Pachybrachis nigricornis, (Say)

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

22 ʹ. Smaller (L <2.5 mm), pronotum and elytra ranging from entirely black to obscurely margined with rufous to appearing black with subsutural vitta and margin yellow ........... ............. 38. P. nigricornis (Say) (in part)