Cresson, E. T. 1864. Descriptions of North American Hymenoptera in the collection of the Entomological Society of Philadelphia. Proceedings of the Entomological Society of Philadelphia 3:257-321.
Cresson, E. T. 1864. Descriptions of North American Hymenoptera in the collection of the Entomological Society of Philadelphia. Proceedings of the Entomological Society of Philadelphia 3:257-321.