Studies were made on eggs and larvae of the parasitoid Microctonus sp. within their host, Hypera brunneipennis Boh. Development began 24 hrs after oviposition where the egg increased in length during the 5 days of incubation period from 357µ.to 1107µ.
The first instar larvae measured 1685±151 s long, caudate in form, transparent or whitish-yellow in colour. It goes into a long diapause up to 220 days of parasitism and resumes development in December. The last instar larva emerging from the host is 4685±83i.t long, grub-like and pale dull yellow. It immediately pupates. Adult parasitoids emerged after about two weeks and after mating, began egg lying in the larvae of H. brunneipennis. By the end of March the parasitoid population is represented as first larval instar within their host adults, until next season.