A comprehensive search was conducted to ascertain the fate of the weevils named and described by the early North American naturalist Thomas Say. The historical context of each of his weevil papers is given along with the approximate date of publication. At least 117 extant type specimens were located for 92 (possibly 98) of his 132 nominal species in museum collections in Berlin, Cambridge, Halle, and Stockholm. Supporting evidence for their authenticity is presented. Actions are taken to stabilize eight genus group names. Species names are fixed when reasonably sound taxonomic revisions are available. Primary homonyms found are Baridius sulcipennis Brisout, 1870 (not Heyden, 1868), and Lixus marginatus Say, 1832 (not Beck, 1817). Lectotypes are designated for Balaninus nasicus Say, 1832; B. rostratus Gyllenhaal, 1835; Cleonus trivittatus Say, 1832; Cryptorhynchus umbrosus Boheman, 1837; Liparus tessellatus Say, 1824; L. vittatus Say, 1824; Rhynchaenus constrictus Say, 1824; Rhynchites aeratus Say, 1831; Rhynchophorus immunis Say, 1832; R. placidus Say, 1832; R. venatus Say, 1832; and Tanymecus confusus Say, 1832. The holotype of B. sulcipennis Heyden is designated as neotype for Baridius transversus Say, 1832. Resurrected names are (formerly used names in square brackets) Curculio auctus Casey, 1910 [ante: C. nasicus auctt.]; Pseudobaris crenata (Boheman, 1836) [ante: Craptus undatus auctt.]; Aramigus durius (Germar, 1823) [ante: A. tessellatus auctt.]; Sphenophorus compressirostris Germar, 1823 [ante: S. germari Horn, 1873]; S. cultrirostris Gyllenhaal, 1838 [ante: S. compressirostris (Say, 1824)]; S. immunis (Say, 1832) and S. placidus (Say, 1832) [ante: S. venatus auctt.]; Dorytomus rufus (Say, 1832) [ante: Ellescus ephippiatus (Say, 1832)]; Cryptorhynchus umbrosus Boheman, 1837 [ante: C. obliquus auctt.]; and Tanymecus confertus Gyllenhaal, 1834 [ante: T. confusus auctt.]. New or reestablished combinations are Aracanthus tessellatus (Say, 1824) [from Aramigus Horn], Auleutes curtus (Say, 1832) [from Acanthoscelidius Hustache], Dorytomus rufus (Say, 1832) [from Ellescus Dejean], and Onychobaris undata (Say, 1832) [from Craptus Casey]. New or reestablished junior synonyms are Aramigus tessellatus pallidus Horn, 1876, Asynonychus santafecinus Lanteri, 1987, A. viridipallens Hustache, 1947, Eurymetopus chevrolati Voß, 1934, E. griseus Voß, 1934, and Pantomorus biseriatus Hustache, 1947 [all of Aramigus durius (Germar, 1823)]; Baridius sulcipennis Heyden, 1868, B. sulcipennis Brisout, 1870, and B. strenuus LeConte, 1869 [all of Baris transversa (Say, 1832)]; Balaninus nasicus Say, 1832 [of Curculio proboscideus Fabricius, 1775]; B. ordinatus Casey, 1910 [of Curculio auctus (Casey, 1910)]; Cryptorhynchus fuscatus LeConte, 1876 [of C. obliquus Say, 1832]; C. palmacollis Say, 1832 [of Rhyssomatus palmicollis (Say, 1832)]; Deracanthus pallidus Say, 1832 [of Aracanthus tessellatus (Say, 1824)]; Dorytomus squamosus LeConte, 1876 [of D. rufus<
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