There are 133 insects that start with the letter F, from Fairy Shrimp to Furry Shieldback. Below you will find them listed alphabetically along with some general information about each. Click the toggle view buttons in the top right corner to switch between the card and the table view.
For each item you will find the following information
Order: The subclass the insects belongs to
Habitat: The places or type of weather the insects lives in
Scientific name: The designation that scientists use to catalog the species
Name: Fairy Shrimp
Order: Anostraca
Habitat: Temporary pools
Scientific name: Branchinecta spp.
Name: Fairyfly
Order: Hymenoptera
Habitat: Parasitic on other insects
Scientific name: Mymaridae
Name: Falcate Orangetip
Order: Lepidoptera
Habitat: Woodland edges
Scientific name: Anthocharis midea
Name: Fall Webworm
Order: Lepidoptera
Habitat: Hardwood forests
Scientific name: Hyphantria cunea
Name: Fallworm
Order: Lepidoptera
Habitat: Deciduous forests
Scientific name: Metanema inatomaria
Name: Fanfoot Moth
Order: Lepidoptera
Habitat: Forests
Scientific name: Colobochyla interpuncta
Name: Fannie Mae Beetle
Order: Coleoptera
Habitat: Soil
Scientific name: Strigoderma arboricola
Name: Fantail Moth
Order: Lepidoptera
Habitat: Woodlands
Scientific name: Photedes minimus
Name: Fantail Weevil
Order: Coleoptera
Habitat: Grasslands
Scientific name: Rhinocyllus conicus
Name: Fanwing
Order: Lepidoptera
Habitat: Alpine regions
Scientific name: Notiophila fannia
Name: Fanwing Beetle
Order: Coleoptera
Habitat: Forests
Scientific name: Dendroides canadensis
Name: Faunal Ant
Order: Hymenoptera
Habitat: Forests
Scientific name: Formica fauna
Name: Fawn Beetle
Order: Coleoptera
Habitat: Forests
Scientific name: Serica fimbriata
Name: Fawn Sphinx Moth
Order: Lepidoptera
Habitat: Deciduous forests
Scientific name: Pachysphinx modesta
Name: Feather-Horned Beetle
Order: Coleoptera
Habitat: Decaying wood
Scientific name: Cteniopodidae
Name: Feather-Leg Fly
Order: Diptera
Habitat: Aquatic
Scientific name: Trichoptera
Name: Feather-Wing Moth
Order: Lepidoptera
Habitat: Grasslands
Scientific name: Pterophoridae
Name: Feather-Winged Beetle
Order: Coleoptera
Habitat: Leaf Litter
Scientific name: Staphylinidae
Name: Feeding Frenzy Beetle
Order: Coleoptera
Habitat: Forests
Scientific name: Dendroides canadensis
Name: Felted Coccid
Order: Hemiptera
Habitat: Trees
Scientific name: Eriococcus araucariae
Name: Feltia Cutworm
Order: Lepidoptera
Habitat: Meadows and gardens
Scientific name: Feltia jaculifera
Name: Fendler's Bug
Order: Hemiptera
Habitat: Pinyon-juniper woodlands
Scientific name: Phytocoris fendleri
Name: Fennel Aphid
Order: Hemiptera
Habitat: Fennel plants
Scientific name: Hyadaphis foeniculi
Name: Fenton's Chafer
Order: Coleoptera
Habitat: Grasslands
Scientific name: Serica fentoni
Name: Fern Weevil
Order: Coleoptera
Habitat: Fern habitats
Scientific name: Sthereus pentaphyllus
Name: Ferrugineous Ant
Order: Hymenoptera
Habitat: Grasslands
Scientific name: Formica ferruginea
Name: Ferruginous Glowworm
Order: Coleoptera
Habitat: Woodland
Scientific name: Lampyris noctiluca
Name: Ferruginous Red Ant
Order: Hymenoptera
Habitat: Open habitats
Scientific name: Formica obscuripes
Name: Fewspotted Lady Beetle
Order: Coleoptera
Habitat: Crops
Scientific name: Propylea quatuordecimpunctata
Name: Feydtweiler's Jumping Spider
Order: Araneae
Habitat: Coniferous forests
Scientific name: Phidippus feydtweilerae
Name: Fiddler Beetle
Order: Coleoptera
Habitat: Wetlands
Scientific name: Paratendipes
Name: Fiddler Crab
Order: Decapoda
Habitat: Coastal habitats
Scientific name: Uca spp.
