Cresson, E. T. 1928. The types of Hymenoptera in the Academy of Natural Science of Philadelphia other than those of Ezra T. Cresson Memoirs of the American Entomological Society 5:1-90
Cresson, E. T. 1928. The types of Hymenoptera in the Academy of Natural Science of Philadelphia other than those of Ezra T. Cresson Memoirs of the American Entomological Society 5:1-90