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The East Asian buprestid Agrilus smaragdifrons Ganglbauer is reported for the first time in the Western Hemisphere. Specimens of this species taken from emerald ash borer ( A. planipennis Fairmaire) monitoring traps in New Jersey in 2015-2016 suggest establishment of this metallic wood-boring beetle in the northeastern United States. The earliest known record of A. smaragdifrons in the U.S. is based on a verifiable image found on BugGuide, from a specimen collected in Hudson County, New Jersey in June 2011. Diagnostic information and high-resolution images of the adult male, female, and the male aedeagus are provided to help facilitate the recognition of this adventive buprestid from other North American Agrilus. A summary of information about the host plant ( Ailanthus altissima), native distribution, and biology are given, and all known North American records are listed and mapped. [ABSTRACT FROM AUTHOR]