The host finding, ovipostition of Anagrus incarnafus Haliday and the sex ratio of its offsprings was determined. Both male and female mate immediately after emergence and the female parasitoid search for host eggs by drumming with antenna immediately after release on the rice seedings. Time required for the host searching, drumming with antenna, tapping and inserting with ovipositor, and ovipositing of A. incarnaws takes 188.5, 17.5, 72.4 and 206.7 seconds, respectively. The time required for mating takes 16-21 seconds. The sex ratio of offsprings between female and male was about 3: 1 in mated females and all the offsprings emerged from the eggs of unmated females were males. So, A. incarnafus can reproduce zygogenetically and parthenogenetically and the mode of parthenogenetic reproduction was an arrhenotokous parasitoid.