'This investigation was canied out to survey mites collected from certain regions of North Sinai Peninsula, Northwestern Coast and Siwa Oasis. Results indicated that survey proved the occurrence of 48 species belonging to 31 genera and 19 families where gasmid mites ranked the first as it included the highest numbers (37 species) followed by actinedid mites (5 species), oribatid mites(5 species) and acaridid mites(one species). Concerning Leafaspis astronomicus (Koch) that was recorded from North Cost region reared on Rhabdifis scanica Allgen and Meioidogyne incognifa (Kofoid 8. White) Chitwood at 25°C, prey species affected duration. fecundity and feeding capacity of this predator. Generally, R. scanica was more suitable prey for L. astronomicus comparing with M. incognifa. However, female consumed an averaged 140.8 and 27'20 juveniles of M. incognifa during immature and adult stage, respectively. Thus L. astronomicus can be considered as biological agent against M. incognifa.