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The New World genus Dynastes reaches its northernmost extent in the United States with two species, Dynastes grantii and D. tityus (Linnaeus), the latter of which is widespread in eastern United States, including Virginia. Notes on the biology and distribution of D. tityus in Virginia are presented, along with observations on their feeding and mating behaviors on green ash trees (Fraxinus pennsylvanica Marshall) in Southampton County during the summer of 2019. The apparent dependence on ash trees of both species of American Dynastes that occur north of Mexico for attracting and locating mates is briefly discussed in light of their possible endangerment due to the ever-expanding range of the invasive Emerald Ash Borer, Agrilus planipennis Fairmaire. [ABSTRACT FROM AUTHOR]