| Acaenotus canus Melander, 1950 | |
| Belosta albicomula Kelsey, 1971 | American nailwort |
| Belosta albipilosa Hardy, 1944 | Singlenerve peperomia |
| Belosta pilosa Coquillett, 1902 | |
| Belosta scutulamacula Kelsey, 1971 | American nailwort |
| Belosta telfordi Kelsey, 1969 | American nailwort |
| Belosta termitophaga Kelsey, 1969 | American nailwort |
| Belosta viticolapennis Kelsey, 1969 | American nailwort |
| Brevitrichia addacifons Kelsey, 1969 | |
| Brevitrichia albanota Kelsey, 1971 | American nailwort |
| Brevitrichia arena Kelsey, 1971 | American nailwort |
| Brevitrichia argentaurba Kelsey, 1971 | American nailwort |
| Brevitrichia aspinosa Kelsey, 1969 | American nailwort |
| Brevitrichia badiclitella Kelsey, 1971 | American nailwort |
| Brevitrichia beameri Kelsey, 1969 | American nailwort |
| Brevitrichia boharti Kelsey, 1969 | American nailwort |
| Brevitrichia castanea Kelsey, 1969 | American nailwort |
| Brevitrichia coquilletti Kelsey, 1969 | American nailwort |
| Brevitrichia daileyi Kelsey, 1971 | American nailwort |
| Brevitrichia davisi Kelsey, 1969 | American nailwort |
| Brevitrichia dicksoni Kelsey, 1969 | American nailwort |
| Brevitrichia downeyi Kelsey, 1969 | American nailwort |
| Brevitrichia flocki Kelsey, 1969 | American nailwort |
| Brevitrichia forficicruxa Kelsey, 1971 | American nailwort |
| Brevitrichia granti Kelsey, 1974 | |
| Brevitrichia griffini Kelsey, 1969 | American nailwort |
| Brevitrichia griseola (Coquillett, 1900) | ⇒ Metatrichia griseola Coquillett, 1900 |
| Brevitrichia halli Kelsey, 1969 | American nailwort |
| Brevitrichia helenae James, 1938 | |
| Brevitrichia hodgdeni Kelsey, 1969 | American nailwort |
| Brevitrichia inferacanna Kelsey, 1971 | American nailwort |
| Brevitrichia insulana Cole, 1923 | |
| Brevitrichia kerni Kelsey, 1969 | American nailwort |
| Brevitrichia melanderi Kelsey, 1969 | American nailwort |
| Brevitrichia minuta Kelsey, 1969 | American nailwort |
| Brevitrichia miraloma Kelsey, 1971 | American nailwort |
| Brevitrichia nevada Kelsey, 1971 | American nailwort |
| Brevitrichia ordwayi Kelsey, 1969 | American nailwort |
| Brevitrichia pallida Kelsey, 1971 | |
| Brevitrichia palmacana Kelsey, 1971 | American nailwort |
| Brevitrichia piscifonta Kelsey, 1971 | American nailwort |
| Brevitrichia powelli Kelsey, 1974 | American nailwort |
| Brevitrichia schlingeri Kelsey, 1969 | American nailwort |
| Brevitrichia scitulaesca Kelsey, 1969 | American nailwort |
| Brevitrichia septispina Kelsey, 1971 | American nailwort |
| Brevitrichia timberlakei Kelsey, 1969 | American nailwort |
| Brevitrichia tomichi Kelsey, 1974 | |
| Brevitrichia wilcoxi Kelsey, 1971 | American nailwort |
| Caenotoides californica Hall, 1972 | |
| Caenotoides idahoensis Hall, 1972 | |
| Metatrichia bulbosus Osten Sacken, 1877 | |
| Metatrichia griseola Coquillett, 1900 | |
| Pseudatrichia albocincta Van Duzee, 1926 | Parish's yampah |
| Pseudatrichia atombomba Kelsey, 1969 | American nailwort |
| Pseudatrichia bakeri Kelsey, 1969 | American nailwort |
| Pseudatrichia barnesi Kelsey, 1969 | American nailwort |
| Pseudatrichia biacristerna Kelsey, 1969 | American nailwort |
| Pseudatrichia bryanti Kelsey, 1969 | American nailwort |
| Pseudatrichia bupennis Kelsey, 1969 | American nailwort |
| Pseudatrichia cajoni Kelsey, 1969 | American nailwort |
| Pseudatrichia cloudcrofti Kelsey, 1969 | American nailwort |
| Pseudatrichia cockerelli Kelsey, 1969 | American nailwort |
| Pseudatrichia concava Kelsey, 1969 | American nailwort |
| Pseudatrichia convexa Kelsey, 1969 | American nailwort |
| Pseudatrichia eaithales Kelsey, 1969 | American nailwort |
