Abstract: This paper described a new species: Zaommoencyrtus brachytarsus sp.n.ex.Batocera horsfieldi(Hope) collected from Hubei Province; the other two species: Austroencyrtus ceresii(Liao et Tachikawa) and Oophagus batocerae Liao parasitized on longicorn beetle were keyed in this paper.It is also the first record of Zaommoencyrtus Girault from China.All the specimens deposited in the Department of Plant Protection,Zhejiang Agricultural University.Zaommoencyrtus brachytarsus sp.n.Host: Batocera horsfieldi (Hope).Distribution:Prov.Hubei.Specimen examed:holotype ♀,Hubei(without exact type locality),1985—04,Zhan,Zhongcai,eggs of Batocera horsfieldi(Hope),907691;paratypes 7♀♀,same data as holotype.Diagnosis:This species very similar to Zaommoencyrtus liaoi (Trjapitzin),1962,but can be distinguished form the latter by:(1)hind basal tarsi 2.6 times as long as wide,shorter than second third tarsi combined,the latter with basal tarsi as long as second-third tarsi combined;(2)hind femora 2.4 times as long as wide,the latter with hind femora 3.0 times as long as wide;(3)fore wings with 4 sensory on apex of stigma,the latter with 2 sensory on apex of stigma;(4)apical half of mid tibiae yellow,basal half black,the latter with mid tibiae without dark or black colour.