Females
 

1. Female micropterous (A, B) . . . Gynochelys Brues

- Female apterous (a) or fully winged (b) . . . 2

 

2. Female fully winged (A, B) . . . 3

- Female apterous (a, b) . . . 6
 

3. Tibial spur formula 1/0/2, meta-tibia with two spurs (A) . . . Neodryinus R. Perkins

- Tibial spur formula 1/0/1, meta-tibia with a single spur (a) . . . 4

 

4. Notauli absent or hardly visible (then incomplete or complete) (A) . . . Adryinus Olmi

- Notauli clearly distinct and complete (a) . . . 5

 

5. Species small, with palpal formula variable from 3/2 to 4/2, or 5/2, or more rarely 5/3 or 6/3; protarsomere  5 with less than 15 lamellae (A, B) . . . Echthrodelphax R. Perkins

- Species large, with palpal formula 6/3; protarsomere  5 with more than 17 lamellae (a) . . . Gonatopus Ljungh partim

 

6. Maxillary/labial palpal formula 2/1 . . . Haplogonatopus R. Perkins
- Maxillary/labial palpal formula different . . . Gonatopus Ljungh partim

Males

1. Head with distinct complete occipital carina (A) . . . Echthrodelphax R. Perkins

- Head without occipital carina (a), or if with incomplete occipital carina, then carina only visible behind the lateral ocelli, and for a short distance to the sides of the lateral ocelli (b). . . 2
 

2. Temple absent (A) . . . Neodryinus R. Perkins

- Temple distinct (a) . . . 3

 

3. Maxillary/labial palpal formula 2/1 . . . Haplogonatopus R. Perkins

- Maxillary/labial palpal formula different . . . Gonatopus Ljungh