It is easy to distinguish the species of the genus Drepanodes from the other Phalænidæ, by their falcate or acutely produced primaries and their strong casual resemblance, both in size and ornamentation, to the Platypteryginæ (Drepana, Platypterix, Dryopteris), a subfamily of Bombycidæ This resemblance, while it has suggested to M. Guenée the generic name, is paralleled in the sub-order in different instances; but is here noteworthy as illustrating the synthetic relation which the great family Bombycidæ sustains to the other moths, The nearer affinities of Drepanodes in its family are with Chærodes.