Cryptolechia modularis is a moth in the Depressariidae family. It was described by Meyrick in 1921. It is found on Java. The wingspan is about 24 mm. The forewings are light ochreous-brown, the costa is more ochreous, at the base suffused with dark fuscous. The stigmata is blackish, the plical somewhat beyond the first discal and there is an indistinct subterminal shade. There is a marginal series of small blackish dots around the posterior part of the costa and termen. The hindwings are grey.