Rhagastis lambertoni
Diagnostic description:
Immediately distinguished from all other Rhagastis by the strongly convex outer margin and markedly falcate apex of the forewing. Labial palp segments 1 and 2 not contiguous; segment 2 not narrower than segment 1 and with a broad apical tuft on its inner surface. Male FWL: 22-30 mm.
Male genitalia: Uncus slightly longer than gnathos. Valves oval. Harpe elongate and hooked upward apically. Phallus with an oblique dorsal apical process that is notched on either side.