Abstract
Abstract Periscelis (Periscelis) fugax sp. nov. is described and illustrated based on series of specimens from Portugal and the Czech Republic. It is probably widespread in Europe but has not been previously recognized from the closely related and externally very similar P. (P.) winnertzii Egger, 1862. The new species differs from P. winnertzii not only in structures of the male and female terminalia (illustrated) but also in colour pattern of pedicel and mesonotum. Morphology of the male and female terminalia is studied in detail in both these species and terminology of their structures is discussed and redefined. A new modern key to Palaearctic species of Periscelis (s. str.) species is constructed.
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