Lepidoptera
- At first glance, the monarch butterfly seems built for beauty, not endurance. Its paper-thin wings look like they could tear in a strong breeze, and its delicate body appears better suited for floating between flowers than crossing continents. Yet these seemingly fragile creatures pull off one of nature's most incredible feats: a 3,000-mile migration. Just like geese, caribou, and senior citizens, they undertake this migration to avoid the harsh winters of the north.
Guides
Euphydryas anicia
Anicia checkerspot, Sacramento Mountains checkerspot
Euphydryas anicia is a checkerspot butterfly (family Nymphalidae) native to the southwestern United States. The species is represented by several subspecies, including E. a. howlandi and E. a. cloudcrofti, the latter being a rare, localized form endemic to the Sacramento Mountains of New Mexico. The subspecies E. a. cloudcrofti has been proposed for listing under the Endangered Species Act due to its extremely restricted range and vulnerability to habitat changes. Checkerspot butterflies in this genus are typically associated with specific host plants and occupy distinct elevational zones.
Euphydryas anicia capella
Euphydryas anicia capella is a subspecies of checkerspot butterfly in the family Nymphalidae, originally described by W. Barnes in 1897. It is currently recognized as a synonym of Occidryas anicia capella in some taxonomic databases, reflecting ongoing taxonomic revision within the Euphydryas complex. The species belongs to a group of fritillary butterflies known for their distinctive orange and black checkered wing patterns and association with specific host plants.
Euphydryas anicia veaziae
Veazie's checkerspot
Euphydryas anicia veaziae is a subspecies of checkerspot butterfly in the family Nymphalidae. It belongs to the Euphydryas anicia species complex, a group of closely related checkerspot butterflies found in western North America. The subspecies is named after Veazie, likely referencing a person or place associated with its discovery or type locality. Like other members of the genus, it is associated with specific host plants for larval development.
Euphydryas chalcedona a paradoxa
Euphydryas chalcedona a paradoxa is a subspecies of the variable checkerspot butterfly, a member of the Nymphalidae family. The species Euphydryas chalcedona occurs in western North America, with subspecies showing geographic variation in appearance and distribution. Like other checkerspots, this taxon is associated with specific host plant relationships and has been subject to conservation concern due to habitat pressures. The subspecies epithet 'a paradoxa' suggests anomalous or unusual characteristics compared to the nominate form.
Euphydryas chalcedona klotsi
Euphydryas chalcedona klotsi is a subspecies of the variable checkerspot butterfly described by dos Passos in 1938. It belongs to the family Nymphalidae and is currently treated as a synonym of Occidryas chalcedona in some taxonomic databases, reflecting ongoing taxonomic revision in the Euphydryas genus complex. The broader species Euphydryas chalcedona is known to exhibit significant population declines in western North America, with climate change identified as a major contributing factor.
Eupithecia affinata
Pug moth
Eupithecia affinata is a small geometrid moth first described by Pearsall in 1908. The species belongs to the genus Eupithecia, commonly known as "pugs," characterized by narrow wings and a distinctive resting posture. It has been documented visiting apple flowers at night, contributing to nocturnal pollination services in agricultural settings. The species is distributed across eastern and southwestern North America.
Eupithecia coconinoensis
Coconino Pug
Eupithecia coconinoensis is a species of inchworm moth in the family Geometridae. As a member of the genus Eupithecia, commonly known as "pugs," it exhibits the narrow wings and distinctive resting posture characteristic of this group. The species has been documented visiting apple flowers at night, contributing to nocturnal pollination services. Observations suggest it occurs in forested habitats in western North America.
Eupithecia huachuca
Eupithecia huachuca is a species of pug moth in the family Geometridae, first described by Grossbeck in 1908. The species is endemic to the southwestern United States, with confirmed records from Arizona and Texas. Its specific epithet references the Huachuca Mountains in southeastern Arizona, one of its documented localities. The species belongs to the large genus Eupithecia, whose members are commonly known as pugs due to their small size and distinctive resting posture with wings held flat and narrow.
