mid-summer. The species is recognized by its distinctive wing pattern featuring pale ochreous forewings with brownish-fuscous clouding and a characteristic pale fascia.
Mastigoproctus
whip scorpion, vinegaroon
Mastigoproctus is a genus of large whip scorpions (vinegaroons) in the family Thelyphonidae. These arachnids are characterized by their elongated antenniform front legs, robust pedipalps, and ability to spray defensive acetic acid. The genus includes approximately 25 accepted species distributed across the Americas, from the southwestern United States through Mexico, Central America, the Caribbean, and into northern South America. Despite their intimidating appearance, they are not venomous and lack venom glands entirely.
Mastigoproctus cinteotl
Mastigoproctus cinteotl is a species of vinegaroon (whip scorpion) in the family Thelyphonidae, described in 2018. It belongs to a genus of large, primarily nocturnal arachnids found in the Americas. Like other vinegaroons, it possesses a pair of elongated, whip-like front legs used as sensory appendages, and can discharge a defensive spray of acetic acid from glands at the base of the tail. The species is part of a group often kept in captivity for educational purposes due to their docile nature and distinctive appearance.
Mastigoproctus floridanus
Florida vinegaroon
Mastigoproctus floridanus, commonly known as the Florida vinegaroon, is a species of whip scorpion (order Uropygi) in the family Thelyphonidae. It is native to Florida and represents one of several vinegaroon species found in North America. Like other vinegaroons, it possesses a pair of large pedipalps modified into pincers and a long, whip-like flagellum used for sensory detection. The species is primarily nocturnal and, when disturbed, can spray a defensive secretion containing acetic acid from glands at the base of the flagellum, producing a vinegar-like odor.
Mastigoproctus giganteus
giant whip scorpion, giant vinegaroon, grampus, Texas giant vinegaroon
Mastigoproctus giganteus is a large arachnid in the order Uropygi, commonly known as the giant whip scorpion or vinegaroon. It is the only member of family Thelyphonidae found in the United States, occurring from the southern U.S. through Mexico. The species is nocturnal and occupies humid microhabitats in arid and semi-arid environments. It is notable for its ability to spray a defensive secretion containing 85% acetic acid, which produces a strong vinegar-like odor. The species is long-lived, with females producing a single brood of approximately 40 offspring that receive extended maternal care.
Mastigoproctus tohono
Tohono whipscorpion, Tohono vinegaroon
Mastigoproctus tohono is a species of whip scorpion (order Uropygi) described in 2018 from populations previously attributed to Mastigoproctus giganteus. It is distinguished by specific setal patterns and epistoma positioning. The species produces acetic acid spray as a chemical defense, creating a vinegar-like odor. It inhabits arid regions of the southwestern United States and northern Mexico.
Mastinocerini
Mastinocerini is a tribe of glow-worm beetles within the family Phengodidae, comprising at least 190 described species across 24 genera. Members of this tribe are distributed primarily in the New World, with significant diversity in Central and South America. The tribe was established by LeConte in 1881 and includes the type genus Mastinocerus. These beetles are notable for their bioluminescent larvae, which use light production to lure prey.
Mastophora hutchinsoni
American bolas spider, Cornfield Bolas Spider
Mastophora hutchinsoni is a bolas spider in the orb-weaver family Araneidae, notable for its highly specialized hunting strategy that abandons the typical orb web in favor of a single adhesive droplet on a silk thread. Adult females use aggressive chemical mimicry to attract male moths by releasing species-specific sex pheromone blends, then capture prey by swinging this 'bolas' at hovering moths. The species exhibits extreme sexual dimorphism, with females developing into large, globular spiders while males remain small and retain juvenile hunting behaviors. It occurs throughout eastern North America and has been extensively studied in Kentucky populations.
Mastophora leucabulba
Mastophora leucabulba is a bolas spider in the orb-weaver family Araneidae. Adult females hunt using a single sticky silk droplet suspended from a dragline rather than building an orb web. Males and juvenile females lack this specialized hunting method and capture prey directly with their legs. The species occurs from the United States to Honduras.
Mastophora phrynosoma
Toadlike Bolas Spider
Mastophora phrynosoma is a bolas spider in the orb-weaver family Araneidae. Adult females hunt without building a web, instead using a single silk line with one or more sticky droplets to capture prey. Males and juvenile females lack this specialized hunting method and capture prey directly with their legs. The species is found in the United States.
Meconema meridionale
Southern Oak Bush-cricket
Meconema meridionale is a small bush-cricket in the family Tettigoniidae, native to southern Europe and expanding northward. It measures 14–17 mm in body length (excluding antennae). The species is carnivorous, arboreal, and nocturnal. It has been documented as a predator of the invasive horse-chestnut leaf miner (Cameraria ohridella). Since 2001, it has established populations in the United Kingdom, representing a northward range expansion linked to climate change.
Megacheuma brevipenne
Megacheuma brevipenne is a longhorn beetle in the family Cerambycidae, subfamily Cerambycinae. The species was formerly treated as a subspecies of Tragidion armatum (as Tragidion armatum brevipenne) but has been elevated to full species rank as Megacheuma brevipenne. It is characterized by antennae significantly shorter than the abdomen, distinguishing it from related species. The beetle exhibits Batesian mimicry of tarantula hawk wasps (Pepsis and Hemipepsis).
