Key to species (5) of D. exigua species group

1 Elytra with short, spatulate, flattened setae (Figs. 1 Fa, 1Ga)...................... D. himerensis (Bellò & Baviera, 2011)

1’ Elytra with widened or clavate, recumbent, raised, semi-erect setae (Figs. 1 Fb–d, 1Gb–d)............................ 2

2 Elytral declivity with more elongate and semi-erect setae (45°–75°).......................... D. exigua (Stierlin, 1861)

2’ Elytral declivity with less elongate and recumbent, raised setae (15°–45°)......................................... 3

3 Recumbent setae on elytral declivity; elytra without humeri....................... D. trinacriae (Bellò & Baviera, 2011)

3’ Raised setae on elytral declivity; elytra with humeri.......................................................... 4

4 Elytra with more raised setae (40°–45°). Rostrum with epistome................................ D. margheritae sp. n.

4’ Elytra with less raised setae (30°–40°). Rostrum without epistome.................................. D. genistae sp. n.