Very similar to H. perforata,
they are also black and cobalt-bluish marking damselflies. Their wings are
narrow like H. perforata but the
iridescent areas on the wings are broader. Males of the species are distinct by
markings on the synthorax and the abdomen. The abdomen of male is stouter than
it of H. perforata, with distinct
blue markings on lateral side of each segment. Females have no valuable in
identification of the species. Their habitats, territorial and courtship
behaviours are very similar to it of H.
perforata, but H. b. biforata prefer opened running waters. They are widespread species but
distribute locally.
Young male, photographed by Cuong Do, Quang Binh
Thorax marking of full mature male, photographed by Cuong Do, Phu Yen
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