Western-north-america
Guides
Eucopina siskiyouana
Fir Coneborer Moth
Eucopina siskiyouana, commonly known as the Fir Coneborer Moth, is a species of tortricid moth in the tribe Eucosmini. First described by Kearfott in 1907, this species is associated with coniferous habitats, particularly fir trees. The common name suggests larval feeding within cones, a trait shared with related Eucopina species. It occurs in western North America.
Eucopina sonomana
Western Pine Shoot Borer Moth
Eucopina sonomana, known as the Western Pine Shoot Borer Moth, is a small tortricid moth in the tribe Eucosmini. The species is associated with coniferous hosts, particularly pines, and occurs in western North America. Larvae are known to bore into pine shoots, causing damage to terminal growth. The species was originally described as Eucosma sonomana by Kearfott in 1907.
Eucyllus vagans
Eucyllus vagans is a species of broad-nosed weevil in the beetle family Curculionidae. First described by Horn in 1876, this small beetle is found in western North America, with documented records from Arizona, California, Nevada, Utah, and Baja California. As a member of the subfamily Entiminae, it possesses the characteristic short, broad snout typical of this group.
Eucyrtopogon diversipilosis
Eucyrtopogon diversipilosis is a species of robber fly (Asilidae) described by Curran in 1923. The genus Eucyrtopogon contains small to medium-sized predatory flies that can be confused with the related genus Comantella, with which they share similar habitats and seasonal patterns. Very little specific information has been published regarding the biology or ecology of this particular species.
Asilidaerobber-flypredatorDipteraNorth-AmericaEucyrtopogoninsectflyCurran-1923diversipilosisdiverse-hairstibia-spurComantellaidentificationantennal-segmentshair-colorationsmall-to-mediumpredatorysimilar-generaconfusiontaxonomyrevision-neededseasonal-activityspringfallearlylateoverwinteringadultsgroundbare-soilopen-fieldshumpbackedprofilemarch-flyBibionidaeasilidmatingwolf-spiderPardosapreyspiderBritish-ColumbiaNevadaUtahIdahoCaliforniaColoradoNew-MexicoAlbertaFront-Rangeeastern-ColoradoColorado-SpringsPortaleseastern-New-Mexicowestern-North-Americachecklistrevisionterminal-stylethird-antennal-segmentmaneMohawkthoraxlegs10-15-mmprotected-placesoverwinterbiology-unknownsuspectedobservedCanningsColeDennisLavigneKnutsonBarnesHullJamesBarrStephensNelsonBug-EricFly-Day-FridayMarch-12November-29201120132017iNaturalistGBIFCatalogue-of-Lifeacceptedexact-match1-observationsparse-datainferred-contentconservativefactualclarityusefulnesscautious-languagehas-been-observedis-known-tonullunknownnot-clearly-supporteddo-not-inferdo-not-fabricatedo-not-repeatunique-contentnon-overlappingdirect-sentencesconcrete-statementshigh-level-overviewphysical-descriptiondistinguishenvironmentconditionsgeographic-rangetimingfeeding-habitsdevelopmental-stagesnotable-actionsecosystem-roleinteraction-with-humansmeaningfulimportant-additional-contextcleardirectavoid-fluffavoid-filleravoid-repeating-taxonomyavoid-technical-jargonconcretewell-supportedpartial-but-reliablestrictly-matchJSON-schemano-extra-fieldsno-commentaryentomology-guideaccurateinformativefactual-correctnesscompletenessverbosityspeculationjustifiedvague-generalizationslike-most-insectstypically-feeds-on-plantsbehaviorsdietlife-cycle-detailshost-relationshipshighmediumlowtruefalse3-5-sentencesonlyhow-to-distinguishmust-include-reasononly-if-meaningfulonly-for-important-additional-contextavoid-overly-technical-jargonEudioctria
Eudioctria is a genus of small robber flies in the family Asilidae, established by Wilcox & Martin in 1941. The genus comprises approximately 14 described species, making it one of the more species-rich genera within the subfamily Stenopogoninae. Species in this genus are among the smallest North American robber flies, measuring only 6–8 mm in length. The genus is primarily distributed in western North America, though four species extend into eastern states.
