الفهرس 
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Abstract
This study is concerned with the following parts: 1 A complete survey was carried out on six localities at Dakahlia governorate. AlMansoura, Aga, Sherbeen, Alsynblawain, Dekrness and MeetGhamer from April 2004 up to May 2005. 66 mite species representing 44 genus and 25 families under 4 suborders was conducted. They are classify according to their feeding nature into 41 species of predacious and 25 species of nonpredacious 2 Population dynamic of the nonpredacious mites and their predaceous mites associated with some stored products wheat flour and wheat bran in two localities Sherbeen and MeetGhamer in Dakahlia Governorate from May 2004 up to April 2005 it was found that; the appearance and disappearance of the collected mites (nonpredacious and predacious) once depend up on the presence of different factors such as biotic factors as other mites, insects, fungi<U+2026>.etc, and abiotic factors as maximum temperatures, minimum temperatures and relative humidity, other factors not taken in consideration, all affecting on the population dynamics of the collected mites and the peak was attributed to rise of temperature and relative humidity which favoured the mite reproduction and shortened its life cycle. Generally, Sherbeen region was observed harbored more mites than those obtained at MeetGhamer district. 3 Biological studies were occurred on Caloglyphus beta Attiah when reared on Aspergillus flavus fungi at 25 and 35(R@(BC and 75% R.H. The results revealed that, the males emerged earlier than the females at both two temperature degrees. But at the higher temperature 35<U+00BA>C all the stages occurred faster than the lower temperature 25<U+00BA>C.