Parameres of males a V. bui sp. nov., external view b V. bui sp. nov., perpendicular view c V. bui sp. nov., internal view d V. longiconnexiva, external view e V. longiconnexiva, perpendicular view f V. longiconnexiva, internal view g V. sinensis, external view h V. sinensis, perpendicular view i V. sinensis, internal view j V. tonkina, external view k V. tonkina, perpendicular view l V. tonkina, internal view. Scale bar: 0.2 mm.