Sepedon mcphersoni, N. sp., key to north American Sepedon, groups in Sepedon s.s., and intra- and intergeneric comparison (Diptera : Sciomyzidae)

Sepedon mcphersoni, new species, from southern illinois, U.S.A., is describ ed and illustrated, and a key to the 20 North American species of Sepedon i s presented. The classification of the genus Sepedon and six related genera is discussed. All known species of Sepedon are classified in nine groups i ncluding the subgenus Parasepedon Verbeke 1950 as the Trichrooscelis group, the subgenus Mesosepedon Verbeke 1950 as the Dispersa group, and the genus Sepedomyia Verbeke 1950 as the Nasuta group. A character matrix of the gro ups of Sepedon and related genera is included. Publications on the life cyc les and/or immature stages of Sepedon and related genera are summarized.