Ambulyx semiplacida Inoue, 1990, Tinea 12: 248. Type locality: Taiwan, Nantou Hsien, Lushan Spa, 1200m.
Similar to Ambulyx placida, but forewing upperside subterminal line more strongly arched and the yellow proximal border is broader; abdominal sternum 8 of the male is more strongly bilobed.
Taiwan: iii-iv (Nantou Hsien).
Taiwan: Nantou Hsien (Lushan Spa, 1200m; Hotso; Renluen, 1400m).
Endemic to Taiwan. The 'A. semiplacida' described from China (Yunnan (Kunming; Yanmen), Sichuan and Guangxi), and northeastern India (Assam), are A. regia.