414 Materials for a Monograph 



14. Last joint of tlie maxillary palpi of the same length as the penultimate 



Gryllus. 

 14. Last joint of the maxillarj' palpi double the length of the penultimate 



Nemobius. 



LoCUSTARIiE. 



15. Wingless, or with rudimentary wings and wing-covers .... 16 

 15. Winged 17 



16. Wingless ; pronotum not extended over meso- and metanotum . Ceuthophilus. 



16. With rudimentary wings and wing-covers ; pronotum extended 



over meso- and metanotura Thyreonotns. 



17. Wing-covers expanded in the middle 18 



17. Wing-covers not expanded in the middle 20 



18. Wing-covers much broadened in the middle, concave . . Crytophyllus. 



18. Wing-covers somewhat broadened in the middle, not concave . . .19 



19. Ovipositor very small Microcentrum. 



19. Ovipositor of medium size Phylloptera- 



20. Vertex of the head with a conical projection forwards . Conocephalus. 



20. Vertex of the head without a conical projection 21 



21. Ovipositor straight, or very nearly so; insect small . . Xiphidium. 

 21. Ovipositor curved; insect large 22 



22. Ovipositor curved sharply upwards Phaneroptera. 



22. Ovipositor ensiform Orchelimum. 



ACRYDII. 



23. Pronotum produced backwards, covering abdomen 31 



23. Pronotum not produced backwards over abdomen .... 24 



24. Antenna; broad and flattened at base, acuminate . . . Opomala. 



24. Antennas filiform, or slightly flattened 25 



25. Prosternum with a slender central spine 26 



25. Prosternum witliout a spine 28 



26. Sternal spine prominent 27 



26. Sternal spine but slightly raised Arcyptera. 



27. Lateral carina; of pronotum more or less prominent; medial carina scarcely 



elevated; extremity of abdomen of males much swollen . Caloptenug. 

 27. Lateral carinaj of pronotum wanting; medial carina generally prominent; 



extremity of abdomen in males not swollen . . . Acridium. 



28. Front, nearly perpendicular, generally swollen; vertex not prom- 

 inent G^dipoda. 



28. Front considerably oblique, sloping inwards; vertex prominent . . 29 

 29. Ilind-border of pronotum sharply angulated .... Tragocephala. 

 29. Hind-border of pronotum docked or rounded 30 



30. FoveoUc on the vertex; lateral carinie of pronotum incurved . Stenobothrus. 



30. No foveolae on the vertex ; lateral carinas of pronotum parallel or nearly 



so Chloi'.altis. 



31. Pronotum arched roundly Ratrachidea. 



31. Pronotum nearly or quite horizontal 32 



32. Antenuii; 13-14 jointed Tettix. 



32. Anteuutc 22 jointed Tettigidea. 



