| Achalcus longicercus Osten Sacken, 1886 | |
| Achalcus melanotrichus Mik, 1878 | |
| Achradocera arcuata Van Duzee, 1924 | Fly |
| Amblypsilopus fuscinervis Van Duzee, 1926 | |
| Amblypsilopus scintillans Loew, 1861 | |
| Amblypsilopus unifasciatus Say, 1823 | |
| Argyra albicans Loew, 1861 | |
| Argyra calceata Loew, 1861 | |
| Argyra calcitrans Loew, 1861 | |
| Argyra currani Van Duzee, 1925 | Oregon yampah |
| Argyra fasciventris Van Duzee, 1930 | Parsley |
| Argyra ilonae Gosseries, 1988 | |
| Argyra nigricoxa Van Duzee, 1925 | Oregon yampah |
| Argyra obscura Van Duzee, 1925 | Oregon yampah |
| Argyra pilosicornis Walker, 1849 | |
| Argyra robusta Johnson, 1906 | California sandwort |
| Argyra sericata Van Duzee, 1925 | Oregon yampah |
| Argyra thoracica Van Duzee, 1925 | |
| Asyndetus harbeckii Van Duzee, 1914 | Bolander's yampah |
| Campsicnemus alexanderi Harmston & M..., 1966 | |
| Campsicnemus americanus Van Duzee, 1924 | Narrow-seeded yampah |
| Campsicnemus degener Wheeler, 1899 | Heartleaf groundcherry |
| Campsicnemus hirtipes Loew, 1861 | |
| Campsicnemus lipothrix Evenhuis, 2003 | |
| Campsicnemus montanus Harmston & K..., 1942 | |
| Campsicnemus scambus Fallen, 1823 | |
| Campsicnemus vanduzeei Curran, 1933 | |
| Campsicnemus wheeleri Van Duzee, 1923 | Lemmon's yampah |
| Chrysotimus delicatus Loew, 1861 | |
| Chrysotimus luteopalpus Curran, 1923 | |
| Chrysotus affinis Loew, 1861 | |
| Chrysotus auratus Loew, 1861 | |
| Chrysotus bellus Van Duzee, 1924 | Narrow-seeded yampah |
| Chrysotus caudatulus Van Duzee, 1932 | |
| Chrysotus caudatus (Van Duzee, 1924) | ⇒ Chrysotus caudatulus Van Duzee, 1932 |
| Chrysotus choricus Wheeler, 1890 | Coastal groundcherry |
| Chrysotus convergens Van Duzee, 1924 | Narrow-seeded yampah |
| Chrysotus currani Van Duzee, 1924 | Narrow-seeded yampah |
| Chrysotus dorsalis Van Duzee, 1924 | Narrow-seeded yampah |
| Chrysotus dubius (Van Duzee, 1924) | ⇒ Chrysotus hirtipes Van Duzee, 1924 |
| Chrysotus halteralis Van Duzee, 1924 | Narrow-seeded yampah |
| Chrysotus hastatus Van Duzee, 1924 | Narrow-seeded yampah |
| Chrysotus hirtipes Van Duzee, 1924 | Narrow-seeded yampah |
| Chrysotus johnsoni Van Duzee, 1924 | Narrow-seeded yampah |
| Chrysotus major Van Duzee, 1924 | Narrow-seeded yampah |
| Chrysotus neglectus Wiedemann, 1817 | |
| Chrysotus nigriciliatus Van Duzee, 1933 | Masterwort |
| Chrysotus obliquus Loew, 1861 | |
| Chrysotus palpiger Wheeler, 1890 | |
| Chrysotus parvulus Van Duzee, 1924 | Narrow-seeded yampah |
| Chrysotus picticornis Loew, 1862 | Jone's globemallow |
| Chrysotus sagittarius Van Duzee, 1924 | Narrow-seeded yampah |
| Chrysotus tibialis Van Duzee, 1924 | Narrow-seeded yampah |
| Chrysotus varipes Van Duzee, 1924 | Narrow-seeded yampah |
| Chrysotus wisconsinensis Wheeler, 1890 | Coastal groundcherry |
| Condostylus patibulatus | |
| Condylostylus caudatus Wiedemann, 1830 | |
| Condylostylus connectans Curran, 1942 | |
| Condylostylus inermis Loew, 1861 | |
| Condylostylus nigrofemoratus Walker, 1849 | |
| Condylostylus parvicauda Van Duzee, 1927 | |
| Condylostylus patibulatus Say, 1823 | |
| Condylostylus scaber | |
| Condylostylus sipho Say, 1823 | |
| Dactylomyia decora Aldrich, 1902 | |
| Dactylomyia lateralis Say, 1829 | |
