Key to species (13) of D. adrianae group

1. Elytra with spatulate setae (Fig. 1 Ga)...................................................................... 2

1’ Elytra with clavate setae (Fig. 1 Gb)....................................................................... 7

2. Pronotum sub-square (length/width ratio 1.00)..................................................... D. alta sp. n.

2’ Pronotum transverse (length/width ratio 0.83–0.95)........................................................... 3

3. Rostrum subparallel to sides................................................................ D. calatina sp. n.

3’ Rostrum subconical to sides.............................................................................4

4. Antenna short with scape/funicle ratio 0.60–0.70.................................................. D. juliae sp. n.

4’ Antenna elongate with scape/funicle ratio 0.74–0.83.......................................................... 5

5. Elytra with catenulate setae flattened (0–15°).................................................... D. siderea sp. n.

5’ Elytra with setae recumbent (15°–30°), raised (30°–45°), semi-erect (45°–75°)..................................... 6

6. Elytral declivity with setae recumbent/raised (10°–40°) less spatulate................................ D. sicana sp. n.

6’ Elytral declivity with setae more spatulate raised/semi-erect (40°–75°)............................. D. adrianae sp. n.

7. Pronotum more transverse with ratio length/width 0.83......................................... D. forbicionii sp. n.

7’ Pronotum less transverse with ratio length/width 0.90–0.96.................................................... 8

8. Protibia with two acute spines on inner edge................................................... D. sicelidis sp. n.

8’ Protibia with three acute spines on inner edge............................................................... 9

9. Elytral declivity with setae very widened at apex and recumbent (15°–30°).......................... D. belicensis sp. n.

9’ Elytral declivity with setae widened at apex and raised (30°–45°)............................................... 10

10. Head with vertex/mesorostrum apex ratio 1.75–1.80............................................ D. hiemalis sp. n.

10’ Head with vertex/mesorostrum ratio 1.95–2.00............................................................. 11

11. Elytral declivity with setae quite raised (30°–35°).............................................. D. ibleiensis sp. n.

11’ Elytral declivity with setae raised (35°–45°)................................................................ 12

12. Elytra more elongate (ratio: 1.63–1.65). Pronotum sub-square....................................... D. enzoi sp. n.

12’ Elytra less elongate (ratio: 1.57–1.60). Pronotum transverse...................................... D. laliaensis sp. n.