| Ancylodiplosis bryanti Felt, 1913 | |
| Apagodiplosis papyriferae Gagne, 1967 | |
| Blaesodiplosis canadensis Felt, 1908 | |
| Blaesodiplosis crataegibedeguar Osten Sacken, 1878 | |
| Blaesodiplosis crataegifolia Felt, 1907 | |
| Blaesodiplosis venae Stebbins, 1910 | |
| Bremia americana Felt, 1914 | |
| Bremia borealis Felt, 1914 | |
| Bremia caricis Felt, 1907 | |
| Bremia filicis Felt, 1907 | Low philonotis moss |
| Bremia fitchii Felt, 1912 | |
| Bremia montana Felt, 1914 | |
| Bremia podophyllae Felt, 1907 | Low philonotis moss |
| Bremia sylvestris Felt, 1920 | |
| Bremia tristis Felt, 1914 | |
| Caryadiplosis venicola Gagne, 2008 | |
| Caryomyia aggregata Gagne, 2008 | Hickory Aggregate Gall Midge |
| Caryomyia albipilosa Gagne, 2008 | Hickory White-haired Gall Midge |
| Caryomyia ansericollum Gagne, 2008 | |
| Caryomyia antennata Felt, 1909 | |
| Caryomyia arcuata Gagne, 2008 | Hickory Sombrero Gall Midge |
| Caryomyia asteris Gagne, 2008 | Hickory Starburst Gall Midge |
| Caryomyia caryae Osten Sacken, 1832 | Hickory Sticky Globe Gall Midge |
| Caryomyia caryaecola (Osten Sacken, 1862) | ⇒ Caryomyia ansericollum Gagne, 2008 |
| Caryomyia cilidolium Gagne, 2008 | |
| Caryomyia conoidea Gagne, 2008 | |
| Caryomyia consobrina Felt, 1909 | |
| Caryomyia cucurbitata Gagne, 2008 | Hickory Pumpkin Gall Midge |
| Caryomyia cynipsea Osten Sacken, 1862 | |
| Caryomyia deflexipili Gagne, 2008 | |
| Caryomyia eumaris Gagne, 2008 | |
| Caryomyia flaticrustum Gagne, 2008 | Hickory Puff Tart Gall Midge |
| Caryomyia glauciglobus Gagne, 2008 | Hickory Blue-powder Gall Midge |
| Caryomyia levicrustum Gagne, 2008 | |
| Caryomyia leviglobus Gagne, 2008 | |
| Caryomyia marginata Gagne, 2008 | |
| Caryomyia purpurea Gagne, 2008 | Hickory Purple Gumdrop Gall Midge |
| Caryomyia recurvata Gagne, 2008 | |
| Caryomyia sanguinolenta Osten Sacken, 1862 | Hickory Smooth Gumdrop Gall Midge |
| Caryomyia shmoo Gagne, 2008 | |
| Caryomyia spiniglobus Gagne, 2008 | Hickory Spiny Ball Gall Midge |
| Caryomyia stellata Gagne, 2008 | Hickory Starry-base Gall Midge |
| Caryomyia striolacrustum Gagne, 2008 | |
| Caryomyia subulata Gagne, 2008 | Hickory Awl-shaped Gall Midge |
| Caryomyia tuberculata Gagne, 2008 | Hickory Bumpy Woody Gall Midge |
| Caryomyia tuberidolium Gagne, 2008 | |
| Caryomyia tubicola Osten Sacken, 1862 | Hickory Bullet Gall Midge |
| Caryomyia turbanella Gagne, 2008 | |
| Caryomyia turbinata Gagne, 2008 | |
| Caryomyia urnula Gagne, 2008 | Hickory Urn Gall Midge |
| Caryomyia viscidolium Gagne, 2008 | Hickory Sticky Ginger Jar Gall Midge |
| Cecidomyia acarivora (Felt, 1907) | ⇒ Feltiella occidentalis Felt, 1912 |
| Cecidomyia amyotii (Géhin, 1861) | ⇒ Sitodiplosis mosellana Géhin, 1857 |
| Cecidomyia annulipes (Walsh, 1864) | ⇒ Hartigiola annulipes Hartig, 1839 |
