Key to species of genus Kakuna (male)

1. Anal segment of male with processes (Figs 16, 17, 19); two processes of diaphragm very long, separated basally (Figs 19, 20); aedeagus in profile straight, without any process (Fig. 21); genital style in profile with apex subquadrate, apical margin truncate (Fig. 22) ......................................................................................... K. nonspinata sp. nov.

- Anal segment of male without process (Figs 5, 28, 30); two processes of diaphragm relatively short, both touching at base or with a common stalk basally (Figs 6, 31); aedeagus in profile curving dorsally, apical half with spine-like processes (Figs 8, 9, 32, 33); genital style tapering apically (Figs 10, 11, 34) ............................................................ 2

2. Aedeagus with two rows teeth along apical half of lateral margin (Figs 32, 33); inner margin of genital style with a nipple-like process medially (Figs 30, 34) ............................................................................... K. zhongtuana sp. nov.

- Aedeagus with several spine-like processes at apical part dorsally or ventrally (Figs 8, 9); genital style without process (Figs 10, 11) ......................................................................................................................................................... 3

3. Ventral margin of anal segment produced ventrally; pygofer in profile with laterodorsal angle not produced caudad; processes of diaphragm short; aedeagus not expanded at apex, apical part with five pairs of spine-like processes laterally; genital styles relatively broad and short ........................................................................... K. yushaniae (Yang)

- Ventral margin of anal segment not produced ventrally (Fig. 5); pygofer in profile with laterodorsal angle strongly produced caudad (Fig. 4); processes of diaphragm long (Fig. 6); aedeagus in profile distinctly expanded at apex, apical part with six spine-like processes (Fig. 8); genital styles relatively slender and long (Figs 5, 10, 11) .................. 4

4. Processes of diaphragm straight; aedeagus with three spine-like processes both dorsally and ventrally; suspensorium with stalk longer in middle line than broad ......................................................................... K. kuwayamai Matsumura

- Processes of diaphragm with apex curving laterad (Fig. 6); aedeagus with six spine-like processes apically on dorsal margin (Fig. 8); suspensorium with stalk shorter in middle line than broad (Fig. 7) ............................. K. lii sp. nov.