Name: Field Cricket
Order: Orthoptera
Habitat: Grasslands
Scientific name: Gryllus pennsylvanicus
Name: Field Digger Wasp
Order: Hymenoptera
Habitat: Open habitats
Scientific name: Philantus gibbosus
Name: Fiery Searcher Beetle
Order: Coleoptera
Habitat: Forests
Scientific name: Calosoma scrutator
Name: Filbert Aphid
Order: Hemiptera
Habitat: Filbert trees
Scientific name: Myzocallis coryli
Name: Filbertworm
Order: Lepidoptera
Habitat: Orchard crops
Scientific name: Cydia latiferreana
Name: Filecked Moth
Order: Lepidoptera
Habitat: Deciduous forests
Scientific name: Eumasia parella
Name: Filigreed Darkling Beetle
Order: Coleoptera
Habitat: Coastal regions
Scientific name: Phaleria picipes
Name: Filigreed Geometer Moth
Order: Lepidoptera
Habitat: Woodlands
Scientific name: Iridopsis defectaria
Name: Filigreed June Beetle
Order: Coleoptera
Habitat: Grasslands
Scientific name: Polyphylla decemlineata
Name: Filmy Forage Beetle
Order: Coleoptera
Habitat: Forests and Grasslands
Scientific name: Lathropus filiformis
Name: Fimbriate Beetle
Order: Coleoptera
Habitat: Aquatic
Scientific name: Hydrochara fimbriata
Name: Fine-Lined Pinion Moth
Order: Lepidoptera
Habitat: Woodlands
Scientific name: Lithophane gracilis
Name: Finely-Barred Dart
Order: Lepidoptera
Habitat: Scrublands
Scientific name: Euxoa verrucosa
Name: Fingered Lacewing
Order: Neuroptera
Habitat: Woodlands
Scientific name: Nemoptera
Name: Fir Cone Midge
Order: Diptera
Habitat: Coniferous forests
Scientific name: Contarinia oregonensis
Name: Fir Engraver Beetle
Order: Coleoptera
Habitat: Coniferous Forests
Scientific name: Scolytus ventralis
Name: Fire-Tailed Glow-Worm
Order: Coleoptera
Habitat: Moist soils
Scientific name: Phengodes laticollis
Name: Firebrat
Order: Zygentoma
Habitat: Warm Environments
Scientific name: Thermobia domestica
Name: Fireflies
Order: Coleoptera
Habitat: Grasslands/Woodlands
Scientific name: Photinus spp.
Name: Firefly
Order: Coleoptera
Habitat: Worldwide
Scientific name: Lampyridae
Name: Firefly Larva
Order: Coleoptera
Habitat: Meadows
Scientific name: Lampyridae
Name: Firefly Squat Lobster
Order: Decapoda
Habitat: Deep ocean
Scientific name: Munidopsidae
Name: Fireworm
Order: Lepidoptera
Habitat: Cranberry Bogs
Scientific name: Rhopobota naevana
Name: Fireworm Moth
Order: Lepidoptera
Habitat: Bogs
Scientific name: Neocoptorhyncha fumiferana
Name: Firmament Beetle
Order: Coleoptera
Habitat: Caves
Scientific name: Ptomaphagus
Name: Fish Fly
Order: Megaloptera
Habitat: Aquatic
Scientific name: Chauliodes rastricornis
Name: Fishhook Chafer
Order: Coleoptera
Habitat: Prairies
Scientific name: Macrodactylus subspinosus
Name: Five-Spined Lady Beetle
Order: Coleoptera
Habitat: Forests
Scientific name: Chilocorus stigma
Name: Flame Beetle
Order: Coleoptera
Habitat: Forests
Scientific name: Trogossita virescens
Name: Flame Skimmer Dragonfly
Order: Odonata
Habitat: Ponds and lakes
Scientific name: Libellula saturata
Name: Flame-Bordered Dart
Order: Lepidoptera
Habitat: Grasslands and Heathlands
Scientific name: Ochropleura plecta
Name: Flame-Bordered Pinion
Order: Lepidoptera
Habitat: Deciduous Forests
Scientific name: Lithophane semibrunnea
Name: Flame-Tailed Moth
Order: Lepidoptera
Habitat: Woodlands
Scientific name: Pyrrhia umbra
Name: Flame-Tipped Crane Fly
Order: Diptera
Habitat: Wetlands
Scientific name: Prionocera turcica
Name: Flannel Moth
Order: Lepidoptera
Habitat: Forests
Scientific name: Megalopyge opercularis
Name: Flannel Moth Caterpillar
Order: Lepidoptera
Habitat: Hardwood forests
Scientific name: Megalopyge opercularis
Name: Flat Bug
Order: Hemiptera
Habitat: Forests
Scientific name: Aradus spp.
