Key to separate 8 species in the Homoneura (Homoneura) laticosta group

[Modified from Shi and Yang 2014]

1. Wing sapromyziform, with small costal black spines extending slightly before apex of R4+5....... .. H. (H.) kaszabi Shewell

- Wing homoneuriform, with small costal black spines extending to apex of R4+5..................................... 2

2. Wing with broad deep brown area extending from costal margin to M1 and a dark stripe on CuA1; mesonotum with a broad grayish brown medial stripe and a pair of postsutural lateral spots and short lateral stripes....... H. (H.) discoidalis (Kertész)

- Wing with brown area extending from costal margin to tip of R4+5 or M1, but no dark stripe on CuA1; mesonotum without pat- tern as above.........................................................................................3

3. Mesonotum with a blackish gray area between postpronotum on anterior margin, a pair of blackish gray postsutural lateral stripes extending to postsutural third dorsocentral seta; acrostichal setae in 4 rows; katepisternum blackish gray on lower part.................................................................................. H. (H.) czernyi Shatalkin

- Mesonotum yellow or yellowish brown, without pattern as above; acrostichal setae in 6–8 rows; katepisternum yellow..... 4

4. Mesonotum with a pair of brown medial stripes between dorsocentral setae rows; abdominal tergites 1–4 blackish brown except for yellow lateral margin and tergites 5–6 blackish brown; surstylus bifurcated apically in lateral view............................................................................................ H. (H.) yehliuensis Sasakawa

- Mesonotum without brown stripes; abdomen yellow; surstylus not as above....................................... 5

5. Arista pubescent, with longest ray about 1/4 height of 1 st flagellomere; surstylus hooked apically in lateral and posterior views................................................................................ H. (H.) grahami Malloch

- Arista plumose, with longest ray longer than 1/3 height of 1 st flagellomere; surstylus not as above...................... 6

6. Antennal 1 st flagellomere yellowish brown on apical half; wing with brown spots on r-m and dm-cu; abdominal tergites 3–4 or

3–6 with a small brown medial spot; surstylus consisting of an anterior ventral process and a short apical process in lateral view; phallus narrow subuliform apically with a small apical incision in ventral view..... .. H. (H.) obtusa Yang, Hu and Zhu - Antennal 1 st flagellomere yellow; wing without brown spots on r-m and dm-cu or only brown spot on dm-cu; abdominal tergites without spot; surstylus and phallus not as above........................................................... 7

7. Wing only with brown spot on dm-cu; surstylus short, slightly curved and acute apically in lateral view.................................................................................................. H. (H.) laticosta (Thomson)

- Wing without brown spot on r-m and dm-cu; surstylus long and curled upward in lateral view.... H. (H.) longa Gao and Yang