Theretra pallicosta
Immediately distinguishable from all other species of Theretra by the white forewing costa and discal spot, and a narrow white dorsal line restricted to the thorax. Opening at apex of labial palp segment 1 partly covered by single long scales from the first and second segments (as in Theretra castanea). Thorax with a white medial line. Forebasitarsus with external row of spines doubled and trebled. Forewing upperside purplish-brown with only serrate postmedial line clearly visible; discal spot a small white dot; costa highlighted with white. Hindwing upperside orange with a slightly darker, diffuse marginal band.
Male genitalia: Uncus weakly sinuate. Gnathos rather narrow, pointed.Valve with about 10 large stridulatory scales. Harpe long, slender, horizontal, apex rounded in dorsal view, flattened. Phallus with apical edge dorsally rounded-produced, symmetrical; on left and right sides are dentate processes pointing anteriorly, the left more slender and slightly longer than the right.