Key to species of the nominotypical subgenus of the genus Nalassus from Turkey

The key is modified from KΕඌΚΙΝ et al. (2017b).

1 Ventral aspect of eye with weak posterior ventral impression. ............................................ N. becvari sp. nov.

– Ventral aspect of eye with distinct deep groove. ........ 2

2 Wings fully developed, with apical and medial flecks, longer than elytra, folded under elytra. Recurrent cell presented. Male abdominal ventrite 1 without brush of long setae in middle. Elytra parallel. ............................... ............................................ N. plebejus (Küster, 1850)

– Wings not developed, absent or reduced (with only some small veins R, Cu, A), without recurrent cell and flecks. Male abdominal ventrite 1 with brush of long setae in middle. Elytra not parallel. .............................. 3

3 Wings absent. Body wide, robust, strongly shining, pronotum with projected anterior angles. Male middle antennomeres not thickened. ........................................... ........................................... N. graecus (Seidlitz, 1896)

– Wings present, reduced, much shorter than elytra. Body elongate, moderately shining, anterior angles of pronotum not projected, widely rounded. Male middle antennomeres distinctly thickened. ............................. 4

4 Body brown, without bronze shine. Pronotum not cordiform, with weakly rounded margins. .......................... .......................... N. faldermanni (Faldermann, 1837)

– Body black, with bronze shine. Pronotum weakly cordiform, with basally emarginated margins. ................... ...................................... N. dilaticornis (Reitter, 1922)