Key to species (2) of D. caoduroi group

1. Elytra more elongate with length/width ratio 1.72–1.78. Pronotum quite sub-square with length/width ratio 0.90–0.95............................................................................................. D. caoduroi sp. n.

1’ Elytra less elongate with length/width ratio 1.66–1.69. Pronotum transverse with length/width ratio 0.83–0.86............................................................................................ D. confusa (Pierotti, 2012)