| Dolichopus (Dolichopus) brevipennis Meigen, 1824 | Prostrate yellowcress |
| Dolichopus (Dolichopus) latipennis Fallen, 1823 | |
| Dolichopus (Dolichopus) lepidus Stæger, 1842 | |
| Dolichopus (Dolichopus) plumipes (Scopoli, 1763) | ⇒ Tachytrechus notatus Stannius, 1831 |
| Dolichopus (Dolichopus) remipes Wahlberg, 1839 | Milkwood |
| Dolichopus (Dolichopus) stenhammari Zetterstedt, 1843 | Harkness' flaxflower |
| Dolichopus abbreviatus Van Duzee, 1921 | Howell's yampah |
| Dolichopus absonus Van Duzee, 1921 | Howell's yampah |
| Dolichopus acuminatus Loew, 1861 | |
| Dolichopus adjacens Walker, 1849 | |
| Dolichopus adultus Van Duzee, 1921 | Howell's yampah |
| Dolichopus aequalis Van Duzee, 1921 | Howell's yampah |
| Dolichopus affinis Walker, 1849 | Largeflower milkweed |
| Dolichopus affluens Van Duzee, 1921 | Howell's yampah |
| Dolichopus agronomus Melander & B..., 1900 | |
| Dolichopus ainsliei Van Duzee, 1921 | Howell's yampah |
| Dolichopus alacer Van Duzee, 1921 | Howell's yampah |
| Dolichopus albiciliatus Loew, 1862 | Jone's globemallow |
| Dolichopus albicoxa Aldrich, 1893 | |
| Dolichopus amphericus Melander & B..., 1900 | |
| Dolichopus apheles Melander & B..., 1900 | |
| Dolichopus barbicauda Van Duzee, 1921 | Howell's yampah |
| Dolichopus bifractus Loew, 1861 | |
| Dolichopus blandus Van Duzee, 1921 | Howell's yampah |
| Dolichopus bolsteri Van Duzee, 1921 | Howell's yampah |
| Dolichopus boreus (Van Duzee, 1921) | ⇒ Dolichopus lamellipes Walker, 1849 |
| Dolichopus brevimanus Loew, 1861 | |
| Dolichopus brevipilosus Van Duzee, 1933 | Masterwort |
| Dolichopus bryanti Van Duzee, 1921 | Howell's yampah |
| Dolichopus burnesi Cresson, 1907 | Howell's yampah |
| Dolichopus calcaratus Aldrich, 1893 | |
| Dolichopus canadensis Van Duzee, 1921 | Howell's yampah |
| Dolichopus celeripes Van Duzee, 1921 | Howell's yampah |
| Dolichopus chrysostomus Loew, 1861 | |
| Dolichopus coercens Walker, 1849 | Largeflower milkweed |
| Dolichopus coloradensis Aldrich, 1893 | |
| Dolichopus comatus Loew, 1861 | |
| Dolichopus confinis (Walker, 1849) | ⇒ Argyra ilonae Gosseries, 1988 |
| Dolichopus contiguus Walker, 1849 | Largeflower milkweed |
| Dolichopus crenatus Osten Sacken, 1877 | Black hawthorn |
| Dolichopus cuprinus Wiedemann, 1830 | Shortstalk false bindweed |
| Dolichopus dakotensis Aldrich, 1893 | |
| Dolichopus dasypodus Coquillett, 1910 | |
| Dolichopus defectus Van Duzee, 1921 | Howell's yampah |
| Dolichopus delicatus Aldrich, 1922 | |
| Dolichopus demissus Van Duzee, 1921 | Howell's yampah |
| Dolichopus detersus Loew, 1866 | Scarlet globemallow |
| Dolichopus distinctus (Van Duzee, 1921) | ⇒ Dolichopus funditor Staeger, 1845 |
| Dolichopus eudactylus Loew, 1861 | |
| Dolichopus exclusus Walker, 1849 | Largeflower milkweed |
| Dolichopus finitus Walker, 1849 | Largeflower milkweed |
| Dolichopus flagellitenens Wheeler, 1890 | Coastal groundcherry |
| Dolichopus flaviciliatus Van Duzee, 1921 | Howell's yampah |
| Dolichopus flavicoxa Froggatt, 1911 | Howell's yampah |
| Dolichopus flavifacies Van Duzee, 1933 | Masterwort |
| Dolichopus flavilacertus Van Duzee, 1921 | Howell's yampah |
| Dolichopus footei Harmston, 1966 | Marigold pepper |
| Dolichopus fulvipes Loew, 1862 | Jone's globemallow |
