Psittacastis cocae is a moth in the Depressariidae family. It was described by August Busck in 1931. It is found in Peru.
The wingspan is 11-12.5 mm. There is a light ochreous patch on the costal base of the forewings, extended in an oblique streak to the middle of the dorsum. The dorsal base is dark brown and at the costal third a broad, trapezoidal, bluish patch is terminated on the middle of the costa by two outwardly oblique, light yellow streaks. These reach nearly to the end of the cell and are separated by a narrow bluish metallic streak and are edged exteriorly with white scales on the costa. Beyond these streaks, the wing is rich brown with a blackish brown, longitudinal, central line before the apex and mottled with light ochreous. Below the trapezoidal costal patch is an elongate, oval, deep brown spot. The hindwings are dark lead colored.
The larvae feed on the leaves of Erythroxylon coca.