The authors gratefully thank Xu Yong, Su Da-Shui (Institute for the Control of Agrochemicals of Zhejiang Province, Pesticide Quality Control and Supervision Station) who always made the materials we could not get at Z. A. U. available, even at very short notice. We also would like to deeply thank Wu Jia Lun,Lou Jiang, Zhu Guo Nian, Pin Xiao Fei, Li Shao Nan and Wu Yun Long for their kindly Assistant.