Burks, B. D., and K. V. Krombein. 1979. Catalog of Hymenoptera in America north of Mexico. in: Catalog of Hymenoptera in America north of Mexico. Volume 1, Symphyta and Apocrita (Parastica). Smithsonian Institution Press,Washington DC. xvi+1198 pp..
Burks & Krombein 1979
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