Megalodacne
pleasing fungus beetles
Megalodacne is a genus of large fungivorous beetles in the family Erotylidae, distinguished by their size (9–22 mm), large eyes, and distinctive color patterns of yellow, orange, or red markings on the elytra. Adults and larvae feed on hard bracket fungi, particularly Ganoderma and Fomes species. The genus was established by George Robert Crotch in 1873 and is classified in the subfamily Megalodacninae alongside Episcapha and Episcaphula. Species occur across North America, Asia, Africa, and Southeast Asia, with some exhibiting nocturnal behavior and attraction to light.
Megalodacne heros
pleasing fungus beetle
Megalodacne heros is a species of pleasing fungus beetle in the family Erotylidae, found in North America. The species exhibits nocturnal activity patterns and is associated with fungal habitats. Commonly known as the pleasing fungus beetle, it is one of the more frequently observed members of its genus, with over 3,700 observations recorded on iNaturalist.
Megalographa
Megalographa is a genus of moths in the family Noctuidae (owlet moths). The genus is primarily known from the Americas, with most species distributed in North and Central America. Species in this genus are generally medium-sized nocturnal moths. The genus name refers to the large size of the wing markings relative to body size.
Megalopyge
flannel moths, puss moths
Megalopyge is a genus of moths in the family Megalopygidae, commonly known as flannel moths or puss moths. The genus contains approximately 50 described species distributed primarily in the Americas. Larvae are densely covered in hair-like setae that conceal venomous spines, making them medically significant due to severe stinging reactions in humans. Adults are relatively small, stout-bodied moths with reduced mouthparts.
Megasoma punctulatum
Arizona elephant beetle
Megasoma punctulatum, commonly known as the Arizona elephant beetle, is a species of rhinoceros beetle in the family Scarabaeidae. It is a member of the genus Megasoma, which includes some of the largest and heaviest beetles in the Americas. Like other members of its genus, this species exhibits strong sexual dimorphism, with males bearing prominent horns on the head and pronotum that are used in combat with other males. The species is found in the southwestern United States and northwestern Mexico.
Megasoma vogti
Texas elephant beetle, Texas megasoma
Megasoma vogti is a large rhinoceros beetle in the family Scarabaeidae, commonly known as the Texas elephant beetle. It belongs to a genus renowned for containing some of the heaviest-bodied beetles in the world. The species is native to southern Texas and northeastern Mexico, where adults are attracted to lights at night. Like other members of the genus, males possess prominent horns used in combat with rival males.
Melanolestes picipes
Black Corsair, Black May Beetle-Eater
Melanolestes picipes, commonly called the Black Corsair, is a predatory assassin bug in the family Reduviidae. The species exhibits pronounced sexual dimorphism: males are fully winged and strong fliers, while females typically have reduced or absent hind wings and merely pad-like forewings. Adults measure 15–20 mm in body length. Northern populations are uniformly jet black; southern specimens may display red or orange abdominal margins or entirely red abdomens. The species is among the most abundant assassin bugs in the United States and is frequently attracted to outdoor lights at night.
Melasini
Melasini is a tribe of false click beetles within the family Eucnemidae, established by Fleming in 1821. Members of this tribe are classified under the subfamily Melasinae, a group characterized by their inability to produce the clicking sound typical of true click beetles (Elateridae). The tribe encompasses multiple genera of small to medium-sized beetles found primarily in forested habitats.
Melipotini
Graphic Owlets
Melipotini is a tribe of moths within the family Erebidae, commonly known as Graphic Owlets. The tribe contains multiple genera of nocturnal moths. Members are characterized by their distinctive wing patterns and coloration. The tribe has been documented extensively on iNaturalist with over 77,000 observations.
Melipotis
Melipotis is a genus of moths in the family Erebidae, first described by Jacob Hübner in 1818. The genus contains approximately 50 recognized species distributed primarily in the Americas. Adults are nocturnal and have been observed visiting flowers, including dandelions. The genus is characterized by distinctive morphological features including modified palps and leg structures.
Melipotis acontioides
Royal Poinciana Moth
Melipotis acontioides, commonly known as the Royal Poinciana Moth, is a nocturnal moth in the family Erebidae. The species was first described by Achille Guenée in 1852. It has a broad distribution spanning the southern United States, Mexico, Central and South America, and the Caribbean, with a distinct subspecies endemic to the Galápagos Islands. The larvae are specialized feeders on certain leguminous trees.
Melipotis fasciolaris
Fasciolated Melipotis, Bewitching Melipotis, Fasciolated Graphic
Melipotis fasciolaris is a moth in the family Erebidae with a wingspan of 33–43 mm. Adults are known to visit flowers and have been observed as pollinators of fetterbush lyonia. The larvae feed exclusively on leaves of Prosopis species. The species occurs across a broad geographic range from the southeastern United States through Central America and the Caribbean to South America.
Melipotis nigrobasis
Melipotis nigrobasis is a species of moth in the family Erebidae, described by Guenée in 1852. It is distributed across North America. The species is assigned MONA/Hodges number 8602. Like other members of the genus Melipotis, it belongs to the subfamily Erebinae, a diverse group of nocturnal moths.