Taxonomy of the genus Epsilon from China, with a new species and an updated key to the Oriental species (Hymenoptera, Vespidae, Eumeninae)

A new species of potter wasps, Epsilon similimanasicum sp. nov. is described and illustrated from Zhejiang, China. The holotype specimen of Epsilon subfistulosum (Wickwar, 1908) was examined and based on the characters of the type specimen, it is transferred from the genus Epsilon de Saussure to the genus Pararrhynchium de Saussure, as Pararrhynchium subfistulosum comb. nov. In addition, an updated key to the Oriental species of Epsilon is provided.