| 1 | Mirror narrow | G . contractus |
| – | Mirror much broad | 2 |
| 2 | Forewings extended to tip of abdomen | G . dolichodens |
| – | Forewings not extended to tip of abdomen | 3 |
| 3 | Epistomal suture curved upward medially, frons with light angular patch | G . odonopetalus |
| – | Epistomal suture straight, frons uniform colored | G . extrarius |
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