Biosystematic studies of Ceylonese wasps, XIX : natural history notes in several families (Hymenoptera : Eumenidae, Vespidae, Pompilidae, and Crabronidae) / Karl V. Krombein (Smithsonian contributions to zoology ; no. 515)
Biosystematic studies of Ceylonese wasps, XIX : natural history notes in several families (Hymenoptera : Eumenidae, Vespidae, Pompilidae, and Crabronidae) / Karl V. Krombein