| Cecidomyia atricornis Walsh, 1864 | |
| Cecidomyia atriplicis (Townsend, 1893) | ⇒ Asphondylia atriplicis Townsend, 1893 |
| Cecidomyia atrocularis Walsh, 1864 | |
| Cecidomyia bisetosa Gagne, 1978 | |
| Cecidomyia brevispatula Gagne, 1978 | |
| Cecidomyia chaneyi Cockerell, 1927 | |
| Cecidomyia collinsoniae (Beutenmuller, 1908) | ⇒ Oligotrophidi collinsoniae Beutenmuller, 1908 |
| Cecidomyia crassulina (Cockerell, 1908) | ⇒ Rhopalomyia crassulina Cockerell, 1908 |
| Cecidomyia decemmaculata Walsh, 1864 | |
| Cecidomyia foliora (Russell & Ho..., 1908) | ⇒ Macrodiplosis erubescens Osten Sacken, 1862 |
| Cecidomyia fortunactus Gagne, 1978 | |
| Cecidomyia graminis (Fitch, 1861) | ⇒ Clinodiplosis graminis Fitch, 1861 |
| Cecidomyia grossulariae (Fitch, 1855) | ⇒ Oligotrophidi grossulariae Fitch, 1855 |
| Cecidomyia hageni Aldrich, 1905 | |
| Cecidomyia inaequalis (Stebbins, 1910) | ⇒ Asphondylia diervillae Felt, 1907 |
| Cecidomyia muscosa Stebbins, 1910 | |
| Cecidomyia neomexicana (Cockerell, 1896) | ⇒ Asphondylia neomexicana Cockerell, 1896 |
| Cecidomyia orbitalis Walsh, 1864 | |
| Cecidomyia ornata Say, 1824 | |
| Cecidomyia poculum Osten Sacken, 1862 | |
| Cecidomyia pontaniiformis T. D. A. Coc..., 1908 | |
| Cecidomyia potentillaecaulis (Stebbins, 1910) | ⇒ Neolasioptera potentillaecaulis Stebbins, 1910 |
| Cecidomyia reburrata Gagne, 1978 | |
| Cecidomyia reniformis Stebbins, 1910 | |
| Cecidomyia silvestrii Trotter, 1911 | |
| Cecidomyia sorghicola Coquillett, 1899 | |
| Cecidomyia squamulicola Stebbins, 1910 | |
| Cecidomyia stercoraria Rubsaamen, 1891 | |
| Cecidomyia strobiligemma (Stebbins, 1910) | ⇒ Rhopalomyia strobiligemma Stebbins, 1910 |
| Cecidomyia tergata Fitch, 1845 | |
| Cecidomyia thoracica (Fitch, 1845) | ⇒ Mycodiplosis thoracica Fitch, 1845 |
| Cecidomyia torreyi (Felt, 1925) | ⇒ Lasiopteridi torreyi Felt, 1925 |
| Cecidomyia tortilis (Gagne, 1978) | ⇒ Dasineura tortilis Bremi, 1847 |
| Cecidomyia urnicola (Osten Sacken, 1875) | ⇒ Dasineura urnicola Osten Sacken, 1875 |
| Cecidomyia vaccinii (Osten Sacken, 1862) | ⇒ Dasineura oxycoccana Johnson, 1899 |
| Cecidomyia verbesinae Beutenmüller, 1907 | |
| Chamaediplosis nootkatensis Gagne & Duncan, 1990 | |
| Coccidomyia erii (Felt, 1912) | ⇒ Rhopalomyia erii Felt, 1912 |
| Coccidomyia pennsylvanica Felt, 1911 | |
| Coccodiplosis ananasae Hardy, 1960 | Hawai'i peperomia |
| Contarinia acetosellae Rübsaamen, 1891 | Gall midge |
| Contarinia acuta Gagne, 1984 | Crenulate rhabdoweisia moss |
| Contarinia agrimoniae Felt, 1907 | Low philonotis moss |
| Contarinia albescentis Gagne, 1967 | |
| Contarinia albotarsa Felt, 1907 | |
| Contarinia ampelophila Felt, 1907 | Low philonotis moss |
| Contarinia baeri Prell, 1931 | European pine-needle midge |
| Contarinia balsamifera Felt, 1907 | Low philonotis moss |
