Four new and one newly recorded species of Diduga Moore, [1887] (Lepidoptera, Erebidae, Arctiinae) from Vietnam, with redescription of the little known species Diduga haematomiformis van Eecke, 1920
Four new species, Diduga bayartogtokhi n. sp., D. nigridentata n. sp., D. quinquicornuta n. sp., and D. hanoiensis n. sp. are described from Vietnam along with one newly recorded species, D. alternota Bucsek, 2014. Moreover, adult, male and female genitalia of Diduga haematomiformis van Eecke, 1920 are illustrated for the first time. A key to the Vietnamese species of the genus Diduga, with illustrations of adults and genitalia of examined species are presented.