Pachybrachis armbrusti, Barney

Barney, Robert J., 2019, Key to All Sixty-Four Species of Pachybrachis Chevrolat (Coleoptera: Chrysomelidae: Cryptocephalinae) in the Eastern USA, The Coleopterists Bulletin 73 (1), pp. 85-96 : 87

11. Pronotal “M” moderate to heavy, black to reddish orange and sharply outlined, finely alutaceous and shiny, punctation sparse and widely separated; aedeagal beards forming long, dense, inwardly curving wisps; southeastern USA, Alabama to New Jersey ....... ......................... 2. P. armbrusti Barney

11 ʹ. Pronotal “M” moderate to heavy, black, punctation often strigose; aedeagal beards variable ........................................... 12