In the zone of Meskine (Maroua, Cameroon), observations have been made (dry season) on inventory species of Hoverflies depending on the diversity of food resources available. The main goal was to find Entomological knowledge which can facilitate the rise in yields in agricultural practices while preserving the environment in the agricultural site. The surveys were made every three days in the form of transect. Attractive plant species for the Syphidae are removed and the functional role of each species of Hoverfly determined. The results obtained helped to identify 21 species of Hoverflies....