Four new species of the genus Diduga Moore, [1887] (Lepidoptera, Erebidae, Arctiinae) from China and Malaysia Author Zhao, Ting Ting School of Forestry, Northeast Forestry University, Harbin, 150040, China Author Han, Hui Lin School of Forestry, Northeast Forestry University, Harbin, 150040, China & Key Laboratory of Sustainable Forest Ecosystem Management-Ministry of Education, Northeast Forestry University, Harbin, 150040, China https://orcid.org/0000-0002-2045-6182 hanhuilin@aliyun.com text ZooKeys 2020 985 127 141 http://dx.doi.org/10.3897/zookeys.985.54047 journal article http://dx.doi.org/10.3897/zookeys.985.54047 1313-2970-985-127 3738FCE7C0A347DE87DF20C5637DE99B 8E8255B47E5857648BC34C7C9B40FEC9 Genus Diduga Moore, [1887] Diduga Moore, [1887]. The Lepidoptera of Ceylon 3 (4): 535. TS: Diduga costata Moore, [1887]. TL: Ceylon, [= Sri Lanka], Dickoya. = Androstigma Hampson, 1893. Illustrations of typical specimens of Lepidoptera Heterocera in the collection of the British Museum 9: 13, 82. TS: Diduga albicosta Hampson, 1891. TL: India, Nilgiri Plateau. Diagnosis. Species of Diduga are small in size. The proboscis is fully developed, the labial palpus is slender, directed upwards over the top of the head; the male antennae vary from ciliated to bipectinated. The tibial spurs are long. In the male abdomen, the 8th tergite is narrowed, with long and slender apodemes (Fig. 13 ); and the genitalia has narrow but long lateral hairpencils in many species. The configuration of valva may vary; usually they are simple, long, slender, and tapered, or short with several distinct processes, sometimes showing bilateral asymmetry. In the female genitalia, the ductus and corpus bursae range considerably in length. Most species have brown forewings with white or yellowish margins along the costa and distally, or forewings are medium brown with darker fasciae and stigmata. There are often various hairpencils and androconial tufts on the wings of males. In addition, the forewings have a complete set of veins arising from the cell, R1 to R3 all extending to the costal margin, R4 and R5 have a common stem, the others are independent. In the hindwing, RS and M1 have a common stem, M2 is absent, the others are independent ( Fang 2000 ; Holloway 2001 ).