| Dolichopus funditor Staeger, 1845 | |
| Dolichopus genuale Van Duzee, 1921 | |
| Dolichopus genualis Van Duzee, 1921 | Howell's yampah |
| Dolichopus gladius Van Duzee, 1921 | Howell's yampah |
| Dolichopus gratus Loew, 1861 | |
| Dolichopus groenlandicus Zetterstedt, 1843 | |
| Dolichopus harbercki | |
| Dolichopus incisuralis Loew, 1861 | |
| Dolichopus incongruus Wheeler, 1890 | Coastal groundcherry |
| Dolichopus indigenus Van Duzee, 1921 | Howell's yampah |
| Dolichopus johnsoni Aldrich, 1893 | |
| Dolichopus jugalis Tucker, 1911 | California eryngo |
| Dolichopus lamellipes Walker, 1849 | Largeflower milkweed |
| Dolichopus laticornis Loew, 1861 | |
| Dolichopus latipes Loew, 1861 | |
| Dolichopus latronis Van Duzee, 1921 | Howell's yampah |
| Dolichopus lobatus Loew, 1861 | |
| Dolichopus longimanus Loew, 1861 | |
| Dolichopus longipennis Loew, 1861 | |
| Dolichopus lundbecki Curran, 1923 | |
| Dolichopus luteipennis Loew, 1861 | |
| Dolichopus melanocerus Loew, 1864 | |
| Dolichopus nigricornis Meigen, 1824 | Prostrate yellowcress |
| Dolichopus nigrilineatus Van Duzee, 1924 | Narrow-seeded yampah |
| Dolichopus nigrimanus Van Duzee, 1921 | Howell's yampah |
| Dolichopus nodipennis Van Duzee, 1921 | Howell's yampah |
| Dolichopus obcordatus Aldrich, 1893 | |
| Dolichopus obsoletus Van Duzee, 1921 | Howell's yampah |
| Dolichopus occidentalis Aldrich, 1893 | |
| Dolichopus omnivagus Van Duzee, 1921 | Howell's yampah |
| Dolichopus orichalceus Gosseries, 1989 | |
| Dolichopus ornatipennis Van Duzee, 1921 | Howell's yampah |
| Dolichopus ovatus Loew, 1861 | |
| Dolichopus pachycnemus Loew, 1861 | |
| Dolichopus packardi Van Duzee, 1921 | Howell's yampah |
| Dolichopus palaestricus Loew, 1864 | |
| Dolichopus parvicornis Van Duzee, 1921 | Howell's yampah |
| Dolichopus penicillatus Van Duzee, 1921 | Howell's yampah |
| Dolichopus pilatus Van Duzee, 1921 | Howell's yampah |
| Dolichopus plumitarsis Fallen, 1823 | Long-legged fly |
| Dolichopus porphyrops Van Duzee, 1921 | Howell's yampah |
| Dolichopus pugil Loew, 1866 | Scarlet globemallow |
| Dolichopus ramifer Spencer, 1969 | |
| Dolichopus remus Van Duzee, 1921 | Howell's yampah |
| Dolichopus separatus Walker, 1849 | Largeflower milkweed |
| Dolichopus serratus Van Duzee, 1921 | Howell's yampah |
| Dolichopus setifer Loew, 1861 | |
| Dolichopus setosus Loew, 1862 | Jone's globemallow |
| Dolichopus shelfordi Curran, 1934 | California sweetcicely |
| Dolichopus sicarius Van Duzee, 1921 | Howell's yampah |
| Dolichopus sincerus Melander, 1900 | Mouseear cress |
| Dolichopus smicrus Meuffels & G..., 1999 | |
| Dolichopus soccatus Walker, 1849 | Largeflower milkweed |
| Dolichopus socius Loew, 1862 | Jone's globemallow |
| Dolichopus splendidus (Loew, 1861) | ⇒ Dolichopus contiguus Walker, 1849 |
| Dolichopus subciliatus Loew, 1864 | |
| Dolichopus tener Coquillett, 1902 | |
| Dolichopus terminalis Loew, 1866 | Scarlet globemallow |
| Dolichopus tetricus Loew, 1864 | |
| Dolichopus tonsus Loew, 1861 | |
| Dolichopus trisetosus Van Duzee, 1921 | Howell's yampah |
| Dolichopus umbrosus Van Duzee, 1921 | Howell's yampah |
| Dolichopus variabilis Loew, 1861 | |
| Dolichopus versutus Van Duzee, 1921 | Howell's yampah |
