Key to the species of genus Sogana

1 Vertex with lateral areas between sublateral and lateral carinae distinctly depressed (Figs. 1–5, 7, 10, 13).....................................................................................................................................................................2

- Vertex with lateral areas between sublateral and lateral carinae weakly depressed or flat (Figs. 6, 16)....6

2 Fore wings with two middle anteapical cells equally long (Fig. 19; see Melichar, 1914: 115, Fig. 28)....3

- Fore wings with two middle anteapical cells not equally long (Figs. 21, 22)............................................5

3 Vertex with median carina approaching the level of eyes (see Fennah, 1978: 262, Fig. 220); fore wings with dark brown nebula apically (see Fennah, 1978: 262, Fig. 222) ........................... S. longiceps Fennah

- Vertex with median carina surpassing the level of eyes (Fig. 7; see Melichar, 1914: 115, Fig. 28); fore wings with brownish nebula apically (Fig. 22; see Melichar, 1914: 115, Fig. 28).....................................4

4 Vertex with anterior margin projected at an obtuse angle in dorsal view, the median spot at apex roundish (Figs. 7, 8); frons with median carina thick and wide (Fig. 8) .......................................... S. clara sp. nov.

- Vertex with anterior margin projected, nearly straight in dorsal view, the median spot at apex longish (see Melichar, 1914: 115; Fig. 28); frons with median carina thin and narrow (see Melichar, 1914: 115; Fig. 28) ................................................................................................................................. S. extrema Melichar

5 Vertex with median carina diverging medially; aedeagus with process arising from left side at apical fifth reaching to middle of aedeagus and having a distinct, sub-apical tooth directed dorsally and inwardly; the process arising from right side at apical third directed anterodorsally, with a stout sub-apical tooth directed dorsally and inwardly; endosomal process long and thin (Figs. 48, 49) ....................................................... .......................................................................................................................... S. pseudohopponis sp. nov.

- Vertex with median carina diverging basally; aedeagus with process arising from left side at apical fifth reaching approximately to base of aedeagus, and having 3–4 tiny sub-middle teeth directed ventrally and inwardly; the process arising from right side at apical third directed dorsally, with 2–3 fine spines; endosomal process short and thick (Figs. 46, 47) ............................................................... S. hopponis Matsumura

6 Vertex with lateral areas weakly depressed (see Melichar, 1914), sublateral carinae strongly curved outwards, almost approaching to lateral margin; fore wings without nebula apically .... S. stimulata Melichar

- Vertex with lateral areas flat (Figs. 6, 16), sublateral carinae nearly straight; fore wings with brownish nebula apically ...................................................................................................... S. robustocarina sp. nov.