Name: Flat Centipede
Order: Scolopendromorpha
Habitat: Forests
Scientific name: Scolopocryptops sexspinosus
Name: Flat-Backed Frog Beetle
Order: Coleoptera
Habitat: Forests
Scientific name: Aphodius scrofa
Name: Flat-Lined Pinion Moth
Order: Lepidoptera
Habitat: Woodlands
Scientific name: Lithophane unimoda
Name: Flat-Topped Ant
Order: Hymenoptera
Habitat: Deciduous forests
Scientific name: Brachymyrmex depilis
Name: Flax Aphid
Order: Hemiptera
Habitat: Cultivated Crops
Scientific name: Macrosiphoniella lini
Name: Flax Bug
Order: Hemiptera
Habitat: Flax Fields
Scientific name: Orsillus spp.
Name: Flea
Order: Siphonaptera
Habitat: Hosts
Scientific name: Siphonaptera
Name: Fleece Moth
Order: Lepidoptera
Habitat: Coniferous forests
Scientific name: Monopis monachella
Name: Flesh Fly
Order: Diptera
Habitat: Carrion
Scientific name: Sarcophagidae
Name: Flichotte Hawthorn Moth
Order: Lepidoptera
Habitat: Orchards
Scientific name: Scrobipalpula stagnata
Name: Flightless Bark Beetle
Order: Coleoptera
Habitat: Decaying wood
Scientific name: Phloeodes diabolicus
Name: Flightless Ground Beetle
Order: Coleoptera
Habitat: Alpine Regions
Scientific name: Nebria spp.
Name: Flightless Moth
Order: Lepidoptera
Habitat: Islands
Scientific name: Agathodes
Name: Flightless Water Beetle
Order: Coleoptera
Habitat: Freshwater
Scientific name: Elmidae
Name: Floater Ant
Order: Hymenoptera
Habitat: Wetlands
Scientific name: Polyrhachis
Name: Floored Beetle
Order: Coleoptera
Habitat: Leaf litter
Scientific name: Bolitotherus cornutus
Name: Floppy-Eared Beetle
Order: Coleoptera
Habitat: Forests
Scientific name: Platydema ruficorne
Name: Floral Beetle
Order: Coleoptera
Habitat: Flowers
Scientific name: Anthicidae
Name: Floury Moth
Order: Lepidoptera
Habitat: Stored Products
Scientific name: Ephestia kuehniella
Name: Flower Beetle
Order: Coleoptera
Habitat: Flowers
Scientific name: Phalacridae
Name: Flower Bug
Order: Hemiptera
Habitat: Flowers
Scientific name: Anthocoridae
Name: Flower Crab Spider
Order: Araneae
Habitat: Grasslands
Scientific name: Misumena vatia
Name: Flower-Loving Fly
Order: Diptera
Habitat: Flowers
Scientific name: Anthomyiidae
Name: Flucloxacillin Beetle
Order: Coleoptera
Habitat: Grasslands
Scientific name: Cantharis rufa
Name: Fluffy Carpet Moth
Order: Lepidoptera
Habitat: Temperate Forests
Scientific name: Orgyia antiqua
Name: Fluffy Moth
Order: Lepidoptera
Habitat: Deciduous forests
Scientific name: Megalopyge crispata
Name: Fluffy Tussock Moth
Order: Lepidoptera
Habitat: Woodlands
Scientific name: Orgyia leucostigma
Name: Fluorescent Fungus Gnat
Order: Diptera
Habitat: Fungi
Scientific name: Orfelia fultoni
Name: Fly-Attracting Scorpionfly
Order: Mecoptera
Habitat: Forests
Scientific name: Bittacus
Name: Fly-Catching Mantis
Order: Mantodea
Habitat: Tropical forests
Scientific name: Stenophylla
Name: Fly-Eating Ant
Order: Hymenoptera
Habitat: Forests
Scientific name: Leptogenys distinguenda
Name: Flying Ant
Order: Hymenoptera
Habitat: Nests in wood or soil
