List of families for St. Clair County (Illinois)
257 Families width 1774 Species and 29 Subspecies
| Acanaloniidae Amyot and Se..., 1843 | Acanalonid planthoppers | 1 | Species | Taxom |
| Achilidae Stål, 1866 | Achilid Planthoppers | 1 | Species | Taxom |
| Acrididae MacLeay, 1819 | Grasshoppers and locusts | 30 | Species | Taxom |
| Adelidae Bruand, 1851 | Adelid Moths | 1 | Species | Taxom |
| Aeshnidae Rambur, 1842 | Darners | 4 | Species | Taxom |
| Agromyzidae Fallen, 1823 | Leaf miner flies | 1 | Species | Taxom |
| Amphipsocidae Mockford, 1978 | Hairy-winged Barklice | 1 | Species | Taxom |
| Andrenidae Webster, 1913 | Andrenid bees | 45 | Species | Taxom |
| Anthelidae Turner, 1904 | Australian Lappet Moths | 1 | Species | Taxom |
| Anthicidae Latreille, 1819 | Ant beetles | 1 | Species | Taxom |
| Anthomyiidae Robineau-Des..., 1830 | Anthomyiid flies | 1 | Species | Taxom |
| Aphididae Latreille, 1802 | Aphids | 14 | Species | Taxom |
| Aphrophoridae Evans, 1946 | Froghoppers | 2 | Species | Taxom |
| Apidae Latreille, 1802 | Bumble bees | 52 | Species | Taxom |
| Aradidae Spinola, 1837 | Flat bug | 1 | Species | Taxom |
| Argidae Konow, 1890 | Argid flies | 2 | Species | Taxom |
| Ascalaphidae Rambur, 1842 | Owlflies | 2 | Species | Taxom |
| Asilidae Latreille, 1802 | Assassin flies | 11 | Species | Taxom |
| Autostichidae Le Marchand, 1947 | Autostichid Moths | 1 | Species | Taxom |
| Baetidae Leach, 1815 | Mayflies | 3 | Species | Taxom |
| Belostomatidae Leach, 1815 | Alligator ticks | 2 | Species | Taxom |
| Bethylidae Halliday, 1839 | Bethylid wasps | 1 | Species | Taxom |
| Bombycidae Latreille, 1802 | Lappet moths | 1 | Species | Taxom |
| Bombyliidae Latreille, 1802 | Bee Flies | 5 | Species | Taxom |
| Braconidae Latreille, 1829 | Braconid wasps | 8 | Species | Taxom |
| Brentidae Billberg, 1820 | Brenthidae | 2 | Species | Taxom |
| Buprestidae Leach, 1815 | Flat-headed wood-borers | 6 | Species | Taxom |
| Caeciliusidae Kolbe, 1880 | Lizard Barklice | 1 | Species | Taxom |
| Calliphoridae Brauer & Ber..., 1889 | Blow flies | 7 | Species | Taxom |
| Calopterygidae Selys, 1850 | Broad-winged damselflies | 2 | Species | Taxom |
| Cantharidae Imhoff, 1856 | Cantharids | 4 | Species | Taxom |
| Capniidae Klapálek, 1905 | Capniid winter stoneflies | 2 | Species | Taxom |
| Carabidae Latreille, 1802 | Carabid beetles | 56 | Species | Taxom |
| Cecidomyiidae Newman, 1834 | Forest Midges | 1 | Species | Taxom |
| Cerambycidae Latreille, 1802 | Long Horn beetles | 18 | Species | Taxom |
| Ceratopogonidae Newman, 1834 | Biting midge | 1 | Species | Taxom |
| Chalcididae Latreille, 1817 | Chalcidid wasps | 1 | Species | Taxom |
| Chironomidae Erichson, 1842 | Chironomids | 2 | Species | Taxom |
| Choreutidae Stainton, 1854 | Choreuitid Moths | 1 | Species | Taxom |
| Chrysididae Latreille, 1802 | Chrysidid wasps | 3 | Species | Taxom |
| Chrysomelidae Latreille, 1802 | Casebearers | 24 | Species | Taxom |
| Chrysopidae Schneider, 1851 | And Green Lacewings | 2 | Species | Taxom |
