Abstract
AbstractNine species ofCeromyaRobineau-Desvoidy (Diptera: Tachinidae: Siphonini) are recognized in the Nearctic region, including four new species, and one described species known previously only from the Palearctic region. The species are arranged into three species groups, with each group hypothesized to be monophyletic and each containing extralimital members. The three species groups and nine Nearctic species are as follows: thebicolor-group withC.bicolor(Meigen) (a Holarctic species newly recorded from the Nearctic region); theflaviseta-group withC.Ontario(Curran) andC.palloris(Coquillett); and theamericana-group withC.americana(Townsend),C.ballisp.nov. (type-locality Masham Township, Quebec, Canada),C.elyii(Walton),C.flavasp.nov. (type-locality Masham Township, Quebec, Canada),C.orienssp.nov. (type-locality Masham Township, Quebec, Canada), andC.occidentalissp.nov. (type-locality Lakelse Lake, British Columbia, Canada). Thebicolor-group has an Old World – Nearctic distribution, theflaviseta-group has an European–Nearctic distribution, and theamericana-group has a Neotropical–Nearctic distribution. Adults of the nine Nearctic species ofCeromyaare keyed and described, known hosts are listed (including corrections to published records), distributions are mapped, and taxonomically useful features are illustrated.
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