Scientific name: Formicidae
Name: Foggy Pine Aphid
Order: Hemiptera
Habitat: Ponderosa pine forests
Scientific name: Cinara strobi
Name: Fogstand Moth
Order: Lepidoptera
Habitat: High mountains
Scientific name: Operophtera brumata
Name: Foreleg Fly
Order: Diptera
Habitat: Aquatic
Scientific name: Tanyderidae
Name: Forest Bug
Order: Hemiptera
Habitat: Woodlands
Scientific name: Pentatoma rufipes
Name: Forest Cockroach
Order: Blattodea
Habitat: Forests
Scientific name: Ectobius pallidus
Name: Forest Crab Spider
Order: Araneae
Habitat: Forests
Scientific name: Xysticus
Name: Forest Crane Fly
Order: Diptera
Habitat: Deciduous Forests
Scientific name: Ctenophora flaveolata
Name: Forest Cuckoo Wasp
Order: Hymenoptera
Habitat: Forests
Scientific name: Chrysis cyanea
Name: Forest Ghost Moth
Order: Lepidoptera
Habitat: Coniferous Forests
Scientific name: Hepialus humuli
Name: Forest Giant Lacewing
Order: Neuroptera
Habitat: Forests
Scientific name: Polystoechotes punctatus
Name: Forester Moth
Order: Lepidoptera
Habitat: Forests
Scientific name: Procridinae
Name: Forked Fungus Beetle
Order: Coleoptera
Habitat: Fungi
Scientific name: Bolitotherus cornutus
Name: Forked Owl Moth
Order: Lepidoptera
Habitat: Deciduous Forests
Scientific name: Cerura vinula
Name: Forktailed Bush Katydid
Order: Orthoptera
Habitat: Shrublands
Scientific name: Scudderia furcata
Name: Formosan Subterranean Termite
Order: Isoptera
Habitat: Urban areas
Scientific name: Coptotermes formosanus
Name: Fossil Scorpion Fly
Order: Mecoptera
Habitat: Forests
Scientific name: Panorpidae
Name: Fossil Scorpionfly
Order: Mecoptera
Habitat: Fossils
Scientific name: Holcorpa
Name: Four-Lined Beetle
Order: Coleoptera
Habitat: Wetlands
Scientific name: Donacia crassipes
Name: Foxglove Aphid
Order: Hemiptera
Habitat: Foxglove plants
Scientific name: Aulacorthum solani
Name: Fragrant Scorpionfly
Order: Mecoptera
Habitat: Forests
Scientific name: Panorpa lugubris
Name: Fragrant Underwing Moth
Order: Lepidoptera
Habitat: Woodlands
Scientific name: Catocala concumbens
Name: French Wasp
Order: Hymenoptera
Habitat: Urban and suburban areas
Scientific name: Polistes gallicus
Name: Fringed Fungus Moth
Order: Lepidoptera
Habitat: Fungi
Scientific name: Achroia grisella
Name: Fringed Lacewing
Order: Neuroptera
Habitat: Forests
Scientific name: Nallachius americanus
Name: Frit Fly
Order: Diptera
Habitat: Cereals
Scientific name: Oscinella frit
Name: Froghoppers
Order: Hemiptera
Habitat: Plants
Scientific name: Cercopidae
Name: Frost Moth
Order: Lepidoptera
Habitat: Boreal forests
Scientific name: Cisseps fulvicollis
Name: Fruit Flies
Order: Diptera
Habitat: Fruits
Scientific name: Tephritidae
Name: Fulgorid Planthopper
Order: Hemiptera
Habitat: Forests
Scientific name: Dichoptera hyalinata
Name: Fungus Gnats
Order: Diptera
Habitat: Fungi
Scientific name: Mycetophilidae
Name: Furcula Moth
Order: Lepidoptera
Habitat: Forests
Scientific name: Furcula interrupta
Name: Furry Shieldback
Order: Orthoptera
Habitat: Grasslands
