Lopes, R. B., and F. B. Noll. “Notes on the Neotropical Zethus Fabricius, 1804 (Hymenoptera, Vespidae, Eumeninae) With the Description of Two New Species from Brazil”. Zootaxa, vol. 3784, no. 2, Mar. 2014, pp. 179–186, doi:10.11646/zootaxa.3784.2.7.