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Ferris, C.D. & B.C. Schmidt 2010. Revision of the North American genera Tetracis Guenée and synonymization of Synaxis Hulst with descriptions of three new species (Lepidoptera: Geometridae: Ennominae). Magnolia Press Zootaxa 2347: 1–36

The genus Synaxis is synonymized with Tetracis. The thirteen North American species in genus Tetracis (some formerly in Synaxis) are discussed, including descriptions of three new species from western North America: Tetracis australis, T. montanaria, T. pallidata. Includes information on Tetracis australis, Tetracis barnesii, Tetracis cachexiata, Tetracis cervinaria, Tetracis crocallata, Tetracis formosa, Tetracis fuscata, Tetracis hirsutaria, Tetracis jubararia, Tetracis montanaria, Tetracis mosesiani, Tetracis pallidata, Tetracis pallulata