Abstract
A new winter stonefly species of the genus Capnia Pictet, 1841, Capnia s.l. bilobata sp. nov. is described and illustrated from Shaanxi Province of northwestern China. The new species is distinguished from all currently known Capnia s.l. by the male and female genitalic characters. The falciform projection on male tergum 9 and the unique-shaped female subgenital plate separate the new taxon from other congeners.
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