Pachymenes is a small but widely distributed Neotropical genus of potter wasps, it has been proposed that another Neotropical genus, Santamenes, be merged into Pachymenes.
References
Giordani Soika, A. 1990. Revisione degli Eumenidi neotropicali appartenenti ai generi Pachymenes Sauss., Santamenes n. gen., Brachymenes G. S., Pseudacaromenes G. S., Stenosigma G. S. e Gamma Zav. (Hymenoptera). Boll. Mus. Civ. Stor. Nat. Venezia 39: 71–172.