| Cicadellidae Latreille, 1802 | Cicadellids | 14 | Species | Taxom |
| Cicadidae Westwood, 1840 | Cicada | 4 | Species | Taxom |
| Cimbicidae Kirby, 1837 | Cimbicid sawflies | 1 | Species | Taxom |
| Clastopteridae Stål, 1858 | Clastopterid Spittlebugs | 1 | Species | Taxom |
| Cleridae Latreille, 1802 | Checkered Beetle | 2 | Species | Taxom |
| Clusiidae Schönherr, 1840 | Clusiid flies | 1 | Species | Taxom |
| Coccinellidae Latreille, 1807 | Coccinelles | 13 | Species | Taxom |
| Coenagrionidae Kirby, 1890 | Narrow-winged damselflies | 17 | Species | Taxom |
| Coleophoridae Hübner, 1825 | Case moths | 2 | Species | Taxom |
| Colletidae Lepeletier, 1841 | Colletid bees | 5 | Species | Taxom |
| Corduliidae Selys-Longch..., 1850 | Baskettails | 5 | Species | Taxom |
| Coreidae Leach, 1815 | Broad-headed bugs | 4 | Species | Taxom |
| Corixidae Leach, 1815 | Lesser Water-Boatman | 7 | Species | Taxom |
| Cosmopterigidae Heinemann & ..., 1876 | Cosmet Moths | 3 | Species | Taxom |
| Cossidae Leach, 1815 | Borers | 1 | Species | Taxom |
| Crabronidae Latreille, 1802 | Bee Wolves | 31 | Species | Taxom |
| Crambidae Latreille, 1810 | Crambid Snout Moths | 60 | Species | Taxom |
| Cucujidae Latreille, 1802 | Flat bark beetles | 1 | Species | Taxom |
| Culicidae Meigen, 1818 | Mosquito | 17 | Species | Taxom |
| Curculionidae Latreille, 1802 | Ambrosia beetles | 42 | Species | Taxom |
| Cymidae Baerensprung, 1860 | | 1 | Species | Taxom |
| Cynipidae Latreille, 1802 | Cynipid gall wasps | 1 | Species | Taxom |
| Delphacidae Leach, 1815 | Delphacid planthoppers | 0 | Species | Taxom |
| Dermestidae Hope, 1840 | Carpet beetles | 7 | Species | Taxom |
| Diapriidae Latreille, 1796 | Diapriid wasps | 1 | Species | Taxom |
| Diprionidae Rohwer, 1911 | Conifer sawflies | 1 | Species | Taxom |
| Dolichopodidae Latreille, 1809 | Long legged flies | 3 | Species | Taxom |
| Drepanidae Meyrick, 1895 | Drepanids | 1 | Species | Taxom |
| Drosophilidae Rondani, 1856 | Fruit flies | 0 | Species | Taxom |
| Dryopidae Billberg, 1820 | Long toed water beetle | 2 | Species | Taxom |
| Dytiscidae Leach, 1815 | Diving beetles | 11 | Species | Taxom |
| Elachistidae Bruand, 1851 | Elachistid moths | 7 | Species | Taxom |
| Elateridae Leach, 1815 | Click Beetle | 7 | Species | Taxom |
| Elmidae Curtis, 1830 | Drive beetles | 7 | Species | Taxom |
| Empididae Latreille, 1809 | Balloon flies | 2 | Species | Taxom |
| Encyrtidae Walker, 1837 | Encyrtid wasps | 2 | Species | Taxom |
| Endomychidae Leach, 1815 | False Ladybirds | 2 | Species | Taxom |
| Enicocephalidae Stål, 1860 | Gnat bug | 1 | Species | Taxom |
| Epermeniidae Spuler, 1910 | Epermeniid moths | 1 | Species | Taxom |
| Ephemeridae Leach, 1817 | Burrowing mayflies | 3 | Species | Taxom |
| Ephydridae Zetterstedt, 1837 | Brine flies | 1 | Species | Taxom |
| Epipygidae Hamilton, 2001 | | 1 | Species | Taxom |
| Epipyropidae Dyar, 1903 | Planthopper Parasite Moths | 1 | Species | Taxom |
