[1]
Ma, L. and Li, Q. 2012. Key to the Oriental species of Passaloecus Shuckard (Hymenoptera: Crabronidae), with descriptions of four new species from China. Zootaxa. 3329, 1 (May 2012), 41–50. DOI:https://doi.org/10.11646/zootaxa.3329.1.4.