The East Asian psyllid Acizzia jamatonica (Kuwayama) develops mainly on mimosa or silk tree (Albizia julibrissin Durazz.; Fabaceae). First recorded from Europe in 2001, the psyllid was detected in the Nearctic Region at two locales in Georgia, U.S.A, in 2006. Our surveys of mimosa in the southeastern United States in 2007 and 2008 indicate that A. jamatonica is widespread. It is newly reported from Alabama (9 counties), Florida (6), North Carolina (3), South Carolina (12), and Tennessee (4); 19 additional counties are reported for Georgia. The known U.S. distribution of the psyllid is mapped, a taxonomic diagnosis and description are provided to facilitate its recognition in the Nearctic fauna, and notes are given on its seasonality and habits. Also provided are color photographs of an overwintered (dark) and summer (green) adult, eggs, fourth- and fifth-instar nymphs, and injury to mimosa leaflets.