Eupithecia misturata
Tamarack Looper
Eupithecia misturata is a small geometrid moth in the genus Eupithecia, commonly known as pugs. First described by George Duryea Hulst in 1896, it is widely distributed across western North America. The species has been documented visiting apple flowers and other flowering plants, contributing to nocturnal pollination services. Two subspecies are recognized: E. m. misturata and E. m. delzurata.
Eupithecia multistrigata
Eupithecia multistrigata is a small moth in the family Geometridae, first described by George Duryea Hulst in 1896. It is widespread across western North America, ranging from the Canadian provinces of Alberta and Saskatchewan south through the western United States to Arizona and New Mexico. The species has a wingspan of approximately 20 mm. Like other members of the genus Eupithecia, commonly known as "pugs," it exhibits the characteristic narrow wings and distinctive resting posture typical of this diverse group of inchworm moths.
Eupithecia mutata
spruce cone looper, cloaked pug
Eupithecia mutata is a small moth in the family Geometridae, first described by Pearsall in 1908. The species is restricted to northeastern North America, where it occurs in coniferous forest habitats. The common name "spruce cone looper" reflects its larval association with spruce cones.
Eupithecia nimbosa
Pug moth
Eupithecia nimbosa is a small geometrid moth described by George Duryea Hulst in 1896. It occurs throughout the Rocky Mountains from Arizona to the Canada–US border. Like other members of its genus, it has narrow wings and a distinctive resting posture. The species has been documented visiting apple flowers at night, contributing to nocturnal pollination of fruit crops.
Eupithecia pertusata
Eupithecia pertusata is a small moth in the family Geometridae, commonly known as pug moths. It is restricted to the southwestern United States, occurring in Texas, Arizona, and New Mexico. The species has a wingspan of approximately 17 mm. Like other Eupithecia species, it is nocturnal and has been documented visiting flowers, contributing to nighttime pollination services.
Eupithecia scabrogata
Pug moth
Eupithecia scabrogata is a small geometrid moth described by Pearsall in 1912. It occurs in western North America from British Columbia south to California and Arizona. Adults are active primarily from November through March, with a possible second generation in May. The species has been documented visiting apple flowers at night, contributing to nocturnal pollination services.
Eupithecia unicolor
Pug Moth
Eupithecia unicolor is a small geometrid moth native to western North America. Adults are active from spring through late autumn, with a wingspan of approximately 21 mm. The species is notable for its narrow wings and characteristic resting posture typical of pug moths. Larvae feed on coniferous trees including juniper, western redcedar, and Alaska cedar.
Eupsilia morrisoni
Morrison's Sallow
Eupsilia morrisoni, commonly known as Morrison's sallow, is a species of cutworm or dart moth in the family Noctuidae. It is found in North America. The species was described by Grote in 1874 and has been assigned the MONA/Hodges number 9936.
Eurois
A genus of noctuid moths established by Jacob Hübner in 1821. The genus includes approximately six recognized species distributed across the Holarctic region. Adults are characterized by distinctive morphological features including naked eyes without eyelashes, well-developed proboscis, and upturned palpi reaching the vertex of the head.
Euros
Euros is a genus of moths in the family Noctuidae, established by Edwards in 1881. The genus belongs to the subfamily Noctuinae, one of the largest and most diverse groups within the owlet moth family. Members of this genus are part of the rich Australian moth fauna, with the type species and related taxa occurring in various habitats across the continent.
Euros proprius
Euros proprius is a small noctuid moth described by Henry Edwards in 1881. It is the most distinctive species within the Euros genus, characterized by its restricted range in the northern Sierra Nevada of California and specific association with riparian habitats in dry forest ecosystems. The species has a documented larval host relationship with Paeonia brownii.