| Contarinia bromicola Marikovskij ..., 1961 | Bromegrass seed midge |
| Contarinia castaneae Stebbins, 1910 | |
| Contarinia catalpae Comstock, 1881 | Catalpa midge |
| Contarinia cerasiphila Felt, 1911 | |
| Contarinia cerasiserotinae Osten Sacken, 1871 | |
| Contarinia citrina Osten Sacken, 1878 | Linden twig gall midge |
| Contarinia clarkei Felt, 1908 | |
| Contarinia clematidis Felt, 1908 | |
| Contarinia cockerelli Felt, 1918 | |
| Contarinia coloradensis Felt, 1912 | Pine bud gall midge |
| Contarinia constricta Condrashoff, 1961 | Douglas-fir needle midge |
| Contarinia cuniculator Condrashoff, 1961 | Douglas-fir needle midge |
| Contarinia divaricata Felt, 1908 | |
| Contarinia enceliae Felt, 1916 | |
| Contarinia excavationis Felt, 1907 | |
| Contarinia flavolinea Felt, 1908 | |
| Contarinia fraxini Felt, 1915 | |
| Contarinia geniculati Reuter, 1895 | Cocksfoot midge |
| Contarinia gossypii (Felt, 1908) | ⇒ Prodiplosis longifila Gagne, 1986 |
| Contarinia halliicola (Gagne, 1966) | ⇒ Contarinia wattsi Gagne, 1966 |
| Contarinia hudsonici Felt, 1908 | |
| Contarinia johnsoni Felt, 1909 | Grape blossom midge |
| Contarinia juniperina Felt, 1939 | Juniper midge |
| Contarinia maculipennis Felt, 1933 | Gall midge |
| Contarinia maculosa Felt, 1908 | |
| Contarinia nasturtii Kieffer, 1888 | Cabbage crowngall fly |
| Contarinia negundinis Gillette, 1890 | Box-elder bud gall midge |
| Contarinia obesa Felt, 1918 | |
| Contarinia opuntiae Felt, 1910 | |
| Contarinia oregonensis Foote, 1956 | Douglas-fir cone gall midge |
| Contarinia partheniicola Cockerell, 1900 | |
| Contarinia perfoliata Felt, 1908 | |
| Contarinia peritomatis Cockerell, 1913 | |
| Contarinia pseudotsugae Condrashoff, 1961 | Douglas-fir needle midge |
| Contarinia pyrivora Riley, 1886 | Gall midge |
| Contarinia quinquenotata F. Low, 1888 | Daylily gall midge |
| Contarinia racemi Stebbins, 1910 | |
| Contarinia rugosa Gagne, 1986 | Gall midge |
| Contarinia rumicis (Loew, 1850) | ⇒ Contarinia acetosellae Rübsaamen, 1891 |
| Contarinia sambucifoliae Felt, 1907 | Low philonotis moss |
| Contarinia schulzi Gagne, 1972 | Sunflower midge |
| Contarinia setigera Lintner, 1897 | |
| Contarinia sorghicola Coquillett, 1899 | Sorghum midge |
| Contarinia spiraeina Felt, 1911 | |
| Contarinia tecomae Felt, 1906 | |
| Contarinia texana Felt, 1921 | Gall midge |
| Contarinia thalactri Felt, 1907 | |
| Contarinia trifolii Felt, 1907 | Low philonotis moss |
| Contarinia truncata Felt, 1908 | |
| Contarinia vernalis Felt, 1908 | |
| Contarinia verrucicola Osten Sacken, 1875 | Linden Wart Gall Midge |
| Contarinia viatica Felt, 1908 | |
| Contarinia virginianiae Felt, 1906 | Chokecherry Midge |
| Contarinia viridiflava Felt, 1908 | |
| Contarinia washingtonensis Johnson, 1963 | Douglas-fir cone scale midge |
