الفهرس 
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Abstract
1.The aim of the present work is to study the taxonomy and morphology of some species of prostigmatid mites recorded in four different fresh water bodies in Sohag Governorate, Their horizontal distribution and their abundance throughout the Year.
2.Monthly samples were taken from the different water bodies by modified Birge net, during a period of two years (1975 and 1976). Water Temperature was recorded during sampling.
3.In the laboratory, the mites were picked up by a fine camel`s hair brush, under a binocular stereo-microscope, preserved in glass vials containing Koenike`s clearing agent and are then mounted in Hoyer`s medium.
4.The Mites were identified, counted, and a full study of the morphology of the recorded water mites were carried out.
5.Generally, the fauna showed a maximum number during Summer, and nearly disappeared during Winter, which may indicate that water mites have one generation during Summer.
6.The fauna was most abundant in streams characterized by slow water currents.
7.The mites were recorded in relatively high numbers, when sampled from the surface water Layer (about 20 cm.) near the shores.
8.Twelve mite species were recorded, belonging to the four Super families: Tetranychoidea, Cheyletoidea, Hyrobatoidea and Raphignatoidea.
The four super families were represented by four, four, one and three species, respectively.
9.The individual numbers of mite species belonging to Super family Tetranychoidea represent the majority of the of the recorded mites (66% of the total catch), whereas Super family Hygrobatoidea represents 4.0% only of the total catch.