Psittacastis argentata is a moth in the family Depressariidae.

The forewings are ferruginous with a whitish-grey ochreous streak from the costa near the base to a leaden spot above the dorsum at two-fifths, a greyish streak from the base along the fold to this.

There is also an oblique trapezoidal blue-leaden-metallic patch resting on the middle of the costa, one angle reaching two-thirds across the wing, the other projecting near the costa posteriorly.

There is an extremely fine very oblique leaden striga from the costa near beyond this to a very oblique blue-leaden striga in the disc at four-fifths, a blackish dash and some dark fuscous suffusion in the disc between this and the preceding patch, and some dark fuscous suffusion in the disc before the patch.

There is also a streak of leaden suffusion along the posterior fourth of the fold and a fine blackish line towards the apex, as well as two small spots of bluish suffusion transversely placed above the tornus.