Key to species of Neognamptodon Belokobylskij

1 Basal area of second metasomal tergite triangular and medially approx. 0.35 × as long as wide anteriorly; setose part of ovipositor sheath approx. 0.20 × as long as fore wing; mesosoma reddish brown; Afrotropical.... N. suturalis Belokobylskij, 1999

- Basal area of second metasomal tergite transverse and medially 0.13–0.15 × as long as wide anteriorly; setose part of ovipositor sheath 0.25–0.35 × as long as fore wing; mesosoma dark brown or black......................................... 2

2 Mesoscutum without medio-posterior depression; anterior half of notauli crenulate; vein 3-SR of fore wing approx. 1.5 × as long as vein r (Fig. 581 in Fischer 1987); area behind basal area of second metasomal tergite densely granulate-rugulose; setose part of ovipositor sheath approx. 0.25 × as long as fore wing; dorsal carinae of first tergite remained separated basally; mesosoma black; Australian..................................................... N. novobritannicus (Fischer, 1971)

- Mesoscutum with long groove-like medio-posterior depression (Fig. 51); anterior half of notauli smooth; vein 3-SR of fore wing 2.2–3.0 × as long as vein r (Figs 49, 62); area behind basal area of second metasomal tergite coarsely crenulate (Fig. 52), but less so in ♂ (Fig. 63); setose part of ovipositor sheath approx. 0.35 × as long as fore wing (Fig. 48); mesosoma dark brown; dorsal carinae of first tergite united basally (Figs 52, 63); Oriental............. N. laticauda Tan & van Achterberg, sp. n.