A review of the subgenus Delineatia Volynkin & Huang, 2019 of the genus Ammatho Walker, 1855, with descriptions of two new species from Taiwan and Vietnam (Lepidoptera, Erebidae, Arctiinae, Lithosiini) Author Volynkin, Anton V. Altai State University, Lenina Avenue, 61, RF- 656049, Barnaul, Russia. & National Research Tomsk State University, Lenina Avenue, 36, RF- 634050, Tomsk, Russia Author Wu, Shipher Biodiversity Research Center, Academia Sinica, No. 128, Sec. 2, Academia Rd., Nangang Dist., Taipei City 11529, Taiwan. shipher @ gmail. com; https: // orcid. org / 0000 - 0003 - 2264 - 7238 text Zootaxa 2020 2020-06-18 4801 2 237 250 journal article 21639 10.11646/zootaxa.4801.2.2 a1540ced-2e09-452a-bd37-aee70242bf23 1175-5326 3900426 C8430970-E584-4B98-B515-38CD47ADA90E The A. sublucana species-group Diagnosis. The male genitalia of the species-group are characterized by the following characters: (1) the valva is only slightly broadened distally and has a nearly straight costal margin; (2) the medial costal process has a broad lobe-like base and a reduced tip; (3) the distal costal process is broadly trigonal or trapezoid and bears one or two short trigonal processes; (4) the sacculus has a uniform width and is narrowed at base of its distal process only, the dorsal margin of the broad part of sacculus is heavily setose; (5) the distal saccular process is short but robust, slightly curved dorsally; (6) the aedeagus is moderately long and narrow (shorter than in the A. delineata group). The female genitalia of the species-group are characterized by the very small postvaginal plate. Distribution . The species-group is distributed in Indochina.