Polyptychus trilineatus
Very similar to Polyptychus chinensis and Polyptychus dentatus but distinguishable by the convex section to the submarginal line between M2 and CuA2. Forewing outer margin slightly to strongly crenulated. Forewing upperside ground colour varies from pale brown to purplish-grey.
Male genitalia: Uncus narrowing to a long, strong, acute hook, apex pointed, not emarginate as in Polyptychus dentatus. Gnathos a small fold. Transtillae with a pair of long, posteriorly-directed, needle-like processes. Juxta with two ventral processes medially fused to form a single fishtail-shaped process; dorso-lateral processes very unequal, right process long and pointed, projecting beyond middle of valve, left process short and apically rounded. Valve divided apically by a longitudinal slit; dorsal lobe rather weak, apically dilated and incurved; irregularly spatulate; ventral lobe with two incurved apical teeth, set close together ventral tooth slightly longer than dorsal tooth.
Female genitalia: Eighth tergite excavated, with a sharp prominent cone on the upper surface at each side directed posteriorly. Sterigma differs markedly in shape from Polyptychus dentatus, notably the lamella postvaginalis is much larger, distal margin slightly emarginate, medially somewhat produced and downcurved, so that it appears medially almost sinuate in posterior view, angles of lamella rounded.