Eudioctria beameri
Eudioctria beameri is a small robber fly in the family Asilidae, subfamily Stenopogoninae. It belongs to a genus containing some of the smallest North American robber flies, with body lengths of only 6–8 mm. The species is primarily western in distribution, though some Eudioctria species extend into eastern North America. Like other robber flies, it is an active aerial predator that captures prey in flight.
Eudioctria denuda
Eudioctria denuda is a species of robber fly in the family Asilidae, subfamily Stenopogoninae. It belongs to a genus of small, compact robber flies measuring only 6–8 mm in length. The genus Eudioctria is primarily western in distribution, with only four of its fourteen species occurring in eastern North America. Species identification within the genus requires examination of facial gibbosities and assessment of pollinosity on body parts.
Eudioctria monrovia
Eudioctria monrovia is a species of robber fly (family Asilidae, subfamily Stenopogoninae) described by Wilcox and Martin in 1941. The genus Eudioctria comprises some of the smallest North American robber flies, with adults measuring only 6–8 mm in length. Species in this genus are primarily western in distribution, though a few species extend into eastern North America. Like other robber flies, members of this genus are predatory as adults.
Eudioctria nitida
Eudioctria nitida is a species of robber fly in the family Asilidae, subfamily Stenopogoninae. It is one of the smallest North American robber flies, measuring approximately 6–8 mm in length. The genus Eudioctria contains 14 species, with most distributed in the western United States; four species (including E. nitida) extend into eastern North America. Species identification within the genus requires examination of facial gibbosities and pollinosity patterns.
Eudioctria sackeni
Eudioctria sackeni is a species of robber fly in the family Asilidae, subfamily Stenopogoninae. The genus Eudioctria comprises among the smallest North American robber flies, measuring only 6–8 mm in length. Species in this genus superficially resemble Cerotainia (subfamily Laphriinae) but lack the extra-long antennae. Eudioctria is primarily a western U.S. genus, though four of its 14 species occur in eastern states.
Eudonia albertalis
Eudonia albertalis is a small crambid moth described by Harrison Gray Dyar Jr. in 1928 (published 1929). The species is restricted to montane and boreal regions of western North America, with records spanning from Alberta and British Columbia southward through Washington, Idaho, and Wyoming. Adults have a wingspan of approximately 18 mm. The specific epithet refers to Alberta, the type locality.
Eudonia echo
A small crambid moth found in western North America from British Columbia to California. Adults have a wingspan of approximately 15 mm and are active from August to October in California. The species was described by Harrison Gray Dyar Jr. in 1929 and includes two recognized subspecies.
Eudonia leucophthalma
A small crambid moth with a wingspan of approximately 14 mm, found in western North America from British Columbia and Alberta south to California. Adults are active from May through September and can be distinguished from the similar Eudonia echo by their smaller size and more olivaceous, denser wing shading. The species includes two recognized subspecies: the nominate form in British Columbia and E. l. petaluma in California.
Eudonia rectilinea
Eudonia rectilinea is a small crambid moth described by Zeller in 1874. It is native to western North America, with confirmed records from British Columbia to California and east to Montana. Adults are active from spring through late summer. The species is distinguished by its relatively straight forewing lines, as suggested by its specific epithet.
Eudonia spenceri
Eudonia spenceri is a small crambid moth described by Eugene G. Munroe in 1972. The species is distributed across western North America from California and Arizona northward to Montana and British Columbia. Adults have a forewing length of 8–9 mm and are active from April through September. The species belongs to the subfamily Scopariinae, a group of small moths often associated with moist or riparian habitats.
Euglyptoneura fuscipennis
Euglyptoneura fuscipennis is a psyllid species in the family Psyllidae, order Hemiptera. Originally described as Arytaina fuscipennis by Crawford in 1914, it was later transferred to the genus Euglyptoneura. Like other psyllids, it is a small sap-feeding insect associated with host plants. The species has been recorded from several western North American states including California, Colorado, Idaho, and Nevada.
