1. (DRS) Systematic Entomology Laboratory, Agricultural Research Service, U. S. Department of Agriculture, c/o National Museum of Natural History, Smithsonian Institution, P.O. Box 37012, MRC 168, Washington, DC, USA 20013-7012 (e-mail: sawfly2@aol.com)
2. (GSW) USDA, ARS, Invasive Plant Research Laboratory, Ft. Lauderdale, FL 33314, USA (e-mail: greg.wheeler@ars.usda.gov)
3. (AFS-R, FM, MG, CC) Fundación para el Estudio de Especies Invasivas (FUEDEI), Hurlingham, Buenos Aires, Argentina; AFS-R also at Consejo Nacional de Infestigaciones Cientificas y Técnicas (CONICET), Buenos Aires, Argentina