Counts and measurements were made on specimens of the Halloween darter (Percina crypta) and of the Blackbanded darter (Percina nigrofasciata, sensu lato). Data used in the original description of Percina crypta are included, in addition to counts (and in some cases measurements) for 66 additional Percina nigrofasciata from the Savannah, Altamaha, and upper Chattahoohee river systems, and 1 additional Percina crypta.