Scientific name: Atlanticus testaceus
| Name | Order | Habitat | Scientific name |
|---|---|---|---|
| Fairy Shrimp | Anostraca | Temporary pools | Branchinecta spp. |
| Fairyfly | Hymenoptera | Parasitic on other insects | Mymaridae |
| Falcate Orangetip | Lepidoptera | Woodland edges | Anthocharis midea |
| Fall Webworm | Lepidoptera | Hardwood forests | Hyphantria cunea |
| Fallworm | Lepidoptera | Deciduous forests | Metanema inatomaria |
| Fanfoot Moth | Lepidoptera | Forests | Colobochyla interpuncta |
| Fannie Mae Beetle | Coleoptera | Soil | Strigoderma arboricola |
| Fantail Moth | Lepidoptera | Woodlands | Photedes minimus |
| Fantail Weevil | Coleoptera | Grasslands | Rhinocyllus conicus |
| Fanwing | Lepidoptera | Alpine regions | Notiophila fannia |
| Fanwing Beetle | Coleoptera | Forests | Dendroides canadensis |
| Faunal Ant | Hymenoptera | Forests | Formica fauna |
| Fawn Beetle | Coleoptera | Forests | Serica fimbriata |
| Fawn Sphinx Moth | Lepidoptera | Deciduous forests | Pachysphinx modesta |
| Feather-Horned Beetle | Coleoptera | Decaying wood | Cteniopodidae |
| Feather-Leg Fly | Diptera | Aquatic | Trichoptera |
| Feather-Wing Moth | Lepidoptera | Grasslands | Pterophoridae |
| Feather-Winged Beetle | Coleoptera | Leaf Litter | Staphylinidae |
| Feeding Frenzy Beetle | Coleoptera | Forests | Dendroides canadensis |
| Felted Coccid | Hemiptera | Trees | Eriococcus araucariae |
| Feltia Cutworm | Lepidoptera | Meadows and gardens | Feltia jaculifera |
| Fendler's Bug | Hemiptera | Pinyon-juniper woodlands | Phytocoris fendleri |
| Fennel Aphid | Hemiptera | Fennel plants | Hyadaphis foeniculi |
| Fenton's Chafer | Coleoptera | Grasslands | Serica fentoni |
| Fern Weevil | Coleoptera | Fern habitats | Sthereus pentaphyllus |
| Ferrugineous Ant | Hymenoptera | Grasslands | Formica ferruginea |
| Ferruginous Glowworm | Coleoptera | Woodland | Lampyris noctiluca |
| Ferruginous Red Ant | Hymenoptera | Open habitats | Formica obscuripes |
| Fewspotted Lady Beetle | Coleoptera | Crops | Propylea quatuordecimpunctata |
| Feydtweiler's Jumping Spider | Araneae | Coniferous forests | Phidippus feydtweilerae |
| Fiddler Beetle | Coleoptera | Wetlands | Paratendipes |
| Fiddler Crab | Decapoda | Coastal habitats | Uca spp. |
| Field Cricket | Orthoptera | Grasslands | Gryllus pennsylvanicus |
| Field Digger Wasp | Hymenoptera | Open habitats | Philantus gibbosus |
| Fiery Searcher Beetle | Coleoptera | Forests | Calosoma scrutator |
| Filbert Aphid | Hemiptera | Filbert trees | Myzocallis coryli |
| Filbertworm | Lepidoptera | Orchard crops | Cydia latiferreana |
| Filecked Moth | Lepidoptera | Deciduous forests | Eumasia parella |
| Filigreed Darkling Beetle | Coleoptera | Coastal regions | Phaleria picipes |
| Filigreed Geometer Moth | Lepidoptera | Woodlands | Iridopsis defectaria |
| Filigreed June Beetle | Coleoptera | Grasslands | Polyphylla decemlineata |
| Filmy Forage Beetle | Coleoptera | Forests and Grasslands | Lathropus filiformis |
