Cephennodes cavifrons species group

Two Himalayan species resemble members of the Cephennodes impressifrons group in the male secondary sexual modifications located on the head, but they have a strikingly different form of the aedeagus. The newly established C. cavifrons group is characterized by the posterior portion of frons in males with a median longitudinal carina, and the aedeagus in ventral view nearly symmetrical, drop-shaped, with subtriangular apices of median lobe and apical projection, both laying on the long axis of aedeagus; parameres slightly asymmetrical, one slightly shorter than the other. In the C. impressifrons group, the aedeagus is clearly asymmetrical and the apex of median lobe (if the median lobe has a defined apex instead of being truncate or broadly rounded) and the apex of apical projection do not lay together on the long axis of the aedeagus.

This group includes C. cavifrons and C. pampinosus described below.