Revision of the tropical African genus Tetraconcha (Orthoptera: Tettigoniidae: Phaneropterinae) with the description of ten new species

Tetraconcha smaragdina male (Central African Republic, N’Doki): 32. Stridulatory area (the arrow shows the distance between the base of left tegmen and the maximum width of cubital areas); 33. Stridulatory area of the holotype (Cameroon); 34. Stridulatory file below the left tegmen; 35. Cerci in dorsal view; 36. Subgenital plate in ventral view of the holotype. Tetraconcha loubesi sp. n. holotype male (Central African Republic, N’Doki): 37. Stridulatory area; 38. Stridulatory file below the left tegmen; 39. Cerci in dorsal view; 40. Subgenital plate in ventral view). Tetraconcha morettoi sp. n. holotype male (Central African Republic, N’Doki): 41. Stridulatory area; 42. Stridulatory file below the left tegmen; 43. Subgenital plate in ventral view; 44. Cerci in dorsal view. Tetraconcha ndokiensis sp. n. holotype male (Central African Republic, N’Doki): 45. Stridulatory area; 46. Stridulatory file below the left tegmen; 47. Subgenital plate and cerci in dorsal view; 48. Subgenital plate and cerci in ventral view.