Taxonomic notes on the genus Rhynchium Spinola (Hymenoptera: Vespidae: Eumeninae) from Vietnam, with a first checklist of the species worldwide

Abstract

The genus Rhynchium Spinola, 1806, is studied in Vietnam. Two species are recorded, namely, R. brunneum brunneum (Fabricius, 1793) and R. haemorrhoidale haemorrhoidale (Fabricius, 1775). A key to Vietnamese species of the genus is presented along with new distributional records. Twenty-one species and 36 subspecies are listed in a first checklist of species of the genus. New synonymy proposed in the present study is R. brunneum ceylonicum Giordani Soika, 1994, under the nominotypical subspecies R. b. brunneum (Fabricius, 1793).