| Dolichopus vigilans Aldrich, 1893 | |
| Dolichopus virga Coquillett, 1910 | |
| Dolichopus virginiensis Van Duzee, 1921 | Howell's yampah |
| Dolichopus vittatus Loew, 1861 | |
| Dolichopus wheeleri Melander & B..., 1900 | Daggerpod |
| Dolichopus xanthocnemus Loew, 1864 | |
| Enlinia magistri Aldrich, 1932 | |
| Gymnopternus barbatulus Loew, 1861 | |
| Gymnopternus constrictus Robinson, 1964 | Smooth yellow vetch |
| Gymnopternus crassicauda Loew, 1861 | |
| Gymnopternus cuneicornis Robinson, 1964 | Smooth yellow vetch |
| Gymnopternus currani Van Duzee, 1930 | |
| Gymnopternus exilis Loew, 1861 | |
| Gymnopternus frequens Loew, 1861 | |
| Gymnopternus humilis Loew, 1864 | |
| Gymnopternus lividifrons Van Duzee, 1926 | Parish's yampah |
| Gymnopternus nigribarbus Loew, 1861 | |
| Gymnopternus nigricomus Robinson, 1964 | Smooth yellow vetch |
| Gymnopternus nigricoxa Van Duzee, 1924 | Narrow-seeded yampah |
| Gymnopternus obtusicauda Van Duzee, 1924 | Narrow-seeded yampah |
| Gymnopternus opacus Loew, 1861 | |
| Gymnopternus purpuratus Van Duzee, 1925 | |
| Gymnopternus scotias Loew, 1861 | |
| Gymnopternus spectabilis Loew, 1861 | |
| Gymnopternus subulatus Loew, 1861 | |
| Gymnopternus tristis Loew, 1864 | |
| Hercostomus celer (Meigen, 1824) | ⇒ Gymnopternus celer Meigen, 1824 |
| Hercostomus chetifer Walker, 1849 | |
| Hercostomus exilis Loew, 1861 | |
| Hercostomus unicolor Loew, 1864 | |
| Hydatostega browni Curran, 1930 | |
| Hydrophorus aestuum Loew, 1869 | Juniper globemallow |
| Hydrophorus alboflorens Walker, 1849 | |
| Hydrophorus amplectens Aldrich, 1911 | |
| Hydrophorus angustifacies Hurley, 1985 | Gray alder |
| Hydrophorus aquatilis Aldrich, 1922 | |
| Hydrophorus brevicauda Van Duzee, 1923 | Lemmon's yampah |
| Hydrophorus canities Van Duzee, 1923 | Lemmon's yampah |
| Hydrophorus chrysologus Walker, 1849 | |
| Hydrophorus eldoradensis Wheeler, 1899 | Heartleaf groundcherry |
| Hydrophorus extrarius Aldrich, 1911 | |
| Hydrophorus flavipennis Van Duzee, 1926 | Parish's yampah |
| Hydrophorus hirpicifer Hurley, 1985 | Gray alder |
| Hydrophorus manicatus Collin, 1935 | |
| Hydrophorus signifer (Coquillett, 1899) | ⇒ Hydrophorus signiferus Coquillett, 1899 |
| Hydrophorus signiferus Coquillett, 1899 | |
| Lamprochromus canadensis Van Duzee, 1917 | |
| Liancalus genualis Loew, 1861 | |
| Liancalus similis Aldrich, 1893 | |
| Medetera aberrans Wheeler, 1899 | Heartleaf groundcherry |
| Medetera abstrusa Thuneberg, 1955 | |
| Medetera aeneiventris Van Duzee, 1933 | Masterwort |
| Medetera apicalis (Zetterstedt, 1843) | ⇒ Medetera abstrusa Thuneberg, 1955 |
| Medetera bistriata Parent, 1929 | |
| Medetera canadensis Bickel, 1985 | |
| Medetera crassivenis Curran, 1928 | |
| Medetera gaspensis Bickel, 1985 | |
| Medetera jacula Fallen, 1823 | |
| Medetera maura Adams, 1904 | Heartleaf groundcherry |
| Medetera neomelancholia Bickel, 1985 | |
| Medetera nova Van Duzee, 1919 | Gairdner's yampah |
| Medetera signaticornis Loew, 1857 | |
| Medetera veles Loew, 1861 | |
| Medetera vidua Wheeler, 1899 | Heartleaf groundcherry |
| Medetera vittata Van Duzee, 1919 | Gairdner's yampah |
| Medetera vockerothi Bickel, 1985 | |
| Mesorhaga flavipes Van Duzee, 1932 | |
| Micromorphus minimus Van Duzee, 1925 | |
