Pachybrachis jacobi, 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 : 88

26 ʹ. Median lobe in en-face view of near equal width but narrowing slightly to ALM, then gently curved to terminus; OS about twice as long as wide, basal plates lightly pigmented; pre- and post-orificial lengths very small; median lobe very narrowed in lateral view, DEO deflexed at near 30° angle, without denticles or beards; whitish yellow with extensive diffuse black maculae .................. ................. 28. P. jacobi Barney (in part)