Key to the species of the Deronectes sahlbergi -group (new)

1. Posterior angles of pronotum ± rectangular, margin before base concavely sinuate (fig. 50); species from western Turkey and adjacent Aegean Islands......................................................................... sahlbergi

- Posterior angles of pronotum obtuse, margin before base rectilinear or even convex (fig. 51); species from Antalya province, Turkey ........................................................................................ witzgalli