Cresson, E. T., 1864, Descriptions of North American Hymenoptera, in the collection of the Entomological Society of Philadelphia (continued from page 196).

Cresson, E. T., 1864, Descriptions of North American Hymenoptera, in the collection of the Entomological Society of Philadelphia (continued from page 196)., Proceedings of the Entomological Society of Philadelphia 3, pp. 257-321

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