Three new species and six new records of Scathophagidae (Diptera) from Japan, with a key to the Japanese genera

Twelve species in eight genera of Japanese Scathophagidae are reviewed. Of them, three species, namely Acerocnema incisa sp. nov., Gimnomera torikurai sp. nov., and Megaphthalmoides vittatus sp. nov., are described as new to science. The first two species were swept from communities of Corydalis flowers blooming in early spring. Six species in six genera are recorded from Japan for the first time: Chaetosa punctipes (Meigen), Cleigastra tibiella (Zetterstedt), Megaphthalma pallida (Fallen), Megaphthalmoides unilineatus (Zetterstedt), Microprosopa haemorrhoidalis (Meigen), and Spaziphora tomkovichi Ozerov. The genera Gimnomera, Chaetosa and Spaziphora are new records, and now a total of 13 genera are known to occur in Japan. A key to the Japanese genera is also provided, as well as keys to species of of Acerocnema and Megaphthalmoides.