Although the prominence of the white discal spot on the forewings varies among individuals, it is occasionally considered a key feature for identification.

A prominent characteristic of the forewings is the presence of discal spots, which are bold and white in nearly all the moths, except occasionally, where they are reduced in size, and less pronounced in color.

[3] Males contain a long and sharply pointed, setose uncus, a hook-like structure at the terminal end.

Their genital capsule is elliptical, while the 9th ventral segment, or the vinculum, contains a notable median suture, and relatively weak transtilla (band of connective tissue at the base of valvae) is present.

The anterior apophyses extends nearly two-thirds the length of the posterior ones, with the protruded sterigma being substantially unmodified.

Unlike other related species, C. subalba differs by lacking the sclerotized structures on the inner wall of corpus bursae, referred to as the signum.