| Fimbriate Beetle | Coleoptera | Aquatic | Hydrochara fimbriata |
| Fine-Lined Pinion Moth | Lepidoptera | Woodlands | Lithophane gracilis |
| Finely-Barred Dart | Lepidoptera | Scrublands | Euxoa verrucosa |
| Fingered Lacewing | Neuroptera | Woodlands | Nemoptera |
| Fir Cone Midge | Diptera | Coniferous forests | Contarinia oregonensis |
| Fir Engraver Beetle | Coleoptera | Coniferous Forests | Scolytus ventralis |
| Fire-Tailed Glow-Worm | Coleoptera | Moist soils | Phengodes laticollis |
| Firebrat | Zygentoma | Warm Environments | Thermobia domestica |
| Fireflies | Coleoptera | Grasslands/Woodlands | Photinus spp. |
| Firefly | Coleoptera | Worldwide | Lampyridae |
| Firefly Larva | Coleoptera | Meadows | Lampyridae |
| Firefly Squat Lobster | Decapoda | Deep ocean | Munidopsidae |
| Fireworm | Lepidoptera | Cranberry Bogs | Rhopobota naevana |
| Fireworm Moth | Lepidoptera | Bogs | Neocoptorhyncha fumiferana |
| Firmament Beetle | Coleoptera | Caves | Ptomaphagus |
| Fish Fly | Megaloptera | Aquatic | Chauliodes rastricornis |
| Fishhook Chafer | Coleoptera | Prairies | Macrodactylus subspinosus |
| Five-Spined Lady Beetle | Coleoptera | Forests | Chilocorus stigma |
| Flame Beetle | Coleoptera | Forests | Trogossita virescens |
| Flame Skimmer Dragonfly | Odonata | Ponds and lakes | Libellula saturata |
| Flame-Bordered Dart | Lepidoptera | Grasslands and Heathlands | Ochropleura plecta |
| Flame-Bordered Pinion | Lepidoptera | Deciduous Forests | Lithophane semibrunnea |
| Flame-Tailed Moth | Lepidoptera | Woodlands | Pyrrhia umbra |
| Flame-Tipped Crane Fly | Diptera | Wetlands | Prionocera turcica |
| Flannel Moth | Lepidoptera | Forests | Megalopyge opercularis |
| Flannel Moth Caterpillar | Lepidoptera | Hardwood forests | Megalopyge opercularis |
| Flat Bug | Hemiptera | Forests | Aradus spp. |
| Flat Centipede | Scolopendromorpha | Forests | Scolopocryptops sexspinosus |
| Flat-Backed Frog Beetle | Coleoptera | Forests | Aphodius scrofa |
| Flat-Lined Pinion Moth | Lepidoptera | Woodlands | Lithophane unimoda |
| Flat-Topped Ant | Hymenoptera | Deciduous forests | Brachymyrmex depilis |
| Flax Aphid | Hemiptera | Cultivated Crops | Macrosiphoniella lini |
| Flax Bug | Hemiptera | Flax Fields | Orsillus spp. |
| Flea | Siphonaptera | Hosts | Siphonaptera |
| Fleece Moth | Lepidoptera | Coniferous forests | Monopis monachella |
| Flesh Fly | Diptera | Carrion | Sarcophagidae |
| Flichotte Hawthorn Moth | Lepidoptera | Orchards | Scrobipalpula stagnata |
| Flightless Bark Beetle | Coleoptera | Decaying wood | Phloeodes diabolicus |
| Flightless Ground Beetle | Coleoptera | Alpine Regions | Nebria spp. |
| Flightless Moth | Lepidoptera | Islands | Agathodes |
| Flightless Water Beetle | Coleoptera | Freshwater | Elmidae |
| Floater Ant | Hymenoptera | Wetlands | Polyrhachis |
| Floored Beetle | Coleoptera | Leaf litter | Bolitotherus cornutus |
| Floppy-Eared Beetle | Coleoptera | Forests | Platydema ruficorne |
| Floral Beetle | Coleoptera | Flowers | Anthicidae |
