An extensive survey for the diversity of mymarid fauna, internal solitary egg parasitoid was conducted in different agroecosystems of Tamil Nadu, during August 2018 -April, 2019. A total number of 1901 mymarid specimens were collected by using yellow pan traps in different cropping ecosystems viz., mango, sapota, grapes, brinjal, red gram, cotton, coffee, medicinal plants, and marigold. The mymarids were identified upto generic level. Out of 38 genera (Manickavasagam and Athithya, 2018) reported in India so far, 20 genera have been described from this faunistic study