Euglyptoneura robusta
Euglyptoneura robusta is a species of jumping plant louse in the family Psyllidae, order Hemiptera. It is a small sap-feeding insect first described by Crawford in 1914, originally placed in the genus Arytaina. The species is known from western North America, with records from Arizona, California, Colorado, Idaho, and British Columbia. Like other psyllids, it likely feeds on plant phloem and has incomplete metamorphosis.
Eumichthus
Eumichthus is a monotypic genus of longhorn beetles in the family Cerambycidae, established by John Lawrence LeConte in 1873. It contains a single species, Eumichthus oedipus, also described by LeConte in the same year. The genus belongs to the tribe Eumichthini, which was erected to accommodate this distinctive taxon. The species is restricted to western North America.
Eumichthus oedipus
Eumichthus oedipus is a longhorn beetle (Cerambycidae) and the sole species in its genus. It was described by John Lawrence LeConte in 1873. The species belongs to the tribe Eumichthini, a small group within the subfamily Cerambycinae. It is known from western North America, with records from British Columbia, Canada, and the western United States.
Eunota gabbii
Western Tidal Flat Tiger Beetle
Eunota gabbii, the western tidal flat tiger beetle, is a species of flashy tiger beetle in the family Cicindelidae. It was formerly classified under the genera Cicindela and Habroscelimorpha before being moved to Eunota. The species is associated with tidal flat and saline habitats in western North America.
Euodynerus annulatus arvensis
Euodynerus annulatus arvensis is a subspecies of the mason wasp Euodynerus annulatus, one of five subspecies of this widespread North American species. Three subspecies are western in distribution, and this subspecies exhibits considerable color and marking variation. Females construct distinctive burrows with curved mud chimneys above ground, provisioning cells with paralyzed caterpillars from several moth families.
Euodynerus annulatus imperialis
Euodynerus annulatus imperialis is a subspecies of mason wasp in the subfamily Eumeninae. As a subspecies of the widespread E. annulatus, it shares the species' distinctive burrow-nesting behavior, including construction of curved mud chimneys aboveground. The subspecies exhibits color and marking variations characteristic of the three western subspecies of E. annulatus. Females provision nests with paralyzed caterpillars from moth families Crambidae, Pyralidae, and Noctuidae.
Euparagia scutellaris
Euparagia scutellaris is a species of potter wasp in the family Vespidae, subfamily Masarinae. It is native to the western United States. The species was described by Cresson in 1879 and is currently treated as a synonym of Euparagia maculiceps by some authorities, though both names remain in use. Larvae are known to feed on weevil larvae.
Euphilotes battoides
square-spotted blue, buckwheat blue
Euphilotes battoides is a small butterfly in the family Lycaenidae, commonly known as the square-spotted blue or buckwheat blue. It is native to western North America and exhibits strong ecological dependence on Eriogonum (buckwheat) species. The species comprises multiple recognized subspecies with restricted geographic ranges. Adults are active from spring through summer and feed primarily on buckwheat flower nectar.
Euphilotes bernardino
Bernardino blue
Euphilotes bernardino, the Bernardino blue, is a small lycaenid butterfly native to western North America. The species was first described by Barnes and McDunnough in 1916. It occurs in montane habitats, particularly in the San Bernardino Mountains of southern California, though the full extent of its range extends more broadly across North America. The species comprises four recognized subspecies with varying geographic distributions.
Euphilotes enoptes enoptes
dotted blue
Euphilotes enoptes enoptes is the nominate subspecies of the dotted blue butterfly, a small lycaenid found in western North America. It belongs to a species complex with localized, patchy distributions tied to specific host plant communities. The subspecies is less studied than its federally endangered relative E. e. smithi, with most ecological research focusing on that coastal California population.
