Abstract
Updated distribution and keys to the males and females of all known Copera in Southeast Asia are provided with description of C. phanthanhhaii sp. nov. from Vietnam and Thailand (holotype ♂: Dong Hoi City, Quang Tri Province, Vietnam (17.379333°N, 106.482806°E, 163 m elevation). The new species differs from C. vittata (Selys, 1863) by having tibiae of middle and hind legs distinctly broadened in male and the shape of posterior process on the female’s prothorax.