Theretra silhetensis
Diagnostic description:
Superficially similar to Theretra oldenlandiae oldenlandiae but immediately distinguishable by the single white dorsal abdominal line. Forewing upperside similar to Theretra oldenlandiae oldenlandiae; fourth postmedial line distinct, space between third and fourth postmedial lines silvery whereas that between fourth and fifth postmedial lines is beige and broader, fifth postmedial line thicker than sixth.
Male genitalia: Uncus less curved than in Theretra margarita, more strongly compressed apically. Gnathos ribbed along edges dorsally as in Theretra margarita, apical margin notched, less distinctly bisinuate. Phallus with processes narrower and longer than in Theretra margarita.
Distribution:
Records from Japan are of migrants or strays.