Key to Neatus species (males)

1(2) Smaller (11.5–13.5 mm); disc of pronotum finely punctate, larger punctures only on sides (Fig. 10); cuticle shiny; small aedeagus (2.5–3.1 mm), with parameres very short and truncated at apex (Fig. 23); Rp from 4.03 to 4.60; North American species..................................................................................... tenebrioides

2(1) Larger (13.5–18 mm); disc of pronotum more strongly and tightly punctate, larger punctures more or less numerous and present, very rarely absent (Figs 7–9, 11–12); Palearctic species

3(6) Aedeagus proportionally small (Rp from 3.67 to 4.83), either very small and short (L=3.0– 3.2 mm) with acuminate apex (Fig. 25), or longer (L= 3.5–4.5 mm) but with parameres strongly truncated at apex (Figs 21–22)

4(5) Cuticle shiny, punctation of pronotum disc fine, larger punctures few and far between, clearly scattered (Fig. 12); punctation of elytral interstriae fine and aciculate, barely perceptible; aedeagus very small (Rp from 4.70 to 4.83) and very short (L=3.0– 3.2 mm), with parameres acuminate at apex (Fig. 25); Far East Asia .......................................... ventralis

5(4) Cuticle not very shiny, punctation of pronotum disc strong and thick, larger punctures numerous and less scattered (Fig. 9); punctation of elytral interstriae quite strong and thick, clearly visible; aedeagus distinctly longer (L= 3.5–4.5 mm) and proportionally larger (Rp from 3.67 to 4.38), with parameres strongly truncated at apex (Figs 21–22); from southern Balkans to the Caucasus and Iran .......................................................................... subaequalis

6(3) Aedeagus differently shaped, proportionally larger (Rp 2.75 to 3.96), parameres with more or less tapered apical tips (Figs 18–20, 24)

7(8) Punctation of pronotum disc finer, larger punctures few and far between or absent (Fig. 8); rather slender and subparallel, elytral disc not very convex; aedeagus with sinuate parameres on sides and apex tapering (Fig. 20), 3.8 to 4.4 mm long, Rp 3.30 to 3.81; middle Europe.............................................................................. picipes

8(7) Punctation of pronotum disc strong, larger punctures more or less invading the disc (Figs 7, 11); more convex, elytral disc even more convex posteriorly; aedeagus with apex less tapered (Figs 18–19, 24, 28); southern Europe, from Sicily and Latium in Italy, to Türkiye

9(10) Genae subparallel in front of eyes (Fig. 16); male protibiae short, their inner margin only barely sinuate (Fig. 14); aedeagus shorter (L= 4.2–4.3 mm), proportionally smaller (Rp from 3.37 to 3.96), with parameres narrowed almost in a straight line to apex which is tapered (Figs 24, 28), barely sinuate at apex, in profile (Fig. 27); southern Türkiye .......... turcicus sp. nov.

10(9) Genae more or less expanded in front of eyes (Fig. 15); male protibiae slender, with distinctly sinuate inner margin (Fig. 13); aedeagus distinctly longer (L=4.5–6.0 mm), proportionally larger (Rp from 2.75 to 3.33), with sinuate parameres on sides (Figs 18–19), clearly sinuate at apex, in profile (Fig. 26); from Latium and Sicily in Italy, to northwest Türkiye ....... noctivagus