Pachybrachis picturatus, (Germar)

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 : 86

6. Dark dorsal pattern weak, lateral elytral vitta essentially absent, reduced to humeral spot; keel of median lobe short, basal slope steeply inclined, distal slope gradually inclined to base of nodule, positioned on ventral surface within weakly sclerotized field ................ .................... 45. P. picturatus (Germar)

6 ʹ. Dark pattern of dorsum strong, lateral elytral vitta long, including humerus, weakly connected to or detached from inwardly curved subapical macula; keel of median lobe long, basal slope gradually inclined, distal slope more or less equally precipitous, surrounding uniformly sclerotized surface ................ 7