Neoneurini Bengtsson, 1918

Neoneurinae Bengtsson, 1918: 27 .

Elasmosomini Viereck, 1918: 69.

General description. Maxillary palp with 2–3 segments, labial palp with 1–2 segments. Eyes bare. First metasomal tergite sessile. Ovipositor short, bent, variable in broadness. Fore legs always modified, tarsal claws slender. Wing venation largely reduced, with widened costa, and truncate marginal cell of fore wing. Fore wing vein r present (Stigenberg et al., 2015)

Distribution. Palaearctic, Nearctic, Oriental Regions.

Key to Chinese species of tribe Neoneurini .

1. Antenna longer than head and mesosoma combined (Fig. 1); marginal cell of fore wing well defined and with a pigmented cross-vein (Fig. 8); hind wing with closed cell (Fig. 8); Heilongjiang; (genus Neoneurus Haliday) ................... N. clypeatus (Foerster, 1863) Antenna shorter than head and mesosoma combined (Figs 10–11); marginal cell of fore wing only indicated, not closed by a fully pigmented vein (Fig. 18); hind wing without closed cell (Fig. 18); (genus Elasmosoma Ruthe) .......................................................2

2. Malar space short, eyes almost touching base of mandible (Fig. 14); vein cu-a of fore wing approx. equal to vein 1-CU1 of fore wing (Fig. 18); (subgenus Elasmosoma) .....................................................................................................................................................3 Malar space medium-sized (fig. 1 in He et al., 1997); vein cu-a of fore wing distinctly longer than vein 1-CU1 of fore wing (Fig. 3, loc. cit.); (subgenus Sinoneoneurus) ..................................................................................................................................................4

3. Hypopygium deeply notched posteriorly (fig. 5 in Chou, 1985); hind inner tibial spurs approx 0.8 × as long as basitarsus; Taiwan .... ............................................................................................................................................................ E. (E.) taiwanense Chou, 1985 Hypopygium moderately notched posteriorly (Figs 20–21); hind inner tibial spurs nearly as long as basitarsus (Fig. 19); Heilongjiang ....................................................................................................................................................... E. (E.) pergandei Ashmead, 1895

4. Wing membrane brownish and veins distinctly pigmented; clypeus and face similarly transversely aciculate; second and third metasomal tergites granulate-punctate; Qinghai ..................................... E. (S.) obscuripennis (He, Chen & van Achterberg, 1997) Wing membrane subhyaline and veins largely unpigmented; clypeus smooth and face transversely aciculate; second and third metasomal tergites finely coriaceous; Ningxia .......................................... E. (S.) pallidipennis (He, Chen & van Achterberg, 1997)