Key to separate 7 species of the Homoneura (Homoneura) bistriata group

1. Wing with brown apical spot at tip of Sc and R1 and brown cloud on r-m entirely or slightly confluent................... 2

- Wing with brown apical spot at tip of Sc and R1 and brown cloud on r-m separated distinctly.......................... 6

2. Wing with a brown wide transverse band extending from tip of subcostal cell and preapical section or tip of R2+3, confluent with brown cloud on r-m and medial spot between r-m and apical spot on R4+5...................................... 3

- Wing without brown wide transverse band as above........................................................... 4

3. Wing with brown integrated transverse band (see Yang et al, 2002: fig. 9); antenna long plumose; mesonotum with two dark brown stripes; abdominal tergites 3–6 each with blackish medial spots.............. .. H. (H.) hainanensis Yang, Hu & Zhu

- Wing with two small hyaline spots inserting in brown wide transverse band (see Yang et al, 2001: fig. 14); antenna pubescent; mesonotum without brown stripes; abdominal tergites 4–6 each with narrow blackish medial stripe................................................................................................. H. (H.) extensa Yang, Hu & Zhu

4. Mesonotum without brown stripes; surstylus situated at tip of epandrium, long, curved and truncate apically (see Sasakawa & Ikeuchi, 1985: fig. 4).............................................................. H. (H.) mayrhoferi Czerny

- Mesonotum with two narrow brown stripes; surstylus situated at anterior ventral corner or at middle of epandrium, short claviform............................................................................................... 5

5. Palpus yellow, except for brown on apical 1/3–1/2; abdominal tergites 4–6 each with a brown medial spot; surstylus slightly curved, tips of two hypandrial apodemes close each other (see Sasakawa & Ikeuchi, 1982: fig. 5)....................................................................................................... H. (H.) bistriata (Kertész)

- Palpus yellow, except for black apically; abdominal tergites 5–6 each with a small black medial spot; surstylus curved downward apically, tips of two hypandrial apodemes parallel (Yang, Hu & Zhu, 2002: figs 2, 3).................................................................................................. H. (H.) conjunctiva Shi, Wang & Yang

6. Mesonotum with four brown stripes; face with a pair of grayish black spots on upper half and basal sections of two spots confluent, and a pair of brown thin lateral stripes; abdominal tergites 3–6 each with a brown stripe-like spot and a pair of transverse stripe-like lateral spots on posterior margin; epandrium slightly contorted on dorsal margin in lateral view; surstylus narrow claviform (Fig. 200)...................................................... H. (H.) quadristriata sp. nov.

- Mesonotum with two brown stripes; face without black spots or stripes; abdominal tergites 1–6 each with a small black spot; epandrium not contorted in lateral view; surstylus wide sheet-like (see Yang et al, 2002: figs 4–6)................................................................................................. H. (H.) separata Yang, Hu & Zhu