Cautethia spuria (Boisduval, 1875)

Very similar to Cautethia yucatana but larger, forewings longer and apically more pointed. Forewing upperside very similar to Cautethia yucatana but dark bar at tornus more a broad triangular patch than a clearly defined stripe.

Male genialia: Uncus and gnathos larger than in the other Cautethia species; uncus slightly shorter then gnathos in lateral view, broader than in Cautethia grotei grotei and Cautethia noctuiformis noctuiformis, apex strongly convex, apical edge truncate-sinuate with the angle acute; gnathos large, apex divided and hollowed in a peculiar manner, divided into three lobes, one medial and ventral, short, sinuate-truncate, thin, acute in lateral view, the other two lobes rounded, incrassate, densely clothed with short spines.Harpe triangular, pointed but not projecting. Phallus with small apical dentate process, pointing distad.