Pachybrachis shirleyae, 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 : 89

40 ʹ. Eyes moderately separated (IOD = 0.24– 0.31 mm); pronotum yellow with brown to black M-shaped macula, not sharply defined; face yellow with brown median line extending down from vertex between eyes, punctation sparse; median lobe in en-face view with a round to oval OS, extending apically as a groove between thickened ALM, thus forming a triangular extension of DEO; in lateral view, shaft of median lobe very long and inflated, creating a long tube with paired beards at widest point of OS and before triangular extension of DEO ......... ....................... 52. P. shirleyae Barney