Synopsis Introduction. Historical resume. Biology. Distribution. Economic importance. Phylogeny of tetrastichinae. Materials and methods. Terms and measurements. Diagnostic characters of tetrastichinae. Key to Genera of Tetrastichinae of Indian subcontinent: 1. Aceratoneuromyia Girault. 2. Anaprostocetus Graham. 3. Aprostocetus Westwood. 4. Aprostoporoides Narendran. 5. Baryscapus Forster. 6. Ceratoneura Ashmead. 7. Citrostichus Boucek. 8. Goethella Girault. 9. Holcotetrastichus Graham. 10. Idukkiella Narendran gen. Nov. 11. Iniostichus Kamijo and Ikeda. 12. Kiggaella Narendran. 13. Kolopterna Graham. 14. Kostjukovius Graham. 15. Kostjurixia Narendran gen. nov. 16. Lasalleola Narendran. 17. Leptocybe fisher and La Salle. 18. Melittobia Westwood. 19. Mestocharella Girault. 20. Minotetrastichus Kostjukov. 21. Narendrania Fousi. 22. Neogasterichus Narendran. 23. Neomestocharella Narendran and Fousi. 24. Neotrichoporoides Girault. 25. Nesolynx Ashmead. 26. Oomyzus Rondani. 27. Parachrysocharis Girault. 28. Quadrastichus Girault. 29. Sigmorphora Rondani. 30. Tachinobia Boueek. 31. Tamarixia Mercet. 32. Tetrastichus Haliday. 33. Thripastichus Graham. 34. Farooqiella Ahmad. Summary. Acknowledgements. References. Host-parasite index. Associated plants. Index to genera and species.