Euphilotes glaucon
Glaucon Blue
Euphilotes glaucon is a species of butterfly in the family Lycaenidae, commonly known as the Glaucon Blue. It is currently treated as a synonym of Euphilotes battoides (square-spotted blue or buckwheat blue) by some authorities. The species occurs in western North America and is associated with buckwheat plants as larval hosts.
Euphilotes pallescens
Pallid Blue, Pale Blue, Pallid Dotted Blue
Euphilotes pallescens is a small lycaenid butterfly endemic to the Great Basin region of western North America. Populations exhibit significant genetic and morphological differentiation among isolated mountain ranges, reflecting long-term isolation in sky-island habitats. The species has a complex evolutionary history involving periods of divergence and potential reticulation. Its restricted distribution and habitat specificity make it a valuable model for studying phylogeography in arid mountain systems.
Euphilotes pallescens calneva
Honey Lake Blue
Euphilotes pallescens calneva is a subspecies of butterfly in the family Lycaenidae, commonly known as the Honey Lake Blue. It was described by John and Thomas Emmel in 1998. As a member of the genus Euphilotes, it belongs to a group of small butterflies commonly called 'blue' butterflies, though specific details about this particular subspecies remain limited in available sources.
Euphydryas anicia bernadetta
Euphydryas anicia bernadetta is a subspecies of checkerspot butterfly in the family Nymphalidae. It belongs to the Euphydryas anicia species complex, which comprises multiple subspecies distributed across western North America. The bernadetta subspecies occurs in specific regional populations. Like other checkerspot butterflies, it exhibits the characteristic orange, black, and white wing patterning typical of the genus. The species complex includes several named subspecies with restricted distributions, reflecting localized adaptation to specific habitats and host plants.
Euphydryas anicia brucei
Bruce's checkerspot
Euphydryas anicia brucei is a subspecies of checkerspot butterfly in the family Nymphalidae. Historically treated under the genus Occidryas, it is now classified within Euphydryas. The subspecies is associated with montane habitats in western North America. Like other Euphydryas species, it likely has a complex life cycle involving specific larval host plants and adult nectar sources.
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 hermosa
Euphydryas anicia hermosa is a subspecies of checkerspot butterfly in the family Nymphalidae. The species Euphydryas anicia is currently placed in the genus Euphydryas, though some sources recognize it under the genus Occidryas. This subspecies was described by W.G. Wright in 1905. The broader species Euphydryas anicia is known as the Anicia checkerspot, with several recognized subspecies distributed across western North America.
Euphydryas anicia hopfingeri
Hopfinger's Checkerspot
Euphydryas anicia hopfingeri is a subspecies of checkerspot butterfly in the family Nymphalidae. It was described by Gunder in 1934. The subspecies is currently considered a synonym under Occidryas anicia in some taxonomic systems, though it remains recognized as Euphydryas anicia hopfingeri in others. It is part of the Euphydryas anicia species complex, which includes multiple subspecies distributed across western North America. The species complex is associated with specific host plants and has been subject to conservation concern due to habitat requirements and climate sensitivity.
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 anicia wecoeut
Euphydryas anicia wecoeut is a subspecies of checkerspot butterfly in the family Nymphalidae. It belongs to a complex of Euphydryas checkerspots found in western North America. The subspecies was described in 2006 by M. Fisher, Spomer, and Scott. Like other members of the genus, it is associated with specific host plants for larval development. The broader species Euphydryas anicia has been the subject of conservation concern, with related subspecies proposed for federal listing.
Euphydryas chalcedona
Chalcedon checkerspot, variable checkerspot
Euphydryas chalcedona is a species of checkerspot butterfly in the family Nymphalidae, commonly known as the Chalcedon checkerspot or variable checkerspot. It is native to western North America, with its range extending from British Columbia south to Baja California and east to the Rocky Mountains. The species exhibits considerable variation in wing pattern and coloration across its geographic range. Like other members of the genus Euphydryas, it is associated with specific larval host plants and has been subject to conservation concern due to habitat loss and climate change impacts affecting butterfly populations across the western United States.
