Montandon (1896b: 130) suggested Coptosoma chinense Signoret, 1881 as a junior synonym of C. biguttulum, but Josifov & Kerzhner (1978) validated the species C. chinense. Part of the type material of C. biguttulum belongs to C. capitatum Jakovlev, 1880 (Kerzhner & Jansson, 1985), both valid species. Most records of C. biguttulum from China probably concern C. chinense (Kerzhner, 2003a: 104).
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