The species and genera of the family Trogositidae in America north of Mexico are revised. Two subfamilies are recognized: Peltinae and Trogositinae. The Peltinae include: Calitys Thomson (2 species), Eronyxa Reitter (3 species), Ostoma Laicharting (3 species), Grynocharis Thomson (2 species), Lophocateres Olliff (1 species), and Thymalus Latreille (1 species). The Trogositinae include: Nemosoma Latreille (5 species), Cylidrella Sharp (1 species), Corticotomus Sharp (6 species), Euschaefferia Leng (2 species), Airora Reitter (3 species), Temnochila Westwood (10 species), and Tenebroides Piller and Mitterpacher (18 species). Pseudocotomus Schaeffer is placed in synonymy with Euschaefferia Leng and Parafilumis Casey with Corticotomus Sharp. New species are Temnochila omolopha from Arizona and New Mexico and Temnochila rhyssa from California and Idaho. Synonymies, keys, descriptions, collecting and locality data, and illustrations are included. A checklist places all the species and genera in the proposed classification. Interpretation of relationships of the genera and species is included. The North American taxa are associated with the trogositid taxa from other parts of the world, and with groups within the other families of Cleroidea. Relationships among the taxa are postulated. The inclusion of peltines and trogositines in a single family is upheld.

Eleven genera and 70 species of West Indian Alleculidae are revised. All known taxa of the family from the Bahama Islands, the Greater and Lesser Antilles, and the Cayman Islands are included. Five new genera (Parahymenorus, Latacula, Notacula, Obesacula, and Punctacula) are described and three genera are recorded from the West Indies for the first time (Cteisa, Pseudocistela, and Allecula). All five of the described subgenera of Lobopoda are recorded from the region, Glabrilobopoda for the first time. Forty-seven new species and one new subspecies are described in the genera Pseudocistela, Lobopoda, Allecula, Hymenorus, Parahymenorus, Latacula, Notacula, Obesacula, and Punctacula. Cistelopsis striatus Pic is transferred to the genus Hymenorus.Keys to the genera, subgenera, species, and subspecies are presented. All taxa are described or redescribed and major diagnostic characters are illustrated. Habitus illustrations are included for each genus. A zoogeographic discussion of the taxa, including distributional tables, is presented.

The Saltusaphidinae, or sedge aphids, as here understood consists of the following 49 species: Allaphis daviaulti (Quednau), Allaphis thripsoides (Hille Ris Lambers), Allaphis utahensis (Knowlton and Hall), Allaphis verrucosa (Gillette), Iziphya albipes Richards, Iziphya americana (Baker), Iziphya austriaca BÖrner, Iziphya brevipes Richards, Iziphya bufo (Walker), Iziphya flabella (Sanborn), Iziphya fungifera (Ossiannilsson), Iziphya grandipes Richards, Iziphya ingegardae Hille Ris Lambers, Iziphya leegei (BÖrner), Iziphya maculata Nevsky, Iziphya meridionalis (Hille Ris Lambers and v. d. Bosch), Iziphya nigriceps Richards, Iziphya oettingenii Quednau, Iziphya punctatella Richards, Iziphya spenceri Richards, Iziphya umbella Richards, Iziphya variabilis Quednau, Iziphya vittata Richards, Saltusaphis iberica (BÖrner), Saltusaphis scirpa Theobald, Sminthuraphis ulrichi Quednau, Stenaphis bodenheimeri (Hille Ris Lambers), Stenaphis elongata (Baker), Subsaltusaphis aquatalis (Ossiannilsson), Subsaltusaphis canadensis new species, Subsaltusaphis flava (Hille Ris Lambers), Subsaltusaphis intermedia (Hille Ris Lambers), Subsaltusaphis lambersi (Quednau), Subsaltusaphis maritima (Hille Ris Lambers), Subsaltusaphis ornata (Theobald), Subsaltusaphis pallida (Hille Ris Lambers), Subsaltusaphis paniceae (Quednau), Subsaltusaphis picta (Hille Ris Lambers), Subsaltusaphis rossneri (BÖrner), Subsaltusaphis virginica (Baker), Subsaltusaphis wanica (Hottes and Frison), Thripsaphis ballii (Gillette), Thripsaphis brevicornis Ossiannilsson, Thripsaphis caespitosae Ossiannilsson, Thripsaphis gelrica Hille Ris Lambers, Thripsaphis longisetis new species, Trichocallis cyperi (Walker), Trichocallis ossiannilssoni (Hille Ris Lambers), and Peltaphis hottesi Frison and Ross. Keys to genera and species and notes on the distribution of each species are given. Except for Iziphya leegei, which feeds on Juncus spp., all of the species breed on the Cyperaceae. A host index has been compiled from the material studied and the literature cited.

Thirty species of the genus Lygocoris Reuter known to occur in Canada and Alaska are reviewed. Lygocoris confusus (Knight) is considered to be a synonym of L. contaminatus (Fallen), communis var. novascotiensis (Knight) is a synonym of communis (Knight), caryae var. subfuscus (Knight) is a synonym of caryae (Knight), and canadensis var. binotatus (Knight) is a synonym of canadensis (Knight). The species considered are: pabulinus (Linnaeus), lucorum (Meyer), alni (Knight), artricallus Kelton, atritylus (Knight), belfragii (Reuter), canadensis (Knight), caryae (Knight), clavigenitalis (Knight), communis (Knight), contaminatus (Fallen), fagi (Knight), geneseensis (Knight), hirticulus (Van Duzee), inconspicuus (Knight), invitus (Say), johnsoni (Knight), knighti Kelton, laureae (Knight), omnivagus (Knight), ostryae (Knight), parrotti (Knight), piceicola Kelton, quercalbae (Knight), semivittatus (Knight), tiliae (Knight), univittatus (Knight), viburni (Knight), vilticollis (Reuter), and walleyi Kelton.A key to species, brief redescriptions, illustrations of species and male claspers, distribution maps, and host plants are included. A list of the remaining 10 species known from the United States is appended.