This paper describes a new species, Mataeopsephus taiwanicus and redescribes a recorded species M. esakii (Nakane). The difference between M. taiwanicus n. sp. and its allied species, M. japonicus (Matsumura) is also discussed.
臺灣產扁泥蟲科Mataeopsephus esakii(Nakane)發表時僅根據一隻雄性標本(Holotype),且無外部形態之標示;作者於模式標本產地及其鄰近地區採獲多隻此蟲標本,並於本文中重新描述外部形態及其生殖器,以補過去記述之不足。同時,記錄本科內另一新種M. taiwanicus並比較其與類似種類M. japonicus(Matsmura)間之差異。