Polyptychus chinensis Rothschild & Jordan, 1903, Novit. zool. 9 (suppl.): 239. Type locality: China: "probably Yangtse-kiang Region".
Wingspan: 92--112mm. Similar to Polyptychus dentatus in that the forewing submarginal line is not convex between veins M2 and Cu2, but forewings relatively broader and outer margin straighter.
In the female genitalia, eighth tergite (A8) a very large, deeply divided, irregularly notched and rugose plate, differing markedly from Polyptychus dentatus and Polyptychus trilineatus trilineatus. Lamella postvaginalis excavated to form a pair of rounded lobes.
Taiwan: iii-iv (Kaohsiung Hsien); iv (Hualien Hsien). Japan: 19.iv (Ryukyu Archipelago).
Larval hostplants. Ehretia dicksonii (Boraginaceae), a small tree (ShenHorn Yen, pers. comm. 2012).
Taiwan: Kaohsiung Hsien (Shanping, 640m).
Japan: Ryukyu Archipelago (Amami-Oshima).
Probably endemic to Taiwan and the southern Ryukyu Archipelago, contrary to what the type locality indicates.