Revision of the NearcticSilusa(Coleoptera, Staphylinidae, Aleocharinae)

Abstract

AbstractA revision of the Canadian species of the genusSilusaErichson is presented. In this contribution, we treat six species recently discovered in Canada, one of which is a new species from Alberta,Silusa langoriKlimaszewskisp. nov.The distribution records for two species are greatly expanded.Silusa californicaBernhauer is now known from Alaska, Minnesota, Alberta, Quebec, New Brunswick, and Nova Scotia (previous records: British Columbia, California).Silusa vesperisCasey is now known from Washington and British Columbia (previous record: California). For two other species, there are first records for Canada and one new United States state record.Silusa alternansSachse is now known from Quebec, New Brunswick, Nova Scotia, and New Hampshire (previous records: Georgia, New York), andSilusa densaFenyes is now known from Alberta (previous record: California).Silusa valensCasey is here considered as a synonym ofS. alternans.Silusa rutilansCasey andS. modicaCasey are confirmed to belong toLeptusaKraatz, and both are here considered as new synonyms ofLeptusa canonicaCasey.Silusa gracilisSachse andS. nanulaCasey are also confirmed to belong to the genusLeptusa. The following lectotypes are newly designated for species described on the basis of syntypes:S. alternansSachse andS. californicaBernhauer. New data are provided on the systematics, relationships, bionomics, and distribution for all Nearctic species of America north of Mexico. Diagnoses and illustrations of external and genital features are provided for all species, and the distribution of each is discussed and shown on maps. A key to the species occurring in Canada is presented.