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Abstract The subterranean termite Psainnotermos arbostoma Desn.) is considered as one of the most destructive pest in the arid and semi—arid eoosystemes, especially in Upper Egypt. The present study had been conducted in Sohag Governorate for covering the following points: 1— Studying the protozoan fauna of P. ybostp a— Iorphc1ogy, ident ii cat ion and the re1etis abundance of different species of Protozoa: Four species of Protozoa from order Iiyperasti4d€. were identified in the guts of diflexentostes of P. YQSt_OA&c err,,. They were: 1— Hoiomastiptoides pparqotern4_tids Grass & Uollande 2- Pseudotriohoqymjha a’fl Hollande & CarruetteVale titin. 3— Z a1n2M.QcpcaQ Ghidini 4- Spirotrichonyinphelia Psaçnrnotgrnitd Hollande & Carrutte--Valentin. |