Suborder Caelifera

1. Anterior legs modified for digging, male with cerci 2 segmented and tegmen with very reduced venation (comprising between 2 and 4 longitudinal veins).................................................................... Tridactylidae

- Anterior legs not modified for digging....................................................................3

2. Pronotum extending back over abdomen and without arolia on the tarsal claws............................. Tetrigidae

- Size 20–150 mm (most commonly 30–60 mm), pronotum not extended backwards.................................. 4

3. Antennae longer than anterior femora, fastigium lacking a medial longitudinal sulcus, posterior legs extended parallel to body during rest, tarsi of anterior and medial legs with 2 segments, body robust and eyes rounded................... Acrididae

- Antennae shorter than anterior femora, posterior legs extended perpendicular to body during rest, tarsi with 3 segments, body slender and elongated, and eyes large...................................................................... 5

4. Apterous or brachypterous species.............................................................. Eumastacidae

- Species with wings fully developed reaching the abdominal end........................................ Episactidae