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Two new species of Trichapion Wagner, T. baranowskii and T. santaritae, are described from Madera Canyon, near Tucson, Arizona. Six new species of Coelocephalapion Wagner are described: C. dilox (Mexico), C. goldilox (Costa Rica, Panama), C.johnsoni (Panama) with host Vatairea erythrocarpa Ducke (Fabaceae), C. nirostrum (Mexico), C. tellum (Texas, Mexico), and C. turnbowi (Mexico). Apionion opetion is described from Mexico. A closely similar species, Apionion bettyae (Kissinger), new combination, with probable host plant Lonchocarpus sp. (Fabaceae), is transferred from Trichapion.
A new genus, Sayapion Kissinger (type-species: Apion segnipes Say) is proposed for the 10 members of the Apion segnipes species group of Coelocephalapion Wagner orphaned when Coelocephalapion Wagner was raised to generic level (Kissinger, 1992). The species transferred from Apion to Sayapion as new combinations are as follows: Sayapion aponipes (Kissinger), S. arizonae (Fall), S. basale (Sharp), S. cinereum (Gerstaecker), S. laterale (Sharp), S. paranipes (Kissinger), S. pronipes (Kissinger), S. segnipes (Say), S. sublaterale (Kissinger), and S. terale (Kissinger).