| Pseudatrichia evergreeni Kelsey, 1969 | American nailwort |
| Pseudatrichia garretti Kelsey, 1969 | American nailwort |
| Pseudatrichia gracilipennis Kelsey, 1969 | American nailwort |
| Pseudatrichia granti (Kelsey, 1974) | ⇒ Brevitrichia granti Kelsey, 1974 |
| Pseudatrichia howdeni Kelsey, 1969 | American nailwort |
| Pseudatrichia idahoensis Kelsey, 1971 | American nailwort |
| Pseudatrichia jamesi Kelsey, 1969 | American nailwort |
| Pseudatrichia leechi Kelsey, 1969 | American nailwort |
| Pseudatrichia melanderi Kelsey, 1969 | American nailwort |
| Pseudatrichia morlani Kelsey, 1969 | American nailwort |
| Pseudatrichia nordeni Kelsey, 1969 | American nailwort |
| Pseudatrichia parva Hardy, 1944 | Singlenerve peperomia |
| Pseudatrichia parvipennis Kelsey, 1969 | American nailwort |
| Pseudatrichia peromysci Kelsey, 1969 | American nailwort |
| Pseudatrichia rufitruncula Kelsey, 1971 | American nailwort |
| Pseudatrichia sabroskyi Kelsey, 1969 | American nailwort |
| Pseudatrichia saccharcupa Kelsey, 1969 | American nailwort |
| Pseudatrichia schlingeri Kelsey, 1971 | American nailwort |
| Pseudatrichia tomichi (Kelsey, 1974) | ⇒ Brevitrichia tomichi Kelsey, 1974 |
| Pseudatrichia toupeta Kelsey, 1969 | American nailwort |
| Pseudatrichia unicolor Coquillett, 1900 | |
| Scenopinus alatacteus Kelsey, 1969 | |
| Scenopinus albifasciata Hardy, 1944 | |
| Scenopinus albipilosus Kelsey, 1971 | American nailwort |
| Scenopinus aquelonius Kelsey, 1969 | American nailwort |
| Scenopinus aurantipalpus Kelsey, 1971 | American nailwort |
| Scenopinus barberi Kelsey, 1969 | American nailwort |
| Scenopinus beameri Hardy, 1944 | |
| Scenopinus bermudaensis Kelsey, 1971 | American nailwort |
| Scenopinus breviterminus Kelsey, 1969 | American nailwort |
| Scenopinus bryanti Kelsey, 1969 | American nailwort |
| Scenopinus butleri Kelsey, 1969 | American nailwort |
| Scenopinus cavifrons Kröber, 1937 | |
| Scenopinus chico Kelsey, 1969 | American nailwort |
| Scenopinus cochisei Kelsey, 1969 | American nailwort |
| Scenopinus cooki Kelsey, 1969 | American nailwort |
| Scenopinus cretatus Kelsey, 1969 | American nailwort |
| Scenopinus dietricki Kelsey, 1971 | American nailwort |
| Scenopinus electus Adams, 1904 | |
| Scenopinus estesi Kelsey, 1971 | American nailwort |
| Scenopinus fenestralis Linnaeus, 1758 | House windowfly |
| Scenopinus flandersi Kelsey, 1969 | American nailwort |
| Scenopinus foxi Kelsey, 1971 | American nailwort |
| Scenopinus glabrifrons Meigen, 1824 | Prostrate yellowcress |
| Scenopinus gossypius Kelsey, 1969 | American nailwort |
| Scenopinus hagai Kelsey, 1969 | American nailwort |
| Scenopinus howdeni Kelsey, 1969 | American nailwort |
| Scenopinus johnsoni Kelsey, 1971 | American nailwort |
| Scenopinus kuiterti Hardy, 1944 | |
| Scenopinus linsleyanus Kelsey, 1974 | American nailwort |
| Scenopinus masoni Kelsey, 1974 | American nailwort |
| Scenopinus mirabilis Adams, 1904 | |
| Scenopinus nidorcaupulus Kelsey, 1969 | American nailwort |
| Scenopinus nubilipes Say, 1829 | Scorpion's-tail |
| Scenopinus pecki Kelsey, 1969 | American nailwort |
| Scenopinus reciprocatus Kelsey, 1971 | American nailwort |
| Scenopinus serratus Kelsey, 1969 | American nailwort |
| Scenopinus transversus Kelsey, 1971 | American nailwort |
| Scenopinus undulafrons Kelsey, 1969 | American nailwort |
| Scenopinus valga Hardy, 1944 | |
| Scenopinus vockerothi Kelsey, 1971 | American nailwort |
| Scenopinus weemsi Kelsey, 1969 | American nailwort |
| Scenopinus werneri Kelsey, 1969 | American nailwort |
| Scenopinus whittakeri James, 1955 | |
