The study on biology of nymphal adult parasitoid Aenasius arizonensis Hayat on cotton mealybug, Phenacoccus solenopsis Tinsley was conducted under laboratory conditions during February to April, 2016. Preliminary survey on host plants of P. solenopsis was conducted along with its natural enemies and A. arizonensis was found to be a commonly occurring natural enemy along with Cryptolaemus montrouzieri. The parasitoids were collected and reared on cotton mealybug for one generation, then allowed to mate. The parasitized mummies of mealybugs were taken separately for emergence of parasitoid and fed on 50% honey solution. The studies showed that the developmental period of parasitoid till formation of pupa was 10.31 days, pupal stage was 8.60 days. The longevity of adult female wasp was 70.20 days and male wasp was 53.30 days. The total average duration of life cycle was 89.10 days.

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