Eurrhyparodes
Eurrhyparodes is a genus of snout moths in the family Crambidae, subfamily Spilomelinae. The genus was established by Snellen in 1880 and contains approximately 12 recognized species distributed across tropical and subtropical regions. Species in this genus are characterized by their relatively broad wings and often exhibit bold patterning. The genus has been subject to taxonomic revision, with at least one species transferred to the genus Gonocausta.
Eusarca lutzi
Eusarca lutzi is a species of geometrid moth in the family Geometridae. It was described by Wright in 1920. The species is known from North America and has been assigned MONA/Hodges number 6932. Very few observations have been documented, with only 5 records in iNaturalist as of the data cutoff.
Eustrotiini
Eustrotiini moths
Eustrotiini is a tribe of moths in the subfamily Boletobiinae, family Erebidae. Members are small to medium-sized noctuoid moths with generally dull coloration. The tribe is primarily distributed in tropical and subtropical regions, with greatest diversity in the Old World tropics. Many species exhibit cryptic forewing patterns that provide camouflage against bark or leaf litter.
Euteliinae
Euteliinae is a subfamily of moths within the family Euteliidae, superfamily Noctuoidea. The group was established by Grote in 1851. Members of this subfamily are part of a relatively small moth family with approximately 400 species worldwide. The subfamily is distinguished from the related Stictopterinae by morphological features of the adult moths.
Eutrepsia
Eutrepsia is a genus of moths in the family Geometridae, subfamily Larentiinae, first described by Herrich-Schäffer in 1855. The genus contains eight described species distributed from Mexico through Central America to Brazil. Most species were described in the 19th century, with one species added in 1984. The genus is placed in the diverse geometrid moth radiation, though detailed biological information remains limited.
Euxoa absona
Euxoa absona is a species of noctuid moth described by Lafontaine in 1987. It belongs to the genus Euxoa, a large group of owlet moths commonly known as darts or cutworms. The species is part of the diverse Noctuidae family, which includes many agricultural pest species. Very little specific information is documented about this particular species.
Euxoa atristrigata
Euxoa atristrigata is a noctuid moth species described by Smith in 1890. It occurs in western North America from British Columbia and Saskatchewan southward to California. As a member of the genus Euxoa, its larvae likely share the cutworm habit of feeding at or below the soil surface on plant stems, though species-specific biology remains poorly documented.
Euxoa brevipennis
Euxoa brevipennis is a noctuid moth described by Smith in 1888. The species has a wingspan of approximately 33 mm. It occurs in western North America, with records from the Canadian provinces of British Columbia, Alberta, and Saskatchewan, and the U.S. states of Utah, Colorado, and California. The specific epithet 'brevipennis' refers to short wings, though detailed morphological descriptions beyond wingspan are not readily available in the literature.
Euxoa brunneigera
Euxoa brunneigera is a noctuid moth species occurring in western North America from British Columbia south to California. Adults have a wingspan of approximately 30 mm and exhibit variable coloration ranging from grey to brown. The species belongs to the genus Euxoa, which includes numerous cutworm species whose larvae are agricultural pests.
Euxoa cinereopallidus
Euxoa cinereopallidus is a moth species in the family Noctuidae, described by Smith in 1903. It is found in western Canada and parts of the western United States. The wingspan is approximately 32 mm. Like other Euxoa species, it is a cutworm moth, with larvae that likely feed on vegetation and may be agricultural pests.
Euxoa conjuncta
Euxoa conjuncta is a species of owlet moth in the family Noctuidae, described by Smith in 1890. It belongs to the genus Euxoa, which includes numerous cutworm species that are agricultural pests. The species is recorded from North America. Like other Euxoa species, it likely has a life cycle involving egg, larval (cutworm), pupal, and adult stages, with larvae that may damage crops by cutting stems at or below the soil surface.
