Key to males of Caknesia

1 Face mainly yellowish; pygofer with bent extension on lower part of posterior margin ........................................................................................................................ C. glarusa

­ Face black or blackish brown; pygofer with bent extension on upper part of posterior margin (Figs 6, 14) ........................................................................................................ 2

2 Aedeagal shaft with apical processes (Fig. 15) ................................................. C. wajha

­ Aedeagal shaft with basal processes (Fig. 13) ........................................ C.sichuanensis