Abstract
Two closely related species of the genus Trisinus Raffray that exhibit exaggerated cephalic excavations are described: T. cavernosus Ding, Niu & Yin, sp. nov. from Tianmushan National Nature Reserve and T. qingliangmontis Ding, Niu & Yin, sp. nov. from Qingliangfeng National Nature Reserve. Detailed illustrations of the habitus and important diagnostic features are presented for both species to facilitate reliable identification. Based on the shared male characteristics, a new species group within Trisinus is termed and defined.
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