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Animalia | Arthropoda | Insecta | Diptera | Athericidae and Atrichops hesperius and Naturalists--Colorado and Animalia | Arthropoda | Insecta | Diptera | Athericidae and Animalia | Arthropoda | Insecta | Diptera | Athericidae and Animalia | Arthropoda | Insecta | Diptera | Athericidae of Florissant Fossil Beds National Monument (Colo.) and Florissant Fossil Beds National Monument (Colo.)
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