Table 1.

Synoptic key for the identification of D. improvisus, D. camerinus and D. aprutiensis.

Species/character	Long median setae at the anterior border of the pronotum	1st abdominal sternum	Dorsal profile of pronotum in lateral view
D. aprutiensis	− (Fig. 18)	Two large, isolated, sclerotized setal bases only (Figs. 10, 14e)	Flat (Fig. 20d)
D. camerinus	− (Fig. 18)	Fused sclerotized patches (Figs. 9, 14d)	Rounded (Fig. 20b)
D. improvisus	+ (Fig. 17)	Fused sclerotized patches (Figs. 8, 14c)	Rounded (Fig. 20b)