Key to separate 5 species in the Homoneura (Homoneura) abnormis group

1. A brown subapical spot on R2+3 and medial spot on R4+5 behind the vertical level of dm-cu ............................ 2

- A brown subapical spot on R2+3 and medial spot on R4+5 at the same vertical level of dm-cu (Fig. 14).................... 3

2. Mesonotum with acr in 6 rows; surstylus with a narrow curved apical process in lateral view...... H. (H.) jiangi Gao &Yang

- Mesonotum with acr in 8 rows; surstylus with apical process slender, with dorsal setulae, and subapical process slender, blunt apically...................................................................... H. (H.) vietnamensis Sasakawa

3. Apical spots on R4+5 and M1 separated entirely; mesonotum with acr in 6 rows; surstylus consisting of an apical process and a small teeth-like process in lateral view............................................. .. H. (H.) abnormis Gao &Yang

- Apical spots on R4+5 and M1 confluent or slightly separated; mesonotum with acr in 8 rows; surstylus with two pairs of furcated processes in lateral view................................................................................. 4

4. Abdominal tergite 6 without black round spots near ventrolateral margin; syntergosternite with dorsal setulae and three setulae around spiracle; hypandrium with four hypandrial processes (Figs 159, 161)................ H. (H.) longifurcata sp. nov.

- Abdominal tergite 6 with a pair of black round spots near ventrolateral margin; syntergosternite without dorsal setulae and a setula around spiracle; hypandrium with three hypandrial processes (Figs 311, 313)............ H. (H.) triprocessa sp. nov.