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A three-year survey of Wisconsin Mordellidae (Coleoptera) encompassing a compilation of data from literature records and local collections as well as field work including trapping, hand-collecting, and rearing yielded 68 species comprising 14 genera in three tribes. Sixty-three species (92% of Wisconsin fauna) represent new state species records, not previously recorded from the state in the literature. Plant-associations and state-specific temporal and spatial distribution data for larvae and adults are noted as available. Distributional records suggest 16 additional species and one additional genus are likely to occur in Wisconsin.
In an attempt to more consistently apply generic concepts, 13 species of Mordellidae are transferred to different genera. Mordellistena bihamata (Melsheimer) and Mordellistena discolor (Melsheimer) are transferred to Falsomordellistena Ermisch, 1941, while 11 species (Mordellistena ancilla LeConte, Mordellistena floridensis Smith, Mordellistena guttulata Helmuth, Mordellistena impatiens LeConte, Mordellistena infima LeConte, Mordellistena lecontei Ermisch, Mordellistena minutalis Liljeblad, Mordellistena nigricans Melsheimer, Mordellistena parva Liljeblad, Mordellistena semiusta LeConte, and Mordellistena testacea Blatchley) are transferred to Mordellina Schilsky, 1908. Two species, Mordellistena rufa Liljeblad and Mordellina ustulata (LeConte), are proposed as junior synonyms of Mordellina ancilla (LeConte).