Euphydryas chalcedona
Chalcedon Checkerspot, Variable Checkerspot
Euphydryas chalcedona, commonly known as the Chalcedon Checkerspot or Variable Checkerspot, is a butterfly species in the family Nymphalidae. The species exhibits considerable geographic variation in appearance across its range. It is found in western North America, with populations occurring in diverse habitats from coastal areas to montane regions. Like other members of the genus Euphydryas, it has been affected by the broader declines in butterfly populations documented across the western United States.
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 editha
Edith's Checkerspot
Euphydryas editha is a checkerspot butterfly native to western North America, notable for extensive phenotypic variation across its range including differences in coloration, wing length, and body size. The species has been intensively studied for over 40 years as a model organism for metapopulation ecology, population dynamics, and conservation biology. Many populations are monophagous, relying on specific host plants for larval development. The species exhibits complex population dynamics with frequent local extinctions and recolonizations, and has experienced significant range-wide declines linked to climate change.
Euphydryas gillettii
Gillett's Checkerspot, Gillette's Checkerspot
Euphydryas gillettii is a medium-sized checkerspot butterfly native to western North America. The species exhibits variable chemical defense through sequestration of iridoid glycosides from host plants, with defensive compound concentrations varying significantly between populations based on host plant use. First described by William Barnes in 1897, this montane butterfly has been the subject of ecological research examining host-plant selection and chemical ecology.
Eupithecia agnesata
pug moth
Eupithecia agnesata is a small geometrid moth described by Taylor in 1908. It occurs in western North America from California through Oregon, Washington, and Wyoming to British Columbia. Adults are active from April to September and have been observed visiting apple flowers, contributing to nocturnal pollination services.
Eupithecia appendiculata
Eupithecia appendiculata is a small moth in the family Geometridae, first described by James Halliday McDunnough in 1945. It belongs to the genus Eupithecia, commonly known as 'pug' moths, recognized by their narrow wings and distinctive resting posture. The species has been documented as a nocturnal visitor to apple flowers, contributing to pollination services in agricultural settings.
Eupithecia bryanti
Bryant's Pug
Eupithecia bryanti is a pug moth in the family Geometridae, first described by Taylor in 1906. It is distributed across western North America from Alaska and Canada through the western United States to California. Adults are active from spring through summer.
Eupithecia castellata
Eupithecia castellata is a small moth in the family Geometridae. It occurs in western North America from California and Nevada north to Washington. The species has a wingspan of approximately 21 mm. Like other members of the genus Eupithecia, it is nocturnal and has been observed visiting flowers at night.
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 gilvipennata
Eupithecia gilvipennata is a small geometrid moth first described in 1922. It occurs along the North American Pacific coast from British Columbia southward through Colorado to California and Arizona. The species is notable for its very early spring flight period and larval specialization on Arctostaphylos species. Adults have been documented visiting apple flowers, contributing to nocturnal pollination services.
Eupithecia graefii
Graef's Pug
Eupithecia graefii, commonly known as Graef's Pug, is a small moth in the family Geometridae. It occurs in western North America from Alaska to California, inhabiting wooded areas. As a member of the diverse Eupithecia genus—known as "pugs"—it shares the characteristic narrow wings and distinctive resting posture typical of these inchworm moths. The species has been documented visiting apple flowers, contributing to nocturnal pollination services.
Eupithecia harrisonata
Eupithecia harrisonata is a small moth in the family Geometridae, commonly known as a 'pug' moth. It occurs in western North America from British Columbia to California. Adults are active in spring (March to May) and again in summer (July to August). Like other Eupithecia species, it has been observed visiting flowers and may contribute to nocturnal pollination.
Eupithecia helena
Eupithecia helena is a small geometrid moth in the genus Eupithecia, commonly known as pug moths. It is found in the western United States from Arizona and New Mexico north through Utah to Montana. Adults are active during summer months, with records from July to August. The species has been documented visiting apple flowers, contributing to nocturnal pollination services.