Saini, V. & Dey, D. (2022)

Description of Rhopalum (s. str.) gulmargense n. sp. with a key to the Indian species of the subgenus Rhopalum Stephens, 1829 s. str. (Hymenoptera: Crabronidae: Crabronini)

. Zootaxa, 5105 (1), 139–144.