Pachybrachis calcaratus, Fall, 1915

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 : 90

51. Protibiae emarginate inwardly at apex and with a long, spur-like process at inner angle ......................... 6. P. calcaratus Fall

51 ʹ. Protibiae unmodified. ....................... 52