Pachybrachis matthewi, Barney, 2018

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 : 91

72. Face, pronotum, pygidium, and elytra predominately whitish yellow; brown to black maculae on elytra often reduced to 3 small, lateral spots and 3 adjacent mid-elytral spots ................. 33. P. matthewi Barney

72 ʹ. Face, pronotum, pygidium, and elytra with nearly equal portions of brown to black and yellow ............................................ 73