| Contarinia wattsi Gagne, 1966 | |
| Contarinia zauschneriae Felt, 1912 | |
| Coquillettomyia dentata Felt, 1908 | |
| Coquillettomyia lobata Felt, 1907 | |
| Coquillettomyia texana Felt, 1908 | |
| Cordylodiplosis molliterga Gagne, 1973 | |
| Ctenodactylomyia watsoni Felt, 1915 | |
| Diadiplosis floridana Felt, 1915 | |
| Diadiplosis koebelei Koebele, 1893 | Citrophilus mealybug parasite |
| Diadiplosis pseudococci Felt, 1933 | |
| Diadiplosis pulvinariae Felt, 1912 | |
| Epidiplosis sayi Felt, 1908 | |
| Glenodiplosis callipus Gagne, 1973 | |
| Gliaspilota glutinosa Osten Sacken, 1882 | Blue soldier fly |
| Gongrodiplosis latipes Felt, 1908 | |
| Halodiplosis sarcobati Felt, 1916 | |
| Harmandiola amisae Gagne, 1992 | |
| Harmandiola helena Felt, 1912 | |
| Harmandiola hudsoni Felt, 1907 | |
| Harmandiola reflexa Felt, 1913 | |
| Harmandiola stebbinsae Gagne, 1972 | |
| Homobremia insolens Felt, 1920 | |
| Kalodiplosis floridana Felt, 1915 | |
| Karshomyia acerina Felt, 1907 | |
| Karshomyia borealis Felt, 1920 | |
| Karshomyia caulicola Coquillett, 1895 | White-mold gall midge |
| Karshomyia curiosa Gagne, 1973 | |
| Karshomyia ectopia Gagne, 1973 | |
| Karshomyia insolens Felt, 1920 | |
| Karshomyia inusitata Gagne, 1973 | |
| Karshomyia mira Gagne, 1973 | |
| Karshomyia perissa Gagne, 1973 | |
| Karshomyia praecipua Gagne, 1973 | |
| Karshomyia quercina Felt, 1907 | |
| Karshomyia speciosa Felt, 1913 | |
| Karshomyia spinosa Felt, 1908 | |
| Karshomyia triangularis Felt, 1918 | |
| Karshomyia viburni Felt, 1907 | |
| Lobodiplosis pseudococci Felt, 1933 | Gall midge |
| Lobopteromyia filicis Felt, 1907 | |
| Lophodiplosis trifida Gagne, 1997 | Melaleuca gall midge |
| Macrodiplosis antennata Felt, 1908 | |
| Macrodiplosis claytoniae Felt, 1907 | |
| Macrodiplosis erubescens Osten Sacken, 1862 | Marginal Leaf Fold Gall Midge |
| Macrodiplosis flavoscuta Felt, 1907 | |
| Macrodiplosis majalis Osten Sacken, 1878 | |
| Macrodiplosis niveipila Osten Sacken, 1862 | |
| Macrodiplosis putrida Felt, 1912 | |
| Macrodiplosis q-oruca Walsh, 1925 | |
| Macrodiplosis venae Felt, 1914 | |
| Monarthropalpus flavus Schrank, 1776 | Boxwood leafminer |
| Obolodiplosis robiniae Haldeman, 1847 | Black Locust Gall Midge |
| Paradiplosis obesa Felt, 1907 | |
| Paradiplosis partheniicola | |
| Paradiplosis tumifex Gagne, 1978 | Balsam gall midge |
| Pilodiplosis helianthibulla Walsh, 1866 | |
| Pinyonia edulicola Gagne, 1970 | Pinyon spindle gall midge |
| Pitydiplosis packardi Felt, 1918 | |
| Planetella alexanderi Felt, 1921 | |
| Planetella americana Felt, 1907 | |
| Planetella atlantica Felt, 1908 | |
| Planetella caudata Felt, 1916 | |
| Planetella cincta Felt, 1921 | |
| Planetella coloradensis Cockerell, 1908 | |
| Planetella consobrina Felt, 1907 | |
