Key to species of Torquispa

1. Elytra at base with eight rows of punctures plus scutellar row of 1–5 punctures; punctation of elytra normal; smaller species, length 11.20–14.20 mm; interocular plate strongly convex, appears tuberculate; interantennal process short extending at most to ¼ length of antennomere I (Figs 189, 190)............................................. T. convexifrons sp. nov.

-. Elytra at base with six rows of punctures and without scutellar row; punctation of elytra very coarse, particularly outside of interval 2; larger species, length 15.90–17.40 mm; interocular plate moderately convex, not tuberculate; interantennal process elongate, from slightly shorter to slightly longer than antennomere I (Figs 197, 198)............ T. vittigera Uhmann, 1954