Catalog of Hymenoptera in America north of Mexico - Krombein, Karl V. (Washington : Smithsonian Institution Press, 1979)
v. 1. Symphyta and Apocrita (Parasitica).--v. 2. Apocrita (Aculeata).--v. 3. Indexes.
"An outgrowth of ... Hymenoptera of America north of Mexico, synoptic catalog (1951) including the first and second supplements (1958, 1967)"
Keywords: Hymenoptera -- North America; Insects -- North America; Insetos -- América do Norte