Key to species of genus Gastrozona Bezzi from India

1. Scutellum entirely yellow................................................................................2

- Scutellum with apical black marking/ medial black subrectangular spot...........................................4

2. Wing with radial-medial band not reaching costal margin; costal band reduced to widely separated longitudinal markings......................................................................................... G. balioptera Hardy

- Wing with radial-medial band reaching costal margin; costal band continuous from cell r1 to wing apex..................3

3. Posterior apical band present, pterostigma brown............................................... G. montana Bezzi

- Posterior apical band absent, pterostigma orange-yellow......................................... G. parviseta Hardy

4. Scutellum with apical black spot, scutum without submedial yellow vitta, radial-medial band narrow (as wide as width of r-m crossvein)............................................................................. G. proterva Hering

- Scutellum with subrectangular medial black band, scutum with yellow submedial vitta, radial medial band wider than width of crossvein r-m.........................................................................................5

5. Scutum brown with lateral postsutural yellow vittae absent in female, narrow in male; wing with anterior apical band broad, completely confluent with vein R4+5 and without a triangular, hyaline indentation................... G. nigrifemur sp.nov.

- Scutum brown with lateral postsutural yellow vittae broad in both sexes; wing with anterior apical band not confluent with vein R4+5 and with a hyaline indentation....................................................................6

6. Posterior apical band fused with anterior apical band....................................... G. fasciventris Macquart

- Posterior apical band directed towards subapical band........................................... G. soror (Schiner)