Euxoa costata
Euxoa costata is a noctuid moth species found in the Pacific Northwest of North America. It is particularly abundant in ponderosa pine forests east of the Cascade Mountains. The species has a wingspan of approximately 34 mm. Like other members of the genus Euxoa, it is a nocturnal species attracted to light.
Euxoa cryptica
Euxoa cryptica is a species of owlet moth in the family Noctuidae, described by Hardwick in 1968. It belongs to a genus containing numerous cutworm and dart moth species, many of which are significant agricultural pests. Very little specific information has been published about this particular species.
Euxoa divergens
Divergent Dart
Euxoa divergens, commonly known as the divergent dart, is a noctuid moth native to North America. Adults have a wingspan of 31–35 mm and are active from May through September, with one generation per year. The species occupies a broad geographic range spanning from Newfoundland and Alaska southward to New York, Michigan, and the mountain regions of the western United States.
Euxoa dodi
Euxoa dodi is a species of owlet moth in the family Noctuidae, described by James Halliday McDunnough in 1923. It belongs to a genus containing numerous cutworm and dart moth species, many of which are agricultural pests. The species is poorly documented in scientific literature, with minimal information available regarding its biology, ecology, or economic significance. It appears to be a relatively obscure member of the North American noctuid fauna.
Euxoa flavicollis
Yellow-collared Dart
Euxoa flavicollis, commonly known as the Yellow-collared Dart, is a species of owlet moth in the family Noctuidae. It occurs in North America, with documented presence in the Canadian provinces of Alberta, Manitoba, and Saskatchewan. The species belongs to a genus containing many cutworm moths, though specific life history details for this particular species remain poorly documented.
Euxoa fumalis
Undusted Dart
Euxoa fumalis is a noctuid moth species described by Grote in 1873, commonly known as the Undusted Dart. It belongs to the diverse genus Euxoa, which contains numerous cutworm and dart moth species. The species is present in North America, though specific details regarding its biology, host associations, and economic importance remain poorly documented compared to better-known congeners such as Euxoa auxiliaris (Army Cutworm).
Euxoa guadalupensis
Euxoa guadalupensis is a species of cutworm or dart moth in the family Noctuidae, first described by Lafontaine & Byers in 1982. It belongs to a genus containing numerous agricultural pest species known for their larval "cutworm" behavior. The species is found in North America, though specific details about its biology, host plants, and economic significance remain poorly documented compared to better-known congeners such as Euxoa auxiliaris (army cutworm).
Euxoa hollemani
cutworm moth, dart moth
Euxoa hollemani is a species of cutworm or dart moth in the family Noctuidae. It is found in North America and has been assigned the MONA or Hodges number 10820. Like other Euxoa species, it is likely a nocturnal moth with larvae that feed on vegetation, though specific ecological details for this species are sparse in available sources.
Euxoa intermontana
Euxoa intermontana is a species of owlet moth in the family Noctuidae, described by Lafontaine in 1975. As a member of the genus Euxoa, it belongs to a group commonly known as darts or cutworms. The species name "intermontana" (between mountains) suggests an association with intermountain regions. Like other Euxoa species, the larvae likely exhibit cutworm behavior, feeding on vegetation and potentially curling into a C-shape when disturbed. However, specific ecological details for this particular species remain poorly documented in available sources.
Euxoa maderensis
Euxoa maderensis is a species of owlet moth (family Noctuidae) in the subfamily Noctuinae, described by Lafontaine in 1976. Like other members of the genus Euxoa, it is likely a nocturnal moth with larvae that function as cutworms—surface-feeding caterpillars that cut plant stems at or near soil level. The specific epithet "maderensis" suggests an association with the Madeira region or similar habitat, though detailed life history information for this particular species appears limited in published literature. The genus Euxoa is widely distributed across North America and includes numerous agricultural pest species.
