American Insects, Order Hymenoptera
Many experts in ants, bees, and wasps have provided me help over the years. These include John S. Ascher, Řistein Berg, Craig Brabant, Gavin Broad, Matthias Buck, Kelsey J.R.P. Byers, Bob Carlson, James M. Carpenter, Leopoldo Castro, Ben Coulter, Libor Dvořák, Eric Eaton, Charlie Eiseman, Nick Fensler, Paul Hanson, Ross Hill, Heather Holm, Kamil Holy, Susanna H., Michael Huber, Lynn Kimsey, Victor Kolyada, Jongok Lim, William Mackay, Paul Marsh, Michael Ohl, James Pitts, Wojciech Pulawski, Donald L. J. Quicke, Claus Rasmussen, Christian Schmid-Egger, Michael Sharkey, Scott R. Shaw, Dave Smith, Gordon C. Snelling, Eckart Stolle, Camille Thirion, James C. Trager, Gergely Várkonyi, Richard Vernier, Cecilia Waichert, George Waldren, Christopher M. Wilson, Harmut Wisch, Ken Wolgemuth, Matt Yoder, Jeong Yoo, and Bob Zuparko.
In developing the species pages I have mined a number of scholarly articles old and new, and these are listed in the Works Consulted page for Hymenoptera.
Above all, I want to thank my many friends and colleagues at the Bugguide.net website, and at inaturalist, who help with IDs, provide stimulating conversation about hexapods, and mutual support. Many of these are listed in the overall Acknowledgments page for the American Insects site.