Key to Heteromyzinae ge4nera

1. Vein R 1 long, reaching costal vein distal to r-m as in Fig. 4. Strong sexual dimorphism in width of frontal vitta and face................................................................................................ Heteromyza

- Vein R 1 shorter, reaching costal vein at level of r-m or slightly proximally as in Fig. 5. No sexual dimorphism in width of frontal vitta and face......................................................................................... 2

2. Arista longer than width of head. Usually presutural dc absent (if present, clearly shorter than postsutural dc). Male S6 shorter than S5. Male genitalia small, anus caudally directed. Ovipositor simple, regular and telescopically narrowed..................................................................................................... Tephrochlamys

3. Arista shorter than width of the head. 1+3 dc (presutural dc as long as postsutural in males, shorter in females). Male S6 not shorter than S5. Male genitalia large, anus ventrally directed. Ovipositor distally flattened and bent upwards, forming an open ring ventrally............................................................................. Tephrochlaena