Seven new species, Cosmopterix brevicaudella sp. nov., C. baihashanella sp. nov., C. sichuanella sp. nov., C. bifidiguttata sp. nov., C. longivalvella sp. nov., C. nanshanella sp. nov., C. jiangxiella sp. nov., are described with illustrations from China, and five newly recorded species, C. argentitegulella Sinev, C. setariella Sinev, C. rhynchognathosella Sinev, C. gracilis Sinev, C. dulcivora Meyrick (=C. sublaetifica Kuroko), from China are redescribed with illustrations. Two already known species, C. attenuatella (Walker), C. phyllostachysea Kuroko, are recorded and illustrated.
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