Cyrtotrachelus thompsoni Alonso-Zarazaga & Lyal, 1999 is a common species widely distributed in Asia, including China, Japan and Taiwan from East Asia; India and Pakistan from South Asia. In this study, we provided the first report of the pronotum phenotype difference of C. thompsoni between Matsu islands and Taiwan island. The photograph of habitus, illustration of male genitalia and key to Palearctic species of Cyrtotrachelus are also provided.