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The genus Colotrechnus of Colotrechninae, with a new recorded species Colotrechnus viridis (Masi), is reported in China for the first time. Morphological descriptions, distribution and morphological figures are provided. All the specimensare deposited in the Zoological Museum, Institute of Zoology, Chinese Academy ofSciences.Thomson (1876) established subfamily Colotrechninae as a subdivision of the Pteromalidae. Subsequently, Ashmead (1899) treated the group as a subfamily of Cleonymidae. More recently it was placed as a tribe under Pteromalidae (Boucek,1958) and later upgraded to a subfamily (Boucek, 1964). The subfamily is nowdivided into five tribes by Boucek in 1988: Hetreulophini, Amerostenini, Divnini,Colotrechnini and Uzkini. The whole group can be simply characterized by thepresence of large axillulae separated from the scutellum by (mostly) outcurving grooves or lines visible dorsally, and by the absence of an occipital carina (Boucek,1988).To date, 19 valid genera have been described in this subfamily (Noyes, 2013).They are widely distributed in the world (Noyes, 2013). Among them, Colotrechnus is the best known genus of Colotrechninae. Until now, 6 species have been describedin this genus (Noyes, 2013). There is not any genus record in china of this subfamilyuntill now. In this study, Colotrechnus viridis (Masi) is found in China for the first time and it is the first record of the subfamily Colotrechninae.