The present paper reviews available studies on the biology, ecology and conTrioxys indicus, a polyphagous endoparasitoid of aphids infesting agricultural crops and vegetables, viz.,Aphis craccivoraandA. gossypii, and presents an up-to-date bibliography. The courtship and mating behaviour, host selection, fecundity, oviposition pattern, development, longevity, sex ratio and density responsiveness behaviour as well as various physico-chemical and biological factors influencing the biology of the parasitoid are described and compared with other aphidiids. Likewise the seasonal history, hyperparasitism, host association and distribution ofT. indicusare also presented. Out of 24 aphid hosts ofT. indicusrecorded, 21 belong to the Aphidinae. Eleven species of hyperparasitoids are recorded. The laboratory culture technique, storage of the mummies at low temperature, release methods and field release ofT. indicusare included in the control efficiency section. The mummy stage of the parasitoid is recommended for release purposes as it can be stored for up to one month at 4°C. Field release studies ofT. indicusreveal that the population of aphids can be checked by the parasitoid's introduction. The list of references constitutes a bibliography of most of the relevant papers citing the biology, ecology and control efficiency of the aphidiid parasitoids of the world.