Rhagastis rubetra
Diagnostic description:
Similar to Rhagastis acuta and Rhagastis velata but distinguishable from the first species by the forewing upperside ground colour and from the second by the shape of the labial palp segment 2. Labial palp segment 2 strongly narrowed towards the base (as in Rhagastis acuta). Forewing upperside similar to Rhagastis velata but ground colour ranging from pale grey to grey green ((olive-green in Rhagastis velata); the intensity of the dark markings varies considerably from almost absent to strongly present.
Male genitalia: Valve with 2-3 large stridulatory scales. Phallus without apical free processes, left side with an oblique row of small teeth.
Distribution:
A record from Vietnam remains to be confirmed.