V. Saini and D. Dey, “First record of subgenus Corynopus Lepeletier and Brullé, 1835 (Genus Rhopalum Stephens, Hymenoptera: Crabronidae: Crabronini) from India: a new species and a key to Asian species of the subgenus”, Zootaxa, vol. 5507, no. 3, pp. 467–477, Sep. 2024.