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A. — Species of medium size; anal cerci much narrowed, but without a 

 notch. — M. femur-rubrum. 



(B). — Species of large size; anal cerci suddenly narrowed, making a 

 prominent right-angled notch on lower side — M. differentialis. 



Genera of the Tryxalinae. 



A. — Foveolae of Vertex present, and visible from above. Lateral 

 carinae of pronotum incurved — Stenobothrus . 

 S. curtipennis (Short-winged brown locust). 

 AA. — foveolae absent; lateral carinae nearly parallel — Chrysochraon. 

 C. cons per Slim (Sprinkled locust). 



Genera and Species of Oedipodinae. 

 A. — Wings with the disk yellow. 



B. — Apical half of wing dusky. 



C — Dorsal aspect of head with a slight median carina which is 

 quite prominent in the central foveola. — Encoptolophus 

 sordidiis (Clouded locust). 

 CC. — Dorsal aspect of head without median carina; central 

 foveola less distinct — Chortophaga viridifasciata (Green-, 

 striped locust). 

 BB. — With a dark band across the wings — Spharagemon aequale. 

 AA. — Wings with the disk black — Dissosteira Carolina (Carolina locust) 



Genera and Species of Locustidae. 



A. — Wingless or with rudimentary wings and wing covers. 



B. — Pronotum not extended over meso-and metanotum — Ceutho- 



philus. 

 BB. — Pronotum extended over meso-and metanotum — Thyreonotus. 

 AA. — Winged. 



B. — Tegmina expanded in the middle. 



C. — Tegmina much broadened in the middle, concave — Cyrto- 



phyllus. 

 CC. — Tegmina somewhat broadened in the middle, not concave. 

 D. — Ovipositor very small — Microcentrum. 

 DD. — Ovipositor of medium size — Amblycorypha. 

 BB. — Tegmina not expanded in the middle. 



C. — Vertex of the head with a conical projection forwards — 

 Conocephalus. 



