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Two species, Thrips golili sp. nov. and Thrips silybum sp. nov. are described from flowering plants of northeastern Iran. The color forms of T. golili sp. nov. are discussed. Thrips apicatus Priesner is reported for the first time from Kish Island in the Persian Gulf. Published record as of T. coloratus Schmutz and T. juniperinus Linnaeus from Iran are not confirmed and description of T. alavii Mirab-balou, Tong & Chen is considered doubtful here. The checklist of Iranian Thrips is updated to contain 37 species.