Abstract This is the first part of a series of articles dealing with corrections and additionsto The Gomphid Dragonflies of China published by the author in 1990.Comprised in thisarticle are the following items.(I)GOMPHINAE.(1)Revisionary study of the genusDavidius Selys with 7—marks on the frontal surface of synthorax.l.D.truncus Chao,sp.nov.=D.fruhstorferi junior Chao 1954(in part),=D.fuhstorferu serenns Asahina 1956(in part);2.D.fruhstorferi Martin=Gomphus junior Navas 1936,syn,nov.,=D.serenusNeedham 1941,syn.nov.,=D.f,junior Chao 1954(in part),=D.f.serenus Asahina1956(in part),=D.f.guizhouensis Chao et Liu 1990,syn.nov.,3.D.trox Needham,redescription,(?),neallotype,(?);4.D.squarrosus Zhu;5.D.zhoui Chao,sp.nov.,=D.trox zhou 1986,not Needham 1931,misidentification,=D.Trox Yang et Davies1993, not Needham 193l, misidcntification. (2) Trigomghus lautus Needham,redescription, (?), neallotypc,(?). (3) Anisogomphus anderi Licftinck,description ofnymph. (Ⅱ) ONYCHOGOMPHINAE: (4) Nihonogomphus is divided into
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