| Erebidae Leach, 1815 | Erebid Moths | 99 | Species | Taxom |
| Eriocraniidae Rebel, 1901 | Eriocraniid moths | 1 | Species | Taxom |
| Erotylidae Latreille, 1802 | Pleasing Fungus Beetle | 1 | Species | Taxom |
| Eulophidae Westwood, 1829 | Eulophid wasps | 3 | Species | Taxom |
| Eupelmidae Walker, 1833 | Eupelmid wasps | 0 | Species | Taxom |
| Euteliidae Grote, 1882 | Euteliid Moths | 3 | Species | Taxom |
| Fanniidae Schnabl & Dz..., 1911 | Latrine flies | 2 | Species | Taxom |
| Figitidae Thomson, 1862 | Figitid wasps | 0 | Species | Taxom |
| Forficulidae Stephens, 1829 | Common Earwig | 1 | Species | Taxom |
| Formicidae Latreille, 1809 | Ants | 46 | Species | Taxom |
| Gasteruptiidae Ashmead, 1900 | Carrot Wasps | 1 | Species | Taxom |
| Gelechiidae Stainton, 1854 | Gelechiid moths | 16 | Species | Taxom |
| Geometridae Leach, 1815 | Cankerworm moths | 38 | Species | Taxom |
| Geotrupidae Latreille, 1802 | Dor beetles | 1 | Species | Taxom |
| Gerridae Leach, 1815 | Jesus bugs | 1 | Species | Taxom |
| Gomphidae Rambur, 1842 | Club-tailed dragonflies | 6 | Species | Taxom |
| Gracillariidae Stainton, 1854 | Blotch leaf miner moths | 2 | Species | Taxom |
| Gryllidae Bolivar, 1878 | Crickets | 1 | Species | Taxom |
| Gryllotalpidae Saussure, 1870 | Mole cricket | 1 | Species | Taxom |
| Gyrinidae Latreille, 1802 | Whirligig beetle | 3 | Species | Taxom |
| Halictidae Thomson, 1869 | Flower bees | 21 | Species | Taxom |
| Haliplidae Aubé, 1836 | Crawling Water Beetle | 2 | Species | Taxom |
| Helicopsychidae Ulmer, 1912 | Snail Case caddisflies | 1 | Species | Taxom |
| Helophoridae (Leach, 1815) | Water scavenger beetles | 1 | Species | Taxom |
| Hemerobiidae Latreille, 1802 | Brown Lacewing | 3 | Species | Taxom |
| Heptageniidae Needham, 1901 | Flat-Bodied Up-Wings Heptageniidae | 3 | Species | Taxom |
| Hesperiidae Latreille, 1809 | Skipper | 34 | Species | Taxom |
| Heteroceridae MacLeay, 1825 | Mud beetles | 2 | Species | Taxom |
| Histeridae Gyllenhal, 1808 | Clown beetle | 32 | Species | Taxom |
| Hybosoridae Erichson, 1847 | Pill scarab beetles | 1 | Species | Taxom |
| Hydraenidae Mulsant, 1844 | Cascade Beetles | 1 | Species | Taxom |
| Hydrobiosidae Ulmer, 1905 | | 2 | Species | Taxom |
| Hydrophilidae Latreille, 1802 | Silver Water Beetles | 11 | Species | Taxom |
| Hydropsychidae Curtis, 1835 | Net Spinning caddisflies | 8 | Species | Taxom |
| Hydroptilidae Stephens, 1836 | Micro caddisflies | 4 | Species | Taxom |
| Ichneumonidae Latreille, 1802 | Ichneumon flies | 22 | Species | Taxom |
| Isostictidae Fraser, 1955 | Narrow-wings | 1 | Species | Taxom |
| Kinnaridae Muir, 1925 | Kinnarid Planthoppers | 1 | Species | Taxom |
| Labiidae (Burr, 1909) | Little earwig | 1 | Species | Taxom |
| Lampyridae Latreille, 1817 | Fireflies | 3 | Species | Taxom |
| Lasiocampidae Harris, 1841 | Eggar Moths | 4 | Species | Taxom |
| Lauxaniidae Macquart, 1835 | Beach flies | 0 | Species | Taxom |
| Lepidopsocidae Lienhard & S..., 2002 | Scaly-winged bark louse | 1 | Species | Taxom |