Euxoa manitobana
Brown Prairie Dart
Euxoa manitobana is a species of owlet moth in the family Noctuidae. It was described by James Halliday McDunnough in 1925. The species is known from the Canadian prairie provinces and is commonly referred to as the Brown Prairie Dart. Like other Euxoa species, it likely has a life cycle typical of cutworm moths, with larvae feeding on herbaceous vegetation.
Euxoa mitis
Spineless Dart
Euxoa mitis, commonly known as the Spineless Dart, is a species of owlet moth in the family Noctuidae. It belongs to the large genus Euxoa, which contains numerous cutworm and dart moth species found across North America. As a member of the Noctuidae, it follows the typical life cycle of egg, larva (caterpillar), pupa, and adult moth. The species was described by Smith in 1894 and has been documented in the Canadian provinces of Alberta and Saskatchewan.
Euxoa mojave
Euxoa mojave is a species of owlet moth in the family Noctuidae, described by Lafontaine in 1987. The specific epithet references the Mojave Desert, suggesting an association with arid environments of the southwestern United States. Like other members of the genus Euxoa, this species is likely nocturnal and belongs to a diverse group of cutworm moths.
Euxoa murdocki
Murdock's cutworm
Euxoa murdocki is a species of cutworm moth in the family Noctuidae, first described by Smith in 1890. As a member of the large genus Euxoa, it belongs to a group of moths whose larvae are commonly known as cutworms—soil-dwelling caterpillars that sever plant stems at or below the soil surface. The species is found in North America, with records from Alberta, Canada. Like other Euxoa species, it is likely nocturnal as an adult and possesses the typical dart moth morphology.
Euxoa obeliscoides
obelisk dart, square-spot dart
Euxoa obeliscoides, commonly called the obelisk dart or square-spot dart, is a cutworm moth in the family Noctuidae. The species is found across North America, with records from Canada (Alberta, Manitoba, Saskatchewan) and the United States (Vermont). Like other Euxoa species, the larvae are cutworms that feed on plants, though specific host associations for this species are not well documented. Adults are attracted to light.
Euxoa occidentalis
Euxoa occidentalis is a species of cutworm or dart moth in the family Noctuidae, described by J. Donald Lafontaine and J.R. Byers in 1982. It is found in North America. The species has a MONA or Hodges number of 10781.1. Limited information is available regarding its specific biology and ecology.
Euxoa olivalis
cutworm, dart moth
Euxoa olivalis is a species of cutworm moth in the family Noctuidae, described by Grote in 1879. It belongs to a genus of moths whose larvae are known as cutworms, soil-dwelling caterpillars that feed on plant stems at or below ground level. The species is documented from North America, with specific records from Alberta and Saskatchewan in Canada. As a member of the Euxoa genus, it shares the general life history pattern of overwintering as larvae and completing development in spring, though species-specific details for E. olivalis remain poorly documented in published literature.
Euxoa olivia
cutworm, dart moth
Euxoa olivia is a species of cutworm or dart moth in the family Noctuidae, first described by Morrison in 1876. It is found in North America, with records from the Canadian provinces of Alberta, Manitoba, and Saskatchewan. The species is assigned MONA/Hodges number 10741. As a member of the large genus Euxoa, it belongs to a group of moths whose larvae are commonly known as cutworms due to their habit of cutting through plant stems at the soil surface.
Euxoa pallidimacula
Euxoa pallidimacula is a species of owlet moth in the family Noctuidae, described by J. Donald Lafontaine in 1987. It belongs to the large genus Euxoa, which contains numerous cutworm species. Like other members of this genus, the larvae are likely nocturnal feeders that hide in soil or debris during daylight hours. The species has been documented in North America.
Euxoa pallipennis
cutworm, dart moth
Euxoa pallipennis is a species of cutworm moth in the family Noctuidae. It is found in North America, with records from Alberta and Saskatchewan in Canada. Like other Euxoa species, it is likely a nocturnal moth with larvae that feed on plants.