| Floury Moth | Lepidoptera | Stored Products | Ephestia kuehniella |
| Flower Beetle | Coleoptera | Flowers | Phalacridae |
| Flower Bug | Hemiptera | Flowers | Anthocoridae |
| Flower Crab Spider | Araneae | Grasslands | Misumena vatia |
| Flower-Loving Fly | Diptera | Flowers | Anthomyiidae |
| Flucloxacillin Beetle | Coleoptera | Grasslands | Cantharis rufa |
| Fluffy Carpet Moth | Lepidoptera | Temperate Forests | Orgyia antiqua |
| Fluffy Moth | Lepidoptera | Deciduous forests | Megalopyge crispata |
| Fluffy Tussock Moth | Lepidoptera | Woodlands | Orgyia leucostigma |
| Fluorescent Fungus Gnat | Diptera | Fungi | Orfelia fultoni |
| Fly-Attracting Scorpionfly | Mecoptera | Forests | Bittacus |
| Fly-Catching Mantis | Mantodea | Tropical forests | Stenophylla |
| Fly-Eating Ant | Hymenoptera | Forests | Leptogenys distinguenda |
| Flying Ant | Hymenoptera | Nests in wood or soil | Formicidae |
| Foggy Pine Aphid | Hemiptera | Ponderosa pine forests | Cinara strobi |
| Fogstand Moth | Lepidoptera | High mountains | Operophtera brumata |
| Foreleg Fly | Diptera | Aquatic | Tanyderidae |
| Forest Bug | Hemiptera | Woodlands | Pentatoma rufipes |
| Forest Cockroach | Blattodea | Forests | Ectobius pallidus |
| Forest Crab Spider | Araneae | Forests | Xysticus |
| Forest Crane Fly | Diptera | Deciduous Forests | Ctenophora flaveolata |
| Forest Cuckoo Wasp | Hymenoptera | Forests | Chrysis cyanea |
| Forest Ghost Moth | Lepidoptera | Coniferous Forests | Hepialus humuli |
| Forest Giant Lacewing | Neuroptera | Forests | Polystoechotes punctatus |
| Forester Moth | Lepidoptera | Forests | Procridinae |
| Forked Fungus Beetle | Coleoptera | Fungi | Bolitotherus cornutus |
| Forked Owl Moth | Lepidoptera | Deciduous Forests | Cerura vinula |
| Forktailed Bush Katydid | Orthoptera | Shrublands | Scudderia furcata |
| Formosan Subterranean Termite | Isoptera | Urban areas | Coptotermes formosanus |
| Fossil Scorpion Fly | Mecoptera | Forests | Panorpidae |
| Fossil Scorpionfly | Mecoptera | Fossils | Holcorpa |
| Four-Lined Beetle | Coleoptera | Wetlands | Donacia crassipes |
| Foxglove Aphid | Hemiptera | Foxglove plants | Aulacorthum solani |
| Fragrant Scorpionfly | Mecoptera | Forests | Panorpa lugubris |
| Fragrant Underwing Moth | Lepidoptera | Woodlands | Catocala concumbens |
| French Wasp | Hymenoptera | Urban and suburban areas | Polistes gallicus |
| Fringed Fungus Moth | Lepidoptera | Fungi | Achroia grisella |
| Fringed Lacewing | Neuroptera | Forests | Nallachius americanus |
| Frit Fly | Diptera | Cereals | Oscinella frit |
| Froghoppers | Hemiptera | Plants | Cercopidae |
| Frost Moth | Lepidoptera | Boreal forests | Cisseps fulvicollis |
| Fruit Flies | Diptera | Fruits | Tephritidae |
| Fulgorid Planthopper | Hemiptera | Forests | Dichoptera hyalinata |
| Fungus Gnats | Diptera | Fungi | Mycetophilidae |
| Furcula Moth | Lepidoptera | Forests | Furcula interrupta |
| Furry Shieldback | Orthoptera | Grasslands | Atlanticus testaceus |