We observed the antennal morphology and sensilla of the black-back prominent moth, C. anastomosis, by scanning electron microscopy (SEM). Antennae of both sexes of C. anastomosis are bipectinate, feather-like in shape, consisting of two basal segments, scape and pedicel, followed by a long distal flagellum with more than 30 segments, each having a pair of lateral branches. Twelve major sensillar types were identified: two types of sensilla trichodea (ST), two types of sensilla chaetica (SCh), three types of sensilla squamiformia (SSq), two types of sensilla basiconica (SB), two types of Böhm bristles (BB), sensilla coeloconica (SCo), sensilla auricillica (SA), sensilla styloconica (SSt), sensilla cavitata-peg (SCP), sensilla gemmiformia(SG), sensilla basiconic-mastoid (SBM) and sensilla cylindrica (CY). Sensilla cylindrica and sensilla gemmiformia only exist on female antennae, while sensilla basiconic-mastoid are only on male antennae. The morphology, number and distribution of various sensilla between two sexes were compared and their possible functions are discussed.