| Planetella davisi Felt, 1921 | |
| Planetella dilatata Felt, 1921 | |
| Planetella fenestra Felt, 1915 | |
| Planetella fulva Felt, 1926 | |
| Planetella incisa Felt, 1921 | |
| Planetella johnsoni Felt, 1907 | |
| Planetella maxima Felt, 1921 | |
| Planetella modesta Felt, 1913 | |
| Planetella montana Felt, 1921 | |
| Planetella needhami Felt, 1907 | |
| Planetella palustris Felt, 1907 | |
| Planetella proteana Felt, 1914 | |
| Planetella pudica Felt, 1913 | |
| Planetella saturni Felt, 1914 | |
| Planetella shawi Felt, 1913 | |
| Platydiplosis nigricauda Gagne, 1973 | |
| Plectrodiplosis fascipennis Gagne, 1973 | |
| Prodiplosis citrulli Felt, 1935 | Cucurbit midge |
| Prodiplosis falcata Gagne, 1986 | |
| Prodiplosis floricola Felt, 1907 | |
| Prodiplosis longifila Gagne, 1986 | Bud midge |
| Prodiplosis morrisi Gagne, 1966 | Leafcurl midge |
| Prodiplosis myricae Beutenmüller, 1907 | |
| Prodiplosis platani Gagne, 1986 | |
| Prodiplosis vaccinii Felt, 1926 | Blueberry tip midge |
| Prodiplosis violicola Coquillett, 1900 | Violet gall midge |
| Putoniella gracilis Gagne, 1992 | |
| Resseliella aurata Felt, 1908 | |
| Resseliella californica Felt, 1914 | |
| Resseliella cincta Felt, 1918 | |
| Resseliella clavula Beutenmüller, 1892 | Dogwood club gall midge |
| Resseliella conicola Foote, 1956 | |
| Resseliella coryli Felt, 1907 | |
| Resseliella coryloides Foote, 1956 | |
| Resseliella hudsoni Felt, 1907 | |
| Resseliella liriodendri Osten Sacken, 1862 | Tulip Tree Leaf Spot Gall Midge |
| Resseliella maccus Loew, 1862 | |
| Resseliella perplexa Felt, 1908 | |
| Resseliella pinifoliae Felt, 1936 | |
| Resseliella radicis Felt, 1936 | |
| Resseliella silvana Felt, 1908 | |
| Resseliella tulipiferae Osten Sacken, 1862 | |
| Sequoiomyia taxodii Felt, 1916 | |
| Silvestriola apiphila Felt, 1907 | |
| Silvestriola cincta Felt, 1907 | |
| Stenodiplosis sorghicola Coquillett, 1899 | Durra gall midge |
| Tanaodiplosis androgynes Felt, 1908 | |
| Taxodiomyia cupressi Schweinitz, 1822 | |
| Taxodiomyia cupressiananassa Osten Sacken, 1878 | Cypress twig gall midge |
| Taxodiomyia taxodii Felt, 1911 | Cypress Leaf Gall Midge |
| Thaumadiplosis magnicauda Gagne, 1973 | |
| Thecodiplosis brachynteroides Osten Sacken, 1862 | |
| Thecodiplosis piniradiatae Snow & Mills, 1900 | Monterey-pine midge |
| Thecodiplosis piniresinosae Kearby, 1963 | Red pine needle midge |
| Thecodiplosis pinirigidae Packard, 1878 | Pine-needle gall fly |
| Thecodiplosis quercifolia | |
| Trogodiplosis flexuosa Gagne, 1985 | |
| Xylodiplosis longistylus Gagne, 1985 | |
| Youngomyia podophyllae Felt, 1907 | |
| Youngomyia quercina Felt, 1911 | |
| Youngomyia vernoniae (Felt, 1911) | ⇒ Youngomyia podophyllae Felt, 1907 |
| Zeuxidiplosis giardi Kieffer, 1896 | Gall midge |
