Key to species (13) of D. pfisteri group

1. Protibia with one acute spine on inner edge..................................................... D. fossor sp. n.

1’ Protibia with two-four acute spines on inner edge............................................................ 2

2. Rostrum more transverse with length/width ratio 0.60.......................................... D. montivaga sp. n.

2’ Rostrum less transverse with length/width ratio 0.65–0.85..................................................... 3

3. Elytral declivity with flattened setae (00°–15°). Unknown male..................................... D. bertoni sp. n.

3’ Elytral declivity with setae recumbent or raised (16°–45°) if flattened known male.................................. 4

4. Protibia with four acute spines on inner edge................................................... D. angelae sp. n.

4’ Protibia with two-three acute spines on inner edge............................................................ 5

5. Protibia with two acute spines on inner edge................................................... D. zingara sp. n.

5’ Protibia with three acute spines on inner edge............................................................... 6

6. Vertex between eyes twice as wide as mesorostrum between antennae (ratio 2.00)............... D. pfisteri (Stierlin, 1864)

6’ Vertex between eyes less than twice as wide as mesorostrum between antennae. Ratio1.75–1.90....................... 7

7. Rostrum tapered anteriad (Fig. 33).......................................................... D. magrinii sp. n.

7’ Rostrum enlarged anteriad (Fig. 35)....................................................................... 8

8. Elytra not parallel to sides............................................................................... 9

8’ Elytra parallel to sides................................................................................. 10

9. Body (including antennae and legs) more robust with many raised setae (30°–45°)..................... D. nobilis sp. n.

9’ Body (antennae, legs) less robust with sparse and recumbent setae (15°–20°).......................... D. giustoi sp. n.

10. Elytral declivity with flattened setae (0°–15°). Known male....................................... D. sabellai sp. n.

10’ Elytral declivity with recumbent or raised setae (16°–45°). Unknown male....................................... 11

11. Elytra less elongate with length/width ratio 1.67–1.70. Fovea visible............................... D. paladinii sp. n.

11’ Elytra more elongate with length/width ratio 1.72–1.79. Fovea not visible........................................ 12

12. Elytral declivity with raised (30°–45°) clavate setae............................................... D. elima sp. n.

12’ Elytral declivity with recumbent (15°–30°) quite spatulate setae................................. D. illuminatae sp. n.