Protambulyx euryalus
Diagnostic description:
Most similar to Protambulyx eurycles but: Forewing marginal band narrower between veins M1 and M2, even, not crenulated. Hindwing postmedial line curved not angled.
Male genitalia: Uncus with just a trace of a mesal lobe. Gnathos truncate, with angles strongly rounded. Valve with broad patch of stridulatory scales, at least three times as wide as long. Harpe with submedial process and edge more raised than in Protambulyx eurycles. Phallus longer than in Protambulyx eurycles, with non-dentate apical ridge.