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A new classification of the Geometrinae of the United States and Canada is presented, based largely on original investigations of male and female genitalia and larval characters….
revision, moths, Geometrinae, America
Ferguson, Douglas C.. 1969. "A revision of the moths of the subfamily Geometrinae of America North of Mexico (Insecta, Lepidoptera)." Bulletin of the Peabody Museum of Natural History , (29). https://elischolar.library.yale.edu/peabody_museum_natural_history_bulletin/29