Key to species of Oedalea from south eastern Asia

1 Wing vein M 2 apically incomplete, not reaching wing margin China (Guangdong)...... O. nanlingensis Yang et Grootaert

- Wing vein M 2 complete, reaching wing margin............................................................. 2

2 Wing with pterostigma slender, longer than wide, tapered apically (Fig. 17)....................................... 3

- Wing with pterostigma broad, subquadrate, truncate apically (Figs 3, 10, 24)...................................... 4

3 Antennal stylus thick, finger-like, uniformly thick proximal to apex. China (Henan).... O. baiyunshanensis Saigusa et Yang

- Antennal stylus narrower than first flagellomere, tapered (Fig. 16). China (Hebei)............... O. wulingshana sp. nov.

4 Halter knob pale, whitish to yellowish (Fig. 22)............................................................. 5

- Halter knob dark (Figs 1, 8)............................................................................ 6

5 Antenna 1.5 times head height. Myanmar ................................................... O. longicornis Frey

- Antenna 1.8 times head height (Fig. 23). China (Tibet).......................................... O. yangi sp. nov.

6 Wing with pterostigma trapezoidal, oblique on outer margin (Fig. 3). China (Tibet)................ O. linzhiensis sp. nov.

- Wing with pterostigma subrectangular, nearly straight on outer margin (Fig. 10)................................... 7

7 Wing with pterostigma subrectangular (Shamshev 2020, fig. 1). Vietnam .................... O. vietnamensis Shamshev

- Wing with pterostigma suboval (Fig. 10). China (Yunnan)................................... O. wenliangi sp. nov.