| Microphor obscurus Coquillett, 1903 | |
| Microphorus isommatus (Melander, 1928) | ⇒ Microphor isommatus Melander, 1927 |
| Nematoproctus cylindricus Van Duzee, 1924 | |
| Nepalomyia dilaticosta Runyon & Hurley, 2003 | |
| Nepalomyia nigricornis Van Duzee, 1914 | |
| Neurigona aestiva Van Duzee, 1913 | Bolander's yampah |
| Neurigona aldrichii Van Duzee, 1913 | Bolander's yampah |
| Neurigona australis Van Duzee, 1913 | Bolander's yampah |
| Neurigona carbonifer Loew, 1869 | |
| Neurigona ciliata Van Duzee, 1913 | Bolander's yampah |
| Neurigona disjuncta Van Duzee, 1913 | Bolander's yampah |
| Neurigona lateralis Say, 1829 | |
| Neurigona maculata Van Duzee, 1913 | Bolander's yampah |
| Neurigona nitida Van Duzee, 1913 | Bolander's yampah |
| Neurigona pectoralis Van Duzee, 1913 | Bolander's yampah |
| Neurigona perbrevis Van Duzee, 1913 | Bolander's yampah |
| Neurigona tenuis Loew, 1864 | |
| Parasyntormon emarginatum Wheeler, 1899 | Heartleaf groundcherry |
| Pelastoneurus abbreviatus Loew, 1864 | |
| Pelastoneurus kansensis Aldrich, 1894 | |
| Pelastoneurus laetus Loew, 1861 | |
| Pelastoneurus lugubris Loew, 1861 | Long-legged fly |
| Pelastoneurus proximus Aldrich, 1904 | |
| Pelastoneurus vagans Loew, 1861 | |
| Plagioneurus univittatus Loew, 1857 | Desert globemallow |
| Rhaphium calcaratum Van Duzee, 1928 | Parish's yampah |
| Rhaphium canadense Curran, 1924 | |
| Rhaphium caudatum Van Duzee, 1926 | Parish's yampah |
| Rhaphium dubium Van Duzee, 1922 | |
| Rhaphium effilatum Wheeler, 1899 | |
| Rhaphium elegantulum Meigen, 1824 | |
| Rhaphium fascipes Meigen, 1824 | |
| Rhaphium femoratum Van Duzee, 1922 | |
| Rhaphium impetuum (Curran, 1926) | ⇒ Rhaphium lugubre Loew, 1861 |
| Rhaphium insolitum Curran, 1926 | |
| Rhaphium lugubre Loew, 1861 | |
| Rhaphium melampus Loew, 1861 | |
| Rhaphium nudum Van Duzee, 1924 | |
| Rhaphium ornatum Van Duzee, 1923 | |
| Rhaphium palpale Curran, 1926 | |
| Rhaphium punctitarse Curran, 1924 | |
| Rhaphium rotundiceps Loew, 1861 | |
| Rhaphium signiferum Osten Sacken, 1878 | |
| Rhaphium subarmatum Curran, 1924 | |
| Rhaphium vanduzeei Curran, 1926 | |
| Scellus amplus Curran, 1923 | |
| Scellus exustus Walker, 1852 | |
| Scellus spinimanus Zetterstedt, 1843 | |
| Sciapus bicolor Loew, 1861 | |
| Sciapus delicatus Walker, 1849 | |
| Sciapus scintillans Loew, 1861 | |
| Sciapus tener Loew, 1862 | |
| Sciapus unifasciatus Say, 1823 | |
| Sciapus wiedemanni Fallen, 1823 | |
| Sympycnus brevipes Van Duzee, 1933 | Masterwort |
| Sympycnus lineatus Loew, 1861 | |
| Sympycnus longinervis Van Duzee, 1932 | |
| Sympycnus pectoralis Townsend, 1917 | Masterwort |
| Syntormon palmare Loew, 1864 | |
| Syntormon tricoloripes Curran, 1923 | |
| Systenus eucercus Steyskal, 1970 | Littleleaf buckbrush |
| Tachytrechus ammobates Haliday, 1851 | |
| Tachytrechus binodatus Loew, 1866 | Scarlet globemallow |
| Tachytrechus consobrinus Haliday, 1851 | |
| Tachytrechus laticrus Van Duzee, 1918 | Common yampah |
| Tachytrechus notatus Stannius, 1831 | |
| Tachytrechus vorax Loew, 1861 | |
| Telmaturgus parvus Van Duzee, 1942 | |
| Thinophilus magnipalpus Van Duzee, 1926 | Parish's yampah |
| Thrypticus comosus Van Duzee, 1915 | Bolander's yampah |
| Xanthochlorus helvinus Loew, 1861 | |
