Abstract
In reviewing the nomenclature of genus-group names of the Chrysomelinae of the Americas, we uncovered six issues that we resolve here: (1) We explain priority between Stilodes and Leptinotarsa. Both were described in the same work: Chevrolat, 1836. In synonymizing the two genera, Flowers (2004) became the First Reviser and gave priority to Stilodes. We restore genus Leptinotarsa Chevrolat, 1836 as distinct from Stilodes Chevrolat, 1836. (2) The work in which Phaedon Megerle von Mühlfeld, 1823 was described is suppressed for the purposes of zoological nomenclature, making the next person to use the name, Latreille, 1829, the valid authority for Phaedon. (3) Euparocha Dejean, 1836 is a nomen nudum, and while Motschulsky likely intended to keep Dejean's spelling, Euparochia Motschulsky, 1860 is the correct original spelling. (4) Lioplacis Agassiz, 1846 is an unjustified emendation of Leioplacis Chevrolat, 1843, and Lioplacis Chevrolat is a subsequent usage of the unjustified emendation. Lioplacis is not in prevailing usage, therefore Leioplacis Chevrolat, 1843 remains the correct original spelling. (5) The accent on Dr Juan Brèthes' name is often incorrect or missing. Brèthes described Henicotherus in volume 32 of the Revista Chilena de Historia Natural. Volume 32 claims it was published in 1928 but was published in 1929. The authority for Henicotherus is therefore Brèthes, 1929. (6) The authority previously known only as "Demay", 1838 refers to Dr Aloysius François De Mey (1793-1870); we provide a short biography, portrait, and updated list of the species described by De Mey, 1838.