Abstract: Oestrus ovis is an insect of cosmopolitan distribution and nasal sheepmyiasis due to its larval injury widely occurs in the pastures of most countries of the world. We have carried out a series of studies on its bionomics since 1990.This report concerns some results of basic importance including the interrelation between adult emergence and the environment factors, the location of larvae in the soil, the pupation posture, the pupation in relation to the growth level of the larvae, the adult activity, its life- span and sex retio.

Key words: Oestrus ovis, pupation, adult emergence