Two new species of the subgenus Conicornuta Volynkin, 2019 of the genus Ammatho Walker, 1855 are described: Ammatho (Conicornuta) sinocontinentalis Huang & Volynkin, sp. n. (China) and Ammatho (Conicornuta) mangae Volynkin, Huang & Derzhinsky, sp. n. (Vietnam, Vĩnh Phúc Province). The lectotype for Miltochrista convexa Wileman, 1910 is designated. Adults, male and female genitalia are illustrated.
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