| Leptoceridae Leach, 1815 | Long Horned caddisflies | 11 | Species | Taxom |
| Leptophlebiidae Banks, 1900 | Leptophlebiids | 0 | Species | Taxom |
| Lestidae Calvert, 1901 | Spread-winged damselflies | 9 | Species | Taxom |
| Libellulidae Rambur, 1842 | Chasers | 22 | Species | Taxom |
| Limacodidae Duponchel, 1845 | Cup moths | 12 | Species | Taxom |
| Limnephilidae Kolenati, 1848 | Northern caddisflies | 7 | Species | Taxom |
| Lonchopteridae Curtis, 1839 | Pointed-wing flies | 1 | Species | Taxom |
| Lucanidae Latreille, 1804 | Stag Beetle | 3 | Species | Taxom |
| Lycaenidae Leach, 1815 | Blue butterflies | 21 | Species | Taxom |
| Lycidae Laporte, 1836 | Lycid beetles | 2 | Species | Taxom |
| Lygaeidae Schilling, 1829 | Chinch bugs | 2 | Species | Taxom |
| Lyonetiidae Stainton, 1854 | Lyonet Moths | 1 | Species | Taxom |
| Mantispidae Leach, 1815 | Mantid lacewings | 1 | Species | Taxom |
| Megachilidae Schenk, 1860 | And Resin Bees | 22 | Species | Taxom |
| Megalopygidae Herrich-Schä..., 1855 | Crinkled Flannel Moths | 3 | Species | Taxom |
| Megapodagrionidae Tillyard, 1917 | Flatwing | 1 | Species | Taxom |
| Melandryidae Leach, 1815 | False Darkling Beetle | 1 | Species | Taxom |
| Meloidae Gyllenhal, 1810 | Blister Beetle | 1 | Species | Taxom |
| Melyridae Leach, 1815 | Malachite Beetles | 1 | Species | Taxom |
| Membracidae Germar, 1821 | Horned Treehoppers | 5 | Species | Taxom |
| Menoponidae Mjöberg, 1910 | Bird lice | 1 | Species | Taxom |
| Meropeidae Espen-Petersen, 1921 | Earwig-flies | 1 | Species | Taxom |
| Mimallonidae Burmeister, 1878 | Mimallonid Moths | 2 | Species | Taxom |
| Miridae Hahn, 1831 | Capsid bugs | 3 | Species | Taxom |
| Mordellidae Latreille, 1802 | Pintail beetles | 3 | Species | Taxom |
| Muscidae Latreille, 1802 | Face flies | 6 | Species | Taxom |
| Mutillidae André, 1907 | Cow ant | 3 | Species | Taxom |
| Mycetophagidae Leach, 1815 | Hairy fungus beetle | 1 | Species | Taxom |
| Mymaridae Haliday, 1833 | Fairflies | 0 | Species | Taxom |
| Myrmeleontidae Latreille, 1802 | Ant lions | 2 | Species | Taxom |
| Nabidae Costa, 1852 | Damsel bugs | 1 | Species | Taxom |
| Nemopteridae Rambur, 1842 | Spoonwings | 1 | Species | Taxom |
| Nemouridae Newman, 1853 | Brown stoneflies | 1 | Species | Taxom |
| Nepidae Latreille, 1802 | Back-swimmer Water-boatmen | 2 | Species | Taxom |
| Nitidulidae Latreille, 1802 | Nitidules | 2 | Species | Taxom |
| Noctuidae Latreille, 1809 | Armyworms | 117 | Species | Taxom |
| Nogodinidae Melichar, 1898 | | 1 | Species | Taxom |
| Nolidae Hampson, 1894 | Hatted Caterpillars | 5 | Species | Taxom |
| Notodontidae Stephens, 1829 | Bag Shelter Moths | 10 | Species | Taxom |
| Notonectidae Latreille, 1802 | Back Swimmers | 4 | Species | Taxom |
| Nymphalidae Rafinesque, 1815 | Admirals | 31 | Species | Taxom |
| Oecanthidae (Blanchard, 1845) | Tree cricket | 3 | Species | Taxom |
| Oecophoridae Bruand, 1851 | Concealer Moths | 7 | Species | Taxom |
| Oedemeridae Latreille, 1810 | False Blister Beetle | 1 | Species | Taxom |
| Orussidae Newman, 1834 | Orussid wasps | 1 | Species | Taxom |
| Otitidae (Macquart, 1835) | Picture-winged flies | 1 | Species | Taxom |
| Oxycarenidae Stål, 1862 | | 1 | Species | Taxom |
| Pachygronthidae Stål, 1865 | | 1 | Species | Taxom |
| Pamphiliidae Cameron, 1890 | Leaf-rolling sawflies | 1 | Species | Taxom |
| Papilionidae Latreille, 1802 | Apollos | 7 | Species | Taxom |
| Pelecinidae Haliday, 1839 | Ancestral And Modern Pelecinid Wasps | 1 | Species | Taxom |
| Pentatomidae Leach, 1815 | Lesser shield bugs | 16 | Species | Taxom |
| Pergidae Rohwer, 1911 | Pergid flies | 1 | Species | Taxom |
| Perilampidae Latreille, 1809 | Perilampid waps | 1 | Species | Taxom |
| Perlidae (Latreille, 1802) | Common stoneflies | 9 | Species | Taxom |
| Perlodidae Klapálek, 1912 | Perlodid stoneflies | 3 | Species | Taxom |
| Petaluridae Needham, 1903 | Grayback dragonfly | 1 | Species | Taxom |
| Philopotamidae Stephens, 1829 | Finger Net caddisflies | 3 | Species | Taxom |
| Phlaeothripidae Uzel, 1895 | Thrips | 1 | Species | Taxom |
| Phoridae Curtis, 1833 | Coffin Flies | 1 | Species | Taxom |
| Phryganeidae (Leach, 1815) | Giant casemaker | 3 | Species | Taxom |
| Pieridae Duponchel, 1835 | Brimstones | 15 | Species | Taxom |
| Platygastridae Haliday, 1833 | Platygastrid wasps | 1 | Species | Taxom |
| Platystomatidae Schiner, 1862 | Picture-winged flies | 1 | Species | Taxom |
| Plutellidae Guenée, 1845 | Diamond-back moths | 1 | Species | Taxom |
| Podoscirtidae Saussure, 1878 | | 1 | Species | Taxom |
| Polycentropodidae Ulmer, 1903 | Tube Maker Caddisflies | 2 | Species | Taxom |
| Pompilidae Latreille, 1805 | Pompilid wasps | 4 | Species | Taxom |
| Potamanthidae Albarda, 1888 | Hacklegill mayflies | 1 | Species | Taxom |
| Prisopodidae Brunner von ..., 1893 | | 1 | Species | Taxom |
| Proctotrupidae Latreille, 1802 | Proctotrupid wasps | 1 | Species | Taxom |
| Psephenidae Lacordaire, 1854 | Water pennies | 0 | Species | Taxom |
| Pseudococcidae Heymons, 1915 | Mealy Bugs | 1 | Species | Taxom |
| Psocidae Samouelle, 1819 | Common bark louse | 2 | Species | Taxom |
| Psychidae Boisduval, 1828 | Bagmoths | 2 | Species | Taxom |
| Pteromalidae Dalman, 1820 | Pteromalid wasps | 1 | Species | Taxom |
| Pteronarcyidae Enderlein, 1909 | Giant stoneflies | 1 | Species | Taxom |
| Pterophoridae Zeller, 1841 | Plume Moths | 1 | Species | Taxom |
| Ptiliidae Heer, 1843 | Feather-wing beetles | 0 | Species | Taxom |
| Ptinidae Latreille, 1802 | Death-watch and Spider Beetles | 0 | Species | Taxom |
| Pyralidae Latreille, 1802 | Flour Moths | 24 | Species | Taxom |
| Pyrochroidae Latreille, 1807 | Cardinal beetles | 0 | Species | Taxom |
| Reduviidae Latreille, 1807 | Assassin and thread-legged bugs | 4 | Species | Taxom |
| Rhagionidae Latreille, 1802 | Snipe flies | 1 | Species | Taxom |
| Rhaphidophoridae Walker, 1869 | And Cave Weta | 1 | Species | Taxom |
| Rhopalidae Amyot & Serv..., 1843 | Rhopalid Bugs | 1 | Species | Taxom |
| Rhopalopsyllidae Oudemans, 1909 | Marsupial fleas | 1 | Species | Taxom |
| Rhyparochromidae Amyot & Serv..., 1843 | Dirt-colored Seed Bugs | 1 | Species | Taxom |
| Riodinidae Grote, 1895 | Metalmark Butterflies | 2 | Species | Taxom |
| Saturniidae Boisduval, 1837 | And Giant Silk Moths | 10 | Species | Taxom |
| Scarabaeidae Latreille, 1802 | Dung beetles | 35 | Species | Taxom |
| Scathophagidae Robineau-Des..., 1830 | Dung flies | 2 | Species | Taxom |
| Scelionidae Haliday, 1839 | Scelionid wasps | 1 | Species | Taxom |
| Scoliidae Leach, 1815 | Mammoth wasps | 2 | Species | Taxom |
| Sesiidae Boisduval, 1828 | Clear Wings | 11 | Species | Taxom |
| Silphidae Latreille, 1807 | Burying And Carrion Beetles | 7 | Species | Taxom |
| Simuliidae Newman, 1834 | Black flies | 1 | Species | Taxom |
| Siphlonuridae Banks, 1900 | Primitive Minnow Mayflies | 0 | Species | Taxom |
| Siricidae Billberg, 1820 | Horntail | 2 | Species | Taxom |
| Sphecidae Latreille, 1802 | Digger & Sand wasps | 3 | Species | Taxom |
| Sphingidae Latreille, 1802 | Hawk Moths | 16 | Species | Taxom |
| Staphylinidae Lameere, 1900 | Rove beetles | 9 | Species | Taxom |
| Stenopsocidae Pearman, 1936 | Narrow Barklice | 1 | Species | Taxom |
| Stratiomyidae Latreille, 1802 | Soldier flies | 1 | Species | Taxom |
| Stylopidae Kirby, 1813 | Strepsiptera | 1 | Species | Taxom |
| Syrphidae Latreille, 1802 | Drone flies | 33 | Species | Taxom |
| Tabanidae Latreille, 1802 | Breeze flies | 6 | Species | Taxom |
| Tachinidae (Robineau-Des..., 1830) | Bristle Flies | 3 | Species | Taxom |
| Taeniopterygidae Klapálek, 1905 | Taeniopterygid winter stoneflies | 3 | Species | Taxom |
| Tenebrionidae Latreille, 1802 | Darkling Beetle | 10 | Species | Taxom |
| Tenthredinidae Latreille, 1804 | Common sawflies | 33 | Species | Taxom |
| Tephritidae Newman, 1834 | Fruit flies | 4 | Species | Taxom |
| Termitidae Latreille, 1802 | Higher termites | 1 | Species | Taxom |
| Tetrigidae Rambur, 1838 | Groundhoppers | 6 | Species | Taxom |
| Tettigoniidae Krauss, 1902 | Bush crickets | 5 | Species | Taxom |
| Tineidae Latreille, 1810 | & Allies | 8 | Species | Taxom |
| Tingidae Laporte, 1832 | Lace bug | 2 | Species | Taxom |
| Tiphiidae Leach, 1815 | Flower wasps | 2 | Species | Taxom |
| Tipulidae Latreille, 1802 | Crane Flies | 4 | Species | Taxom |
| Tortricidae Latreille, 1803 | Bell Moths | 66 | Species | Taxom |
| Trichodectidae Kellogg, 1896 | | 1 | Species | Taxom |
| Trigonidiidae (Saussure, 1870) | And Ground Crickets | 2 | Species | Taxom |
| Trogidae (MacLeay, 1819) | Gnawer beetles | 1 | Species | Taxom |
| Veliidae Amyot & Serv..., 1843 | Broad-shouldered bugs | 1 | Species | Taxom |
| Vespidae Leach, 1815 | And Allies | 12 | Species | Taxom |
| Xiphydriidae Leach, 1819 | Wood wasps | 2 | Species | Taxom |
| Xyelidae Newman, 1835 | Sawfly | 1 | Species | Taxom |
| Yponomeutidae Stephens, 1829 | Ermine Moths | 2 | Species | Taxom |
| Zygaenidae Latreille, 1809 | Burnet Forester | 3 | Species | Taxom |
