Rhopalum gracile Wesmael, 1852

Rhopalum nigrinum von Kiesenwetter, 1849: 91 . Germany: Sachsen-Anstalt, Eisleben (syntype ♀ ♂).

Rhopalum gracile Wesmael, 1852: 592 . Switzerland: Genève area (Bruxelles) (holotype ♀).

Crabro kiesenwetteri A. Morawitz, 1866: 267 .

Corynopus simplicipes F. Morawitz, 1888: 291 . Uzbekistan: Zeravshan (Lectotype